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<span class="title">scanloc: Phase Associator </span>
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<span class="version">2025.295#8bb1059a0</span></h1>
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<section id="advanced-s-phase-detector">
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<span id="scanloc-spicker"></span><h1>Advanced S-Phase Detector<a class="headerlink" href="#advanced-s-phase-detector" title="Permalink to this heading">¶</a></h1>
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<p>The <a class="reference internal" href="../apps/scanloc.html#scanloc"><span class="std std-ref">scanloc</span></a> package provides the enhanced S-phase detectors,
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S-AIC and S-AIC-V, as well as the <a class="reference internal" href="#scanloc-spick-debugger"><span class="std std-ref">debugger</span></a>.</p>
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<section id="overview">
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<h2>Overview<a class="headerlink" href="#overview" title="Permalink to this heading">¶</a></h2>
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<p>The <em>scanloc</em> package includes two S phase pickers: S-AIC and S-AIC-V, enhancing the
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performance of the picker with respect to the OpenSource S-L2. Both picker
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apply an AIC algorithm in order to detect S phases after a P pick was maked.
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Therefore S phases are only detected after a P detection.
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Using the S-AIC, S picks are determined on the vectorial sum of the horizontal
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componentes (L2 trace).
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The S-AIC-V works like the S-AIC but it picks S phases on the vertical component.</p>
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<p>The method which was applied to make the pick can be read</p>
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<ul class="simple">
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<li><p>In the method column of the arrival table in the Location tab of <span id="id1"><em>scolv</em> [<a class="reference internal" href="references.html#id268" title="scolv. SeisComP module. URL: https://docs.gempa.de/seiscomp/current/apps/scolv.html.">24</a>]</span>,</p></li>
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<li><p>In the picker window from the letter within brackets following a phase type,</p></li>
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<li><p>In the picker window from the hint which appears when hovering over a
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pick.</p></li>
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</ul>
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<figure class="align-center" id="id3">
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<span id="scanloc-fig-picker-method"></span><a class="reference internal image-reference" href="../_images/scolv-picker-method.png"><img alt="../_images/scolv-picker-method.png" src="../_images/scolv-picker-method.png" style="width: 10cm;" /></a>
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<figcaption>
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<p><span class="caption-text">Figure 43: Read the method applied to make a pick in the arrival table of scolv or in
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the picker window.</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p>
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</figcaption>
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</figure>
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<p>The performance of the pickers have been tested by comparison of automatic
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with manual picks (see the <a class="reference internal" href="#scanloc-fig-picker-comparison"><span class="std std-ref">Figure showing the comparison</span></a>).</p>
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<figure class="align-center" id="id4">
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<span id="scanloc-fig-picker-comparison"></span><a class="reference internal image-reference" href="../_images/hist_comp_vgt.png"><img alt="../_images/hist_comp_vgt.png" src="../_images/hist_comp_vgt.png" style="width: 10cm;" /></a>
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<figcaption>
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<p><span class="caption-text">Figure 44: Performance comparison showing the differences in pick time from manual picks
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and the optimally tuned pickers S-L2, S-AIC and S-AIC-V for local earthquakes
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in West-Bohemia/Vogtland. The area is typical of local earthquake monitored at
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short epicentral distances of a few tens of kilometers. The distribution of
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the differences in the automatic pick times with respect to the manual ones
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shows the increased performance using the S-AIC.</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 id="picker-configuration">
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<h2>Picker configuration<a class="headerlink" href="#picker-configuration" title="Permalink to this heading">¶</a></h2>
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<ol class="arabic">
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<li><p><strong>Global module parameters:</strong> Add the plugin <em>saic</em> to the configuration of
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<strong class="program">scautopick</strong> or the global
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module configuration for making use of the S-AIC or the S-AIC-V:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">plugins</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="si">${</span><span class="nv">plugins</span><span class="si">}</span>,saic
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</pre></div>
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</div>
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</li>
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<li><p><strong>Module parameters:</strong> Activate one of the S-phase ickers (S-L2, S-AIC, S-AIC-V)
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by changing the name of the S picker in the module
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configuration of <strong class="program">scautopick</strong>. Deactivating <em>killPendingSPickers</em> will allow
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to pick S phases even if more P phases were detected before:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">spicker</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"S-AIC"</span>
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<span class="nv">killPendingSPickers</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span>
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</pre></div>
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</div>
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</li>
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<li><p><strong>Bindings parameters:</strong> Configure the S-picker parameters under <em>spicker</em> in
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global section of the bindings of <strong class="program">scautopick</strong> e.g. for
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<em>S-AIC</em> in local earthquake monitoring. For tuning the values based on actual
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data you may use the <a class="reference internal" href="#scanloc-spick-debugger"><span class="std std-ref">graphical debugger</span></a>:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">detecFilter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"RMHP(10)>>ITAPER(30)>>BW(4,4,20)>>STALTA(0.2,20)"</span>
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<span class="nv">timeCorr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span>
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spicker.AIC.noiseBegin<span class="w"> </span><span class="o">=</span><span class="w"> </span>-10
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spicker.AIC.signalBegin<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span>.5
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spicker.AIC.filter<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"ITAPER(4)>>BW_HP(4,3)"</span>
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spicker.AIC.detecFilter<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">""</span>
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spicker.AIC.step<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span>.5
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spicker.AIC.minSNR<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">5</span>
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spicker.AIC.minCnt<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">5</span>
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</pre></div>
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</div>
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<p>The AIC parameters <em>spicker.AIC.</em> are used for <em>S-AIC</em> and for <em>S-AIC-V</em>.
