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<section id="locsat">
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<span id="global-locsat"></span><h1>LOCSAT<a class="headerlink" href="#locsat" title="Permalink to this heading">¶</a></h1>
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<p>Locator in SeisComP for computing source time and hypocenter
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coordinates from phase picks.</p>
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<section id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading">¶</a></h2>
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<p>LOCSAT is a locator with a travel-time interface in <cite>SeisComP</cite> for computing
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source time and hypocenter coordinates from phase picks considering:</p>
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<ul class="simple">
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<li><p>Pick time and pick uncertainty,</p></li>
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<li><p>Backazimuth and backazimuth uncertainty,</p></li>
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<li><p>Slowness and slowness uncertainty,</p></li>
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<li><p>Phase-specfic travel-time tables.</p></li>
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</ul>
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<p>The LOCSAT <a class="reference internal" href="#locsat-li"><span class="std std-ref">locator interface</span></a> implements a wrapper for the
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LocSAT locator by <span id="id1">Bratt and Nagy [<a class="reference internal" href="../base/references.html#id21" title="S.R. Bratt and W. Nagy. The LocSAT Program. Science Applications International Corporation (SAIC), San Diego, 1991.">42</a>]</span> (according to the README file shipped
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with the LocSAT distribution) referred to as <strong>LOCSAT</strong> in <cite>SeisComP</cite>. The LOCSAT
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<a class="reference internal" href="#locsat-tti"><span class="std std-ref">travel-time interface</span></a> provides travel time for specfic
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phases, epicentral distance, soure depth and station elevation.</p>
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</section>
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<section id="locator-interface">
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<span id="locsat-li"></span><h2>Locator Interface<a class="headerlink" href="#locator-interface" title="Permalink to this heading">¶</a></h2>
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<p>LOCSAT provides the hypocenter parameters through the locator interface.</p>
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</section>
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<section id="travel-time-interface">
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<span id="locsat-tti"></span><h2>Travel-Time Interface<a class="headerlink" href="#travel-time-interface" title="Permalink to this heading">¶</a></h2>
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<p>LOCSAT provides an interface for computing travel times based on coordinates and
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depth. The times are plotted on waveforms, e.g., blue marks in
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<a class="reference internal" href="scolv.html#scolv-sec-waveform-review"><span class="std std-ref">scolv picker window</span></a>.</p>
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<p>Use “LOCSAT” as a value for the travel-time interface when configurable, e.g.,
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by <a class="reference internal" href="global_fixedhypocenter.html#global-fixedhypocenter"><span class="std std-ref">FixedHypocenter</span></a>.</p>
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</section>
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<section id="travel-time-tables">
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<span id="locsat-ttt"></span><h2>Travel-Time Tables<a class="headerlink" href="#travel-time-tables" title="Permalink to this heading">¶</a></h2>
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<p><cite>SeisComP</cite> ships with two sets of predefined travel-time tables which are
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made available as the profiles tab and iasp91.</p>
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<p>The default profile is <em>iasp91</em>.</p>
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<p>LOCSAT travel time tables are located as plain ascii files under
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<code class="file docutils literal notranslate"><span class="pre">@DATADIR@/locsat/tables/</span></code>.
