[seiscomp, scanloc] Install, add .gitignore
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<!DOCTYPE html>
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<meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Ms_20 — SeisComP Release documentation</title>
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<span class="version">6.9.0</span>
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<section id="ms-20">
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<span id="global-ms-20"></span><h1>Ms_20<a class="headerlink" href="#ms-20" title="Permalink to this heading">¶</a></h1>
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<p>Surface wave magnitude measured at around 20 s</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>Ms_20 is the surface wave magnitude measured on the vertical component at around
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20 s period in accordance with the IASPEI standards.</p>
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<section id="amplitude">
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<h3>Amplitude<a class="headerlink" href="#amplitude" title="Permalink to this heading">¶</a></h3>
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<p>The Ms_20 amplitudes are calculated on vertical-component displacement seismograms
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corrected for the instrument response of a <a class="reference internal" href="../base/glossary.html#term-WWSSN_LP"><span class="xref std std-term">WWSSN_LP</span></a> seismograph.</p>
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</section>
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<section id="station-magnitude">
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<h3>Station Magnitude<a class="headerlink" href="#station-magnitude" title="Permalink to this heading">¶</a></h3>
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<p>Ms_20 is the surface-wave magnitude at 20 s period based on the recommendations
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by the IASPEI magnitude working group issued on 27 March, 2013 (<span id="id1">IASPEI [<a class="reference internal" href="../base/references.html#id40" title="IASPEI. Summary of magnitude working group recommendations on standard procedures for determining earthquake magnitudes from digital data. IASPEI Website, 2013. URL: http://www.iaspei.org/commissions/commission-on-seismological-observation-and-interpretation/Summary_WG_recommendations_20130327.pdf.">46</a>]</span>).</p>
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<div class="math">
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<p><img src="../_images/math/e09fa212079ab87241b0d94c484f2a485283c708.png" alt="M_s = \log \left(\frac{A}{T}\right) + 1.66 \log(\Delta) + 0.3"/></p>
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</div><p>with</p>
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<p>A: <a class="reference internal" href="../base/glossary.html#term-WWSSN_LP"><span class="xref std std-term">WWSSN_LP</span></a> corrected ground displacement in units of nm measured on the vertical-component
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seismogram as the maximum absolute trace amplitude of a surface wave at periods between
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18 s and 22 s,</p>
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<p>T: period of the surface wave in seconds.</p>
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<p>The term <em>Ms_20</em> is chosen in accordance with the IASPEI standard as of 2013 (<span id="id2">IASPEI [<a class="reference internal" href="../base/references.html#id40" title="IASPEI. Summary of magnitude working group recommendations on standard procedures for determining earthquake magnitudes from digital data. IASPEI Website, 2013. URL: http://www.iaspei.org/commissions/commission-on-seismological-observation-and-interpretation/Summary_WG_recommendations_20130327.pdf.">46</a>]</span>).
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Alternatively, the term <em>Ms(20)</em> may be used.</p>
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<ul class="simple">
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<li><p>Amplitude unit in <cite>SeisComP</cite>: <strong>nanometer</strong> (nm)</p></li>
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<li><p>Time window: 0 s - distance (km) / 3.5 km/s + 30 s</p></li>
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<li><p>Period range: 18 s - 22 s, configurable: <a class="reference internal" href="global.html#confval-magnitudes.Ms_20.lowerPeriod"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.Ms_20.lowerPeriod</span></code></a>,
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<a class="reference internal" href="global.html#confval-magnitudes.Ms_20.upperPeriod"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.Ms_20.upperPeriod</span></code></a></p></li>
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<li><p>Default distance range: 20 - 160 deg, configurable: <a class="reference internal" href="global.html#confval-magnitudes.Ms_20.minDist"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.Ms_20.minDist</span></code></a>,
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<a class="reference internal" href="global.html#confval-magnitudes.Ms_20.maxDist"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.Ms_20.maxDist</span></code></a></p></li>
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<li><p>Depth range: <= 100 km, configurable: <a class="reference internal" href="global.html#confval-magnitudes.Ms_20.maxDepth"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.Ms_20.maxDepth</span></code></a></p></li>
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</ul>
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</section>
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<section id="network-magnitude">
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<h3>Network magnitude<a class="headerlink" href="#network-magnitude" title="Permalink to this heading">¶</a></h3>
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<p>By default, the trimmed mean is calculated from the station magnitudes to form
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the <a class="reference internal" href="../base/glossary.html#term-network-magnitude"><span class="xref std std-term">network magnitude</span></a>. Outliers below the 12.5% and above the 12.5% percentiles are
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removed before the calculation.</p>
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</section>
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<section id="configuration">
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<h3>Configuration<a class="headerlink" href="#configuration" title="Permalink to this heading">¶</a></h3>
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<p>Adjust the configurable parameters in global bindings in the Ms_20 section. Add
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Ms_20 to the list of computed amplitudes and magnitudes in the configuration of
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<a class="reference internal" href="scamp.html#scamp"><span class="std std-ref">scamp</span></a> and <a class="reference internal" href="scmag.html#scmag"><span class="std std-ref">scmag</span></a> and in <a class="reference internal" href="scesv.html#scesv"><span class="std std-ref">scesv</span></a> or <a class="reference internal" href="scolv.html#scolv"><span class="std std-ref">scolv</span></a> for visibility.</p>
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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="#">Ms_20</a><ul>
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<li><a class="reference internal" href="#description">Description</a><ul>
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<li><a class="reference internal" href="#amplitude">Amplitude</a></li>
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<li><a class="reference internal" href="#station-magnitude">Station Magnitude</a></li>
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<li><a class="reference internal" href="#network-magnitude">Network magnitude</a></li>
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<li><a class="reference internal" href="#configuration">Configuration</a></li>
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