202 lines
8.7 KiB
HTML
202 lines
8.7 KiB
HTML
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<title>MLh — SeisComP Release documentation</title>
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<!-- span class="title">SeisComP Release</span -->
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<span class="version">6.9.0</span>
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<a href="../toc/extensions.html" >Extensions</a>
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<a href="../toc/extensions/global.html" accesskey="U">global</a>
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<section id="mlh">
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<span id="global-mlh"></span><h1>MLh<a class="headerlink" href="#mlh" title="Permalink to this heading">¶</a></h1>
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<p>The MLh plugin (previously MLsed) is designed to compute amplitudes
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and magnitudes according to the Swiss Seismological Service (SED)
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standards.</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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<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 MLh amplitude calculation is very similar to the original <a class="reference internal" href="global_ml.html#global-ml"><span class="std std-ref">ML</span></a>.
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The two differences are:</p>
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<ul class="simple">
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<li><p>It uses the maximum of the two horizontal components (average can be configured if necessary)</p></li>
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<li><p>It uses zero-to-peak in stead of peak-to-peak values</p></li>
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</ul>
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<p>Zero-to-peak is calculated by just dividing the peak-to-peak amplitude by two.
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This is not exact for unsymmetrical signals, but that doesn’t matter because the
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code actually generates zero-to-peak amplitudes internally and multiplies them
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with two. So in the end we get real zero-to-peak values.</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>The MLh plugin calculates the individual station magnitude using the following formula:</p>
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<div class="math">
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<p><img src="../_images/math/4cfbd65af2e9b33bf217b7f95d186fabbf6a6db7.png" alt="mag = \log10(waamp1) + A \times hypdistkm + B"/></p>
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</div><p>waampl is the amplitude produced by the MLh plugin. Hypdistkm is the distance
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from the sensor to the hypocenter in kilometers. A and B are parameters that
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can be configured in a config file. Several pairs of A and B can be configured
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for different ranges of hypocenter distance.</p>
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<ul class="simple">
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<li><p>Amplitude unit in SeisComP: <strong>millimeter</strong> (mm)</p></li>
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<li><p>Time window: 150 s by <a class="reference internal" href="scautopick.html#scautopick"><span class="std std-ref">scautopick</span></a> or distance dependent</p></li>
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<li><p>Distance range: 0 - 20 deg</p></li>
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<li><p>Depth range: 0 - 80 km</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>To compute the network magnitude from station magnitudes the SED standard is applied
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by computing the median value of all contributing station magnitudes without any trimming.</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>Add the <em>mlh</em> plugin to the existing plugins in the global configuration.
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Set the calibration parameters in the global bindings to compute MLh.
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There exist no default configuration. Add MLh to the list of
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amplitudes and magnitudes in the configuration of <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> for computation
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and in <a class="reference internal" href="scesv.html#scesv"><span class="std std-ref">scesv</span></a> for visibility.</p>
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</section>
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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="#">MLh</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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Version <b>6.9.0</b> Release
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Copyright © gempa GmbH, GFZ Potsdam.
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