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The tables provide the travel times for particular seismic phases at
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given depth and epicentral distance in one file per Earth model and seismic
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phase. E.g. P-wave arrival times in the iasp91 model are found in
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<code class="file docutils literal notranslate"><span class="pre">@DATADIR@/locsat/tables/iasp91.P</span></code>. You may easily add your own tables
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for any available Earth model and seismic phase by adopting existing ones in new
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files which are added by <a class="reference internal" href="#locsat-station-application"><span class="std std-ref">configuration</span></a> to
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your <cite>SeisComP</cite> modules.</p>
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<section id="limitations">
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<h3>Limitations<a class="headerlink" href="#limitations" title="Permalink to this heading">¶</a></h3>
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<ol class="arabic">
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<li><p>Only phases for which a travel-time table exists can be considered.</p></li>
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<li><p>LOCSAT currently considers travel-time tables for phases which are hard-coded</p>
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<ul>
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<li><p>seismic body waves: P, Pg, Pb, Pn, Rg, pP, sP, PKP, PP, PKPab, PKPbc, PKPdf,
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SKPdf, PcP,
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S, Sg, Sb, Sn, Lg, SKS, SS, ScS,</p>
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<p>where P and S are the direct P and S phases, respectively, at all distances
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no matter the take-off angle at the source.</p>
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</li>
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<li><p>seismic surface waves: LQ, LR.</p></li>
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<li><p>infrasound: Is, It, Iw.</p></li>
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</ul>
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</li>
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<li><p>The maximum number of distance and depth intervals per table file is
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currently 210 and 50, respectively.</p>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<ul class="simple">
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<li><p>Travel-time tables with larger numbers of distance or depth samples are
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reported along with command-line error output (stderr). The travel-time
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tables should therefore be tested, e.g., with <a class="reference internal" href="scolv.html#scolv"><span class="std std-ref">scolv</span></a> before
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unsupervised application.</p></li>
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<li><p>Travel times at distance and depth samples exceeding the limits are
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ignored. This may lead to undesired behavior during location.</p></li>
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<li><p>Phase picks observed outside the distance and depth ranges defined by
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travel-time tables may lead to undesired behavior during location.</p></li>
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</ul>
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</div>
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</li>
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<li><p>The considered minimum depth is 0 km. Elevations and depths above datum are
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not natively considered. The effects of station elevation can be
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<a class="reference internal" href="#locsat-station-elevation"><span class="std std-ref">corrected for empirically</span></a>.</p></li>
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</ol>
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</section>
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<section id="station-elevations">
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<span id="locsat-station-elevation"></span><h3>Station elevations<a class="headerlink" href="#station-elevations" title="Permalink to this heading">¶</a></h3>
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<p>LOCSAT does not natively support corrections of travel-time tables for station
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elevations. At least checking the code:</p>
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<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">sta_cor</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.0</span><span class="p">;</span><span class="w"> </span><span class="cm">/* FIX !!!!!!*/</span>
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</pre></div>
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</div>
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<p>However, the <cite>SeisComP</cite> wrapper adds this feature. It allows to define a
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<code class="file docutils literal notranslate"><span class="pre">.stacor</span></code> file which defines emperic corrections of observed travel times.
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The corrections are provided in seconds and <strong>subtracted</strong> (not added) from
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the observation time to be compatible with the NonLinLoc <span id="id2">[<a class="reference internal" href="../base/references.html#id171" title="A. Lomax. The NonLinLoc Software Guide. Manual. URL: http://alomax.free.fr/nlloc/.">52</a>]</span>
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station correction definitions.</p>
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<p>Each LOCSAT profile (travel time table) can have one associated station
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correction file. E.g. for adding station corrections to the iasp91 tables, the
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file <code class="file docutils literal notranslate"><span class="pre">$SEISCOMP_ROOT/share/locsat/tables/iasp91.stacor</span></code> needs to be created.</p>
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<p>A station correction table takes the form:</p>
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<div class="highlight-params notranslate"><div class="highlight"><pre><span></span># LOCDELAY code phase numReadings delay
