Stress induced by 2011 Tohoku Earthquake

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<p>@[toc]</p> <h1>Overview</h1> <p>The recent magnitude 5.1 earthquake in the Korean peninsular requires assessment of the possible mechanisms that can trigger such a significant intra-plate earthquakes in the region that is highly populated.</p> <p>In this project, we will try to compute stress changes in and around the Korean peninsular caused by the 2011 Tohoku earthquakes. This calculation for one of the largest earthquake ever recorded will set an upper limit on the possible stress changes in the regions about 1000 km away from the Japan trench. </p> <p>This study must be the first step towards further discussion on the interaction between the existing regional stresses and event-induced stress changes, strengths of the potentially seismogenic faults in the Korean peninsular and the effects of accumualted stress changes due to repeating earthqukes on the surrounding subduction zones.</p> <h1>Model Setup</h1> <h2>Study area</h2> <ul> <li>Lon: 116$^{\circ}$E - 150$^{\circ}$E</li> <li>Lat: 29$^{\circ}$N - 46$^{\circ}$N</li> <li>Depth: 0 - 400 km(?, TBD)</li> </ul> <h2>Crustal and lithospheric structure of the region</h2> <p>We construct a model with laterally variable crustal and lithospheric thickness based on the <a href="http://igppweb.ucsd.edu/~gabi/litho1.0.html" rel="nofollow">CRUST1.0</a> model.</p> <p>For further details, see the <a href="https://osf.io/6szrn/wiki/Tohoku_Defining%20boundary%20surfaces%20and%20fault%20plane/" rel="nofollow">"Defining boundary surfaces and fault plane" wiki</a>.</p> <h2>Source model for the 2011 Tohoku earthquake</h2> <p>We take a source model for this earthquake from <a href="http://equake-rc.info/SRCMOD/" rel="nofollow">http://equake-rc.info/SRCMOD/</a>. For instance, Ide et al.'s model (Science, 2011), shown below, can be retrieved from <a href="http://equake-rc.info/SRCMOD/searchmodels/viewmodel/s2011TOHOKU01IDEx/" rel="nofollow">this page</a>.</p> <p><img alt="Slip distribution from the 2011 Tohoku earthquake finite source model from Ide et al. (Science, 2011)" src="http://equake-rc.info/media/srcmod/_img_files/s2011TOHOKU01IDEx.png"></p> <p><img alt="Map view of the Ide et al. (Science, 2011)'s model" src="https://mfr.osf.io/export?url=https://osf.io/74snx/?action=download%26direct%26mode=render&initialWidth=682&childId=mfrIframe&format=600x600.jpeg"></p> <h2>Meshing</h2> <p>The retrieved surface and interfaces are discretized into a mesh to be fed into PyLith. For details, see the <a href="https://osf.io/6szrn/wiki/Tohoku_Meshing/" rel="nofollow"> "Meshing" wiki</a>.</p> <h1>Models</h1> <h2>Simple models</h2> <p>see <a href="https://osf.io/6szrn/wiki/Tohoku_Simple%20Models/" rel="nofollow">Simple Models</a> wiki</p> <h2>Complex models</h2> <p>see <a href="https://osf.io/6szrn/wiki/Tohoku_Complex%20Models/" rel="nofollow">Complex Models</a> wiki</p>
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