185 lines
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185 lines
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HTML
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<!-- span class="title">SeisComP Release</span -->
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<span class="version">6.9.1</span>
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<section id="fx-dfx">
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<span id="global-fx-dfx"></span><h1>FX-DFX<a class="headerlink" href="#fx-dfx" title="Permalink to this heading">¶</a></h1>
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<p>Implementation of the CTBTO/IDC polarization analysis for
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three-component stations.</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>The feature extraction as implemented at CTBTO IDC for single three-component
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stations determines back azimuth (station to origin) and slowness, including the
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uncertainties for both of these. In the IDC source code and database, the back
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azimuth is referred to as only azimuth.</p>
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</section>
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<section id="algorithm">
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<h2>Algorithm<a class="headerlink" href="#algorithm" title="Permalink to this heading">¶</a></h2>
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<p>The algorithm computes polarization attributes for a three-component station using
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a modification to the <span id="id1">Jurkevics [<a class="reference internal" href="../base/references.html#id42" title="A. Jurkevics. Polarization analysis of three-component array data. Bull. Seismol. Soc. Am., 78(5):1725-1743, 1988. doi:10.1785/BSSA0710041105.">48</a>]</span> algorithm. Some of these attributes are
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then used to determine detection azimuth (seazp = P-type azimuth in degrees),
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detection slowness and azimuth/slowness uncertainties (inang1 = emergence (incidence)
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angle and rect = rectilinearity).</p>
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<p>A fixed noise window of 9.5 seconds ([-30s;-20.5s] with respect to trigger time)
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and a signal window of 5.5 seconds ([-4s;1.5s] with respect to trigger time)
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is used. The signal window is subdivided into intervals of 1.5s length which
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overlap by 50%.</p>
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<ol class="arabic simple">
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<li><p>De-mean data according to mean of noise window.</p></li>
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<li><p>Apply cosine ramp to noise data and filter the entire data window.</p></li>
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<li><p>Rotate three components into ZNE space.</p></li>
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<li><p>Compute 3x3 covariance matrix for each interval.</p></li>
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<li><p>Extract eigenvalues and compute parameters including rectilinearity.</p></li>
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<li><p>Choose the result set with the largest rectilinearity.</p></li>
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</ol>
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</section>
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<section id="picks">
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<h2>Picks<a class="headerlink" href="#picks" title="Permalink to this heading">¶</a></h2>
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<p>In addition to the extracted back azimuth and slowness values the rectilinearity
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is added as a comment to the resulting pick. The comment ID is
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<code class="docutils literal notranslate"><span class="pre">DFX:rectilinearity</span></code> and the comment is the value in string representation.</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="#">FX-DFX</a><ul>
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<li><a class="reference internal" href="#description">Description</a></li>
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<li><a class="reference internal" href="#algorithm">Algorithm</a></li>
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<li><a class="reference internal" href="#picks">Picks</a></li>
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<h4>Previous topic</h4>
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title="previous chapter">mb_IDC</a></p>
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<h4>Next topic</h4>
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title="next chapter">homogeneous</a></p>
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Version <b>6.9.1</b> Release
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