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LOCDELAY GE.MORC P 1 -0.1
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</pre></div>
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</div>
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<p>with</p>
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<ul class="simple">
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<li><p><strong>code</strong> (<em>string</em>) station code (after all alias evaluations)</p></li>
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<li><p><strong>phase</strong> (<em>string</em>) phase type (any of the available travel time tables)</p></li>
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<li><p><strong>numReadings</strong> (<em>integer</em>) number of residuals used to calculate mean residual/delay
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(not used by NLLoc, included for compatibility with the format of a summary,
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phase statistics file)</p></li>
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<li><p><strong>delay</strong> (<em>float</em>) delay in seconds, subtracted from observed time</p></li>
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</ul>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>The fourth column (numReadings) is ignored and just provided for compatibility
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reasons with <a class="reference internal" href="global_nonlinloc.html#global-nonlinloc"><span class="std std-ref">NonLinLoc</span></a>.</p>
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</div>
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</section>
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</section>
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<section id="application-and-setup">
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<span id="locsat-station-application"></span><h2>Application and Setup<a class="headerlink" href="#application-and-setup" title="Permalink to this heading">¶</a></h2>
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<p>LOCSAT is the default and only locator for <a class="reference internal" href="scautoloc.html#scautoloc"><span class="std std-ref">scautoloc</span></a> with <em>iasp91</em> as the
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default profile. However, LOCSAT can be used optionally in other modules such as
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<a class="reference internal" href="scolv.html#scolv"><span class="std std-ref">scolv</span></a> or <a class="reference internal" href="screloc.html#screloc"><span class="std std-ref">screloc</span></a>.</p>
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<section id="custom-travel-time-tables">
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<span id="locsat-custom-ttt"></span><h3>Custom travel-time tables<a class="headerlink" href="#custom-travel-time-tables" title="Permalink to this heading">¶</a></h3>
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<ol class="arabic">
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<li><p>Generate your travel-time tables from a custom Earth model, depth and
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distance intervals. Use the same format as the defaults as the <em>iasp91</em>
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tables. Tools such as <span id="id3"><em>TauP</em> [<a class="reference internal" href="../base/references.html#id274" title="TauP. Toolkit for seismic travel times. URL: https://www.seis.sc.edu/taup/.">25</a>]</span> allow the generation.</p></li>
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<li><p>Add your custom travel-time tables along with station corrections to
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<code class="file docutils literal notranslate"><span class="pre">@DATADIR@/locsat/tables/</span></code></p></li>
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<li><p>Add your available custom LOCSAT travel-time tables in global configuration,
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e.g., to the list of tables of travel-time interfaces</p>
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<div class="highlight-params notranslate"><div class="highlight"><pre><span></span>ttt.LOCSAT.tables = iasp91, tab, custom
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</pre></div>
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</div>
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<p>and to the list of locator profiles</p>
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<div class="highlight-params notranslate"><div class="highlight"><pre><span></span>LOCSAT.profiles = iasp91, tab, custom
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</pre></div>
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</div>
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<p>and optionally to locators which make use of LOCSAT tables, e.g.,
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<a class="reference internal" href="global_fixedhypocenter.html#global-fixedhypocenter"><span class="std std-ref">FixedHypocenter</span></a>.</p>
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</li>
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</ol>
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</section>
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<section id="application-with-modules">
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<h3>Application with modules<a class="headerlink" href="#application-with-modules" title="Permalink to this heading">¶</a></h3>
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<p>Additional parameters of LOCSAT may be configured in global module configuration
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(<code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.*</span></code>).</p>
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<ul class="simple">
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<li><p>The profiles for locating may be extended or limited by
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<a class="reference internal" href="#confval-LOCSAT.profiles"><code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.profiles</span></code></a>.</p></li>
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<li><p>When using picks with time uncertainties, consider
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<a class="reference internal" href="#confval-LOCSAT.usePickUncertainties"><code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.usePickUncertainties</span></code></a> and <a class="reference internal" href="#confval-LOCSAT.defaultTimeError"><code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.defaultTimeError</span></code></a>.</p></li>
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<li><p>Measurements of backazimuth and slowness may be deactivated by
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<code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.useBackazimuth</span></code> and <code class="xref std std-confval docutils literal notranslate"><span class="pre">LOCSAT.useSlownewss</span></code>, respectively.
