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<p><a href="page.php?w=seismic_hazard">seismic hazard</a>, if the locations can be determined to be within a kilometer or two, for small earthquakes. For this, computer programs use an iterative process, involving a 'guess and correction' algorithm. As well, a very good model of the local crustal <a href="page.php?w=seismic_velocity">velocity</a> structure is required: seismic velocities vary with the local geology. For P waves, the relation between velocity and <a href="page.php?w=bulk_density">bulk density</a> of the medium has been quantified</p><p>
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