202 lines
9.1 KiB
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202 lines
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HTML
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<span class="version">6.9.1</span>
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<section id="mb-idc">
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<span id="global-mb-idc"></span><h1>mb_IDC<a class="headerlink" href="#mb-idc" title="Permalink to this heading">¶</a></h1>
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<p>Body wave magnitude computed at CTBTO/IDC (mb) is calculated for seismic
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events from the time-defining primary body waves recorded at seismic
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stations at an epicentral distance between 20 and 105 degrees
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from the event.</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 A5/2 amplitudes are calculated on the vertical component seismograms filtered
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between 0.8 and 4.5 Hz and converted to displacement.</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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<div class="math">
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<p><img src="../_images/math/be87b4ff8e5530b3bf22b3e2f2d2f23b57c93bf4.png" alt="mag = \log10(\frac{A}{T}) + Q(\Delta,h)"/></p>
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</div><p>with</p>
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<p>A: amplitude of type A5/2</p>
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<p>T: period of the signal in seconds</p>
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<p>Q: attenuation correction function of event distance and event depth</p>
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<p>h: event depth in km</p>
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<p>The attenuation corrections as a function of distance and depth are based on
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(Veith, K. F., and Clawson, G. E., 1972). The corrections are tabulated every
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degree for distances out to 180 degrees and for depths 0, 15, 40 km, and
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100-800 km in steps of 100 km. Bi-cubic splines were used for interpolating the
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tables. The tabulated values were adjusted for the fact that the original
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(Veith, K. F., and Clawson, G. E., 1972) tables relate to peak-to-peak
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amplitudes, whereas the measured amplitudes for mb calculations are half
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peak-to-peak. The default corrections are read from a file installed at
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<code class="file docutils literal notranslate"><span class="pre">@DATADIR@/magnitudes/IDC/qfvc.mb</span></code>.If that file is not present no magnitude
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will be calculated.</p>
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</section>
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<section id="station-corrections">
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<h3>Station corrections<a class="headerlink" href="#station-corrections" title="Permalink to this heading">¶</a></h3>
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<p>Station magnitudes can be computed with a station specific correction table
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which is configured in the global bindings. The parameter <a class="reference internal" href="global.html#confval-magnitudes.mb-IDC-.Q"><code class="xref std std-confval docutils literal notranslate"><span class="pre">magnitudes.mb(IDC).Q</span></code></a>
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takes a path and allows to use placeholders for network code (<code class="code docutils literal notranslate"><span class="pre">{net}</span></code>),
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station code (<code class="code docutils literal notranslate"><span class="pre">{sta}</span></code>) and location code (<code class="code docutils literal notranslate"><span class="pre">{loc}</span></code>).</p>
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<p>Example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">magnitudes</span><span class="o">.</span><span class="n">mb</span><span class="p">(</span><span class="n">IDC</span><span class="p">)</span><span class="o">.</span><span class="n">Q</span> <span class="o">=</span> <span class="nd">@DATADIR</span><span class="o">@/</span><span class="n">magnitudes</span><span class="o">/</span><span class="n">IDC</span><span class="o">/</span><span class="p">{</span><span class="n">net</span><span class="p">}</span><span class="o">.</span><span class="p">{</span><span class="n">sta</span><span class="p">}</span><span class="o">.</span><span class="n">mb</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>Amplitude unit in SeisComP: <strong>nanometer</strong> (nm)</p></li>
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<li><p>Time window: 5.5 s</p></li>
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<li><p>Default distance range: 20 - 105 deg</p></li>
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<li><p>Depth range: 0 - 800 km</p></li>
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</ul>
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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="#">mb_IDC</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="#station-corrections">Station corrections</a></li>
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