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Such measurements may be obtained from array processing or from feature
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extraction using <a class="reference internal" href="scautopick.html#scautopick"><span class="std std-ref">scautopick</span></a>.</p></li>
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</ul>
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<p>You may also configure some <cite>SeisComP</cite> modules with LOCSAT and a profile.</p>
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<ul class="simple">
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<li><p><a class="reference internal" href="scautoloc.html#scautoloc"><span class="std std-ref">scautoloc</span></a>: Configure a profile for automatic locations,</p></li>
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<li><p><a class="reference internal" href="screloc.html#screloc"><span class="std std-ref">screloc</span></a>: Configure <em>LOCSAT</em> along with a profile for automatically
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relocating.</p></li>
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<li><p><a class="reference internal" href="scolv.html#scolv"><span class="std std-ref">scolv</span></a>: Configure <em>LOCSAT</em> along with a profile as defaults for
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interactive locations.</p></li>
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</ul>
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<p>When using LOCSAT in <a class="reference internal" href="scolv.html#scolv"><span class="std std-ref">scolv</span></a> you may interactively some settings. The
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changes only apply during runtime.</p>
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<figure class="align-center" id="id4">
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<a class="reference internal image-reference" href="../_images/scolv-locsat-settings.png"><img alt="../_images/scolv-locsat-settings.png" src="../_images/scolv-locsat-settings.png" style="width: 10cm;" /></a>
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<figcaption>
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<p><span class="caption-text">scolv Location tab with LOCSAT selected and the settings menu.</span><a class="headerlink" href="#id4" title="Permalink to this image">¶</a></p>
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</figcaption>
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</figure>
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</section>
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</section>
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<section id="module-configuration">
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<span id="global-locsat-configuration"></span><h2>Module Configuration<a class="headerlink" href="#module-configuration" title="Permalink to this heading">¶</a></h2>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p><strong>LOCSAT.*</strong>
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<em>Locator parameters: LOCSAT</em></p>
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</div>
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<dl class="std confval">
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<dt class="sig sig-object std" id="confval-LOCSAT.profiles">
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<span class="sig-name descname"><span class="pre">LOCSAT.profiles</span></span><a class="headerlink" href="#confval-LOCSAT.profiles" title="Permalink to this definition">¶</a></dt>
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<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">iasp91,</span> <span class="pre">tab</span></code></p>
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<p>Type: <em>list:string</em></p>
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<p>Defines a list of available LOCSAT travel-time tables.</p>
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</dd></dl>
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<dl class="std confval">
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<dt class="sig sig-object std" id="confval-LOCSAT.depthInit">
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<span class="sig-name descname"><span class="pre">LOCSAT.depthInit</span></span><a class="headerlink" href="#confval-LOCSAT.depthInit" title="Permalink to this definition">¶</a></dt>
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<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">20.0</span></code></p>
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<p>Type: <em>double</em></p>
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<p>Unit: <em>km</em></p>
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<p>The initial depth estimate for LOCSAT.</p>
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</dd></dl>
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<dl class="std confval">
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<dt class="sig sig-object std" id="confval-LOCSAT.usePickUncertainties">
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<span class="sig-name descname"><span class="pre">LOCSAT.usePickUncertainties</span></span><a class="headerlink" href="#confval-LOCSAT.usePickUncertainties" title="Permalink to this definition">¶</a></dt>
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<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">false</span></code></p>
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<p>Type: <em>boolean</em></p>
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<p>Whether to use pick time untertainties for arrival deltim rather
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than a fixed time error. If true then the uncertainties are
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retrieved from each individual pick object. If they are not
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defined then the default pick time uncertainty will be used
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as fallback.</p>
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</dd></dl>
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<dl class="std confval">
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<dt class="sig sig-object std" id="confval-LOCSAT.defaultTimeError">
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<span class="sig-name descname"><span class="pre">LOCSAT.defaultTimeError</span></span><a class="headerlink" href="#confval-LOCSAT.defaultTimeError" title="Permalink to this definition">¶</a></dt>
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<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">1.0</span></code></p>
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<p>Type: <em>double</em></p>
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<p>Unit: <em>s</em></p>
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<p>The default pick time uncertainty assigned to LOCSAT’s arrival deltim
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attribute if pick uncertainties are not going to be used or
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if they are absent. A time uncertainty of 0 s may result in
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errors of the SVD decomposition in LOCSAT.</p>
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</dd></dl>
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<dl class="std confval">
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<dt class="sig sig-object std" id="confval-LOCSAT.usePickBackazimuth">
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<span class="sig-name descname"><span class="pre">LOCSAT.usePickBackazimuth</span></span><a class="headerlink" href="#confval-LOCSAT.usePickBackazimuth" title="Permalink to this definition">¶</a></dt>
|
||
<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">true</span></code></p>
|
||
<p>Type: <em>boolean</em></p>
|
||
<p>Whether to forward pick backazimuth to LOCSAT or not. In an
|
||
automatic mode backazimuth measurements might be inaccurrate
|
||
and disabling their usage in LOCSAT can be controlled with
|
||
this parameter.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="std confval">
|
||
<dt class="sig sig-object std" id="confval-LOCSAT.usePickSlowness">
|
||
<span class="sig-name descname"><span class="pre">LOCSAT.usePickSlowness</span></span><a class="headerlink" href="#confval-LOCSAT.usePickSlowness" title="Permalink to this definition">¶</a></dt>
|
||
<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">true</span></code></p>
|
||
<p>Type: <em>boolean</em></p>
|
||
<p>Whether to forward pick horizontal slowness to LOCSAT or not.