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The parameters of the S-phase pickers can be configured in the global section of the
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bindings profile of <strong class="program">scautopick</strong>. The meaning of some parameters are shared
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between the S-phase pickers:</p>
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<table class="docutils align-default" id="scanloc-table-parameter">
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<colgroup>
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<col style="width: 15.0%" />
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<col style="width: 25.0%" />
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<col style="width: 60.0%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="head"><p>Parameter</p></th>
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<th class="head"><p>Picker type</p></th>
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<th class="head"><p>Description</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">noiseBegin</span></code></p></td>
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<td><p>S-AIC, S-AIC-V, S-L2</p></td>
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<td><p>Data window added before the p pick on order to compensate
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for effects due to the data processing, filtering and to compute the SNR.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">signalBegin</span></code></p></td>
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<td><p>S-AIC, S-AIC-V, S-L2</p></td>
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<td><p>Start of the data processing relative to the reference P pick.</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">signalEnd</span></code></p></td>
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<td><p>S-AIC, S-AIC-V, S-L2</p></td>
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<td><p>End of the data processing relative to the reference P pick.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">filter</span></code></p></td>
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<td><p>S-AIC, S-L2</p></td>
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<td><p>Filter applied before forming the L2 trace.</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">detectFilter</span></code></p></td>
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<td><p>S-AIC, S-AIC-V, S-L2</p></td>
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<td><p>Filter applied on the L2 trace before AIC analysis.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">step</span></code></p></td>
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<td><p>S-AIC, S-AIC-V</p></td>
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<td><p>Step size in which the time windows are enlarged.</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">minSNR</span></code></p></td>
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<td><p>S-AIC, S-AIC-V, S-L2</p></td>
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<td><p>Minimum SNR in order to accept a pick.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">minCnt</span></code></p></td>
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<td><p>S-AIC, S-AIC-V</p></td>
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<td><p>Minimum number the AIC minimum must be found for subsequent time windows.</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="xref std std-confval docutils literal notranslate"><span class="pre">uncertainty</span></code></p></td>
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<td><p>S-AIC, S-AIC-V</p></td>
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<td><p>Pick uncertainty. Unused by the picker but part of the output pick element.</p></td>
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</tr>
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</tbody>
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</table>
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</li>
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</ol>
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</section>
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<section id="picker-tuning-debugger">
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<span id="scanloc-spick-debugger"></span><h2>Picker tuning: Debugger<a class="headerlink" href="#picker-tuning-debugger" title="Permalink to this heading">¶</a></h2>
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<p>The <a class="reference internal" href="#scanloc-fig-debugger"><span class="std std-ref">debugger GUI</span></a> allows the graphics-assisted tuning
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of the S pickers, S-L2, S-AIC, S-AIC-V. In order to make use of the S picker
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debugging GUI:</p>
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<ol class="arabic">
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<li><p><strong>Global module parameters:</strong> Add the plugin <em>spickdbg</em> to the global
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configuration of <span id="id2"><em>scolv</em> [<a class="reference internal" href="references.html#id268" title="scolv. SeisComP module. URL: https://docs.gempa.de/seiscomp/current/apps/scolv.html.">24</a>]</span> (<code class="file docutils literal notranslate"><span class="pre">scolv.cfg</span></code>)</p>
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<div class="highlight-params notranslate"><div class="highlight"><pre><span></span>plugins = ${plugins}, spickdbg
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</pre></div>
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</div>
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</li>
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<li><p><strong>Global bindings:</strong> Configure the initial parameters in the global bindings
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of the considered stream. You may adopt parameters from the ones used by the
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<em>spicker</em> for a good inital guess.</p></li>
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</ol>
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<p>The debugger GUI can be started from the picker window of <strong class="program">scolv</strong>.