|
||
In an automatic mode slowness measurements might be
|
||
inaccurrate and disabling their usage in LOCSAT can be
|
||
controlled with this parameter.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="std confval">
|
||
<dt class="sig sig-object std" id="confval-LOCSAT.degreesOfFreedom">
|
||
<span class="sig-name descname"><span class="pre">LOCSAT.degreesOfFreedom</span></span><a class="headerlink" href="#confval-LOCSAT.degreesOfFreedom" title="Permalink to this definition">¶</a></dt>
|
||
<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">9999</span></code></p>
|
||
<p>Type: <em>int</em></p>
|
||
<p>Number of degrees of freedom.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="std confval">
|
||
<dt class="sig sig-object std" id="confval-LOCSAT.confLevel">
|
||
<span class="sig-name descname"><span class="pre">LOCSAT.confLevel</span></span><a class="headerlink" href="#confval-LOCSAT.confLevel" title="Permalink to this definition">¶</a></dt>
|
||
<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">0.9</span></code></p>
|
||
<p>Type: <em>double</em></p>
|
||
<p>Confidence level between 0.5 and 1.0.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="std confval">
|
||
<dt class="sig sig-object std" id="confval-LOCSAT.enableConfidenceEllipsoid">
|
||
<span class="sig-name descname"><span class="pre">LOCSAT.enableConfidenceEllipsoid</span></span><a class="headerlink" href="#confval-LOCSAT.enableConfidenceEllipsoid" title="Permalink to this definition">¶</a></dt>
|
||
<dd><p>Default: <code class="docutils literal notranslate"><span class="pre">false</span></code></p>
|
||
<p>Type: <em>boolean</em></p>
|
||
<p>Compute the confidence ellipsoid from covariance matrix in 3D.</p>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
</section>
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<h3><a href="../index.html">Table of Contents</a></h3>
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<ul>
|
||
<li><a class="reference internal" href="#">LOCSAT</a><ul>
|
||
<li><a class="reference internal" href="#description">Description</a></li>
|
||
<li><a class="reference internal" href="#locator-interface">Locator Interface</a></li>
|
||
<li><a class="reference internal" href="#travel-time-interface">Travel-Time Interface</a></li>
|
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<li><a class="reference internal" href="#travel-time-tables">Travel-Time Tables</a><ul>
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<li><a class="reference internal" href="#limitations">Limitations</a></li>
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<li><a class="reference internal" href="#station-elevations">Station elevations</a></li>
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</ul>
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</li>
|
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<li><a class="reference internal" href="#application-and-setup">Application and Setup</a><ul>
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<li><a class="reference internal" href="#custom-travel-time-tables">Custom travel-time tables</a></li>
|
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<li><a class="reference internal" href="#application-with-modules">Application with modules</a></li>
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</ul>
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</li>
|
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<li><a class="reference internal" href="#module-configuration">Module Configuration</a></li>
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</ul>
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</li>
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</ul>
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