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If there is an existing P pick, the debugger window can be opened with a
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right click on the P pick. In the dropdown menu the S picker type can be chosen.</p>
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<figure class="align-center" id="id5">
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<span id="scanloc-fig-picker-debugger-menu"></span><a class="reference internal image-reference" href="../_images/scolv-picker-debugger-open.png"><img alt="../_images/scolv-picker-debugger-open.png" src="../_images/scolv-picker-debugger-open.png" style="width: 10cm;" /></a>
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<figcaption>
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<p><span class="caption-text">Figure 45: Selection of S-picker debugger by right-clicking on a P phase.</span><a class="headerlink" href="#id5" title="Permalink to this image">¶</a></p>
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</figcaption>
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</figure>
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<p>A new pop-up window opens where the P pick (red line) and the newly determined S
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pick (light blue line) are shown and the parameters can be tested.</p>
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<figure class="align-center" id="id6">
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<span id="scanloc-fig-debugger"></span><a class="reference internal image-reference" href="../_images/s-picker-debugger.png"><img alt="../_images/s-picker-debugger.png" src="../_images/s-picker-debugger.png" style="width: 10cm;" /></a>
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<figcaption>
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<p><span class="caption-text">Figure 46: S-picker debugger example showing the filtered horizontal traces, the
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computed L2 trace and the resulting S pick (light blue line).</span><a class="headerlink" href="#id6" title="Permalink to this image">¶</a></p>
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</figcaption>
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</figure>
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<p>The <a class="reference internal" href="#scanloc-fig-debugger"><span class="std std-ref">example above</span></a> shows the debugger GUI for a local
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earthquake:</p>
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<ul class="simple">
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<li><p><strong>Top traces:</strong> original filtered data.</p></li>
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<li><p><strong>Bottom trace:</strong> Resulting trace e.g. L2.</p></li>
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<li><p><strong>First red line:</strong> the time of the referenced pick. A pick pick should be selected.</p></li>
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<li><p><strong>Additional phase picks</strong> are shown on top of the data.</p></li>
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<li><p><strong>Light blue line:</strong> the S pick which would be made based on the selected
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parameters. The number next to ‘AIC’ indicates the SNR.</p></li>
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<li><p><strong>Lower section:</strong> Parameters which can be adjusted.</p></li>
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</ul>
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<p>The initial parameters are read from the global binding configuration from the
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selected stream. Change the parameters to find the optimum
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values. Click on the <em>Update</em> button to apply them in the GUI.
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In order to make use of the tested parameters their values must be configured in
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the bindings parameter of <strong class="program">scautopick</strong> or the respective alias.</p>
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<table class="docutils align-default" id="scanloc-debugger-parameters">
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<colgroup>
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<col style="width: 15.0%" />
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<col style="width: 85.0%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="head"><p>Parameter</p></th>
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<th class="head"><p>Description</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p>N</p></td>
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<td><p>Start of the noise window</p></td>
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</tr>
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<tr class="row-odd"><td><p>S0</p></td>
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<td><p>Start of the AIC window</p></td>
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</tr>
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<tr class="row-even"><td><p>S1</p></td>
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<td><p>End of the AIC window</p></td>
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</tr>
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<tr class="row-odd"><td><p>AIC0</p></td>
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<td><p>Start of the data processing relative to the reference P pick.</p></td>
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</tr>
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<tr class="row-even"><td><p>AIC</p></td>
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<td><p>S pick based on the current parameters with number indicating the SNR.</p></td>
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</tr>
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<tr class="row-odd"><td><p>AIC1</p></td>
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<td><p>End of the data processing when meeting MinSNR and MinCnt.</p></td>
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</tr>
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<tr class="row-even"><td><p>Pick</p></td>
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<td><p>Pick time at AIC.</p></td>
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</tr>
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</tbody>
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</table>
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</section>
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</section>
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<div>
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<h3><a href="../index.html">Table of Contents</a></h3>
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<ul>
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||
<li><a class="reference internal" href="#">Advanced S-Phase Detector</a><ul>
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||
<li><a class="reference internal" href="#overview">Overview</a></li>
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||
<li><a class="reference internal" href="#picker-configuration">Picker configuration</a></li>
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<li><a class="reference internal" href="#picker-tuning-debugger">Picker tuning: Debugger</a></li>
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</ul>
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</li>
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</ul>
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<div>
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<h4>Previous topic</h4>
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<p class="topless"><a href="locsat-tables.html"
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