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Zone Geometry Analysis</h2>\n\n<p><strong>\n  Most Likely Geometry: Strike = 308.59, Dip = 27.0<br/>\n  Most Likely Depth if on Planar Slab Interface = 29.72 km<br/>\n  Most Likely Depth if on Polynomial Slab Interface = 33.12 km\n</strong></p>\n\n<figure class=\"left\">\n  <img src=\"lo2_basemap.png\" alt=\"\"/>\n  <figcaption>Basemap of subduction zone showing the area of the trench constrained in this example. Earthquake locations from the gCMT catalog and EHB catalog (gray circles, sized according to magnitude) are shown. Maroon rectangle indicates the area shown in cross section (c); all earthquakes within this area may be used to constrain trench geometry.\n  </figcaption>\n</figure>\n\n<figure class=\"left\">\n  <img src=\"lo2_crosssection.png alt=\"\"/>\n  <figcaption>Cross-section of subduction zone taken perpendicular to the average strike of gCMTs that match selection criteria and whose equivalent EHB or NEIC locations lie within the maroon box from Figure 1. Gold CMTs are mechanisms from the gCMT catalog plotted at their equivalent EHB catalog location, used to constrain trench strike and dip. Orange CMTs are mechanisms without EHB locations, placed instead at the equivalent event location in the NEIC catalog, and also used to constrain geometry. Light and dark gray circles are events from the EHB catalog south and north of the plane of the cross-section, respectively, but not used to constrain geometry because either (i) they did not have a corresponding mechanism in the gCMT catalog, or (ii) their mechanism in the gCMT catalog did not match selection criteria. The trench location is marked with a red square. Probability density functions for EHB and NEIC locations are shown as green lines, scaled by a factor of x20 for display purposes. The black solid line labeled 'most likely plane' describes the best fitting geometry. The initial locations of the 'new event' used to help constrain geometry are shown by black circles and marked with arrows corresponding to the gCMT epicentroid and NEIC epicenter. PDFs for these locations are shown in red; the most likely depth for each location is marked with a white star, at the intersection of the most likely subduction interface plane and the epicentroid/center location, assuming that the event represents rupture on the main subduction thrust. The best-fitting fault plane from the gCMT catalog for the new event is shown with a black dashed line and labeled 'CMT solution'. The red dashed line is the most likely interface following a polymonial SVD fit to the data, rather than planar.\n  </figcaption>\n</figure>\n\n<figure class=\"left\">\n  <img src=\"lo2_crossection2.png\" alt=\"\"/>\n</figure>\n\n<figure class=\"left\">\n  <img src=\"lo2_dipdiscrepancy.png\" alt=\"\"/>\n  <figcaption>Variation in dip of best-fitting fault planes from the gCMT catalog for all events used to constrain trench geometry across the plane of the cross-section. Individual event dips are shown with small dark gray circles, sized with magnitude. Large mechanisms indicate the average dip in 20km bins across the plane of the cross-section. Light gray mechanisms represent a bulk average; dark gray represents a moment-weighted average.\n  </figcaption>\n</figure>","sha256":"vN0Yxo7512qlqyCMb+Rg3eJgLdHAeY5i/na9y1u6D/o="},"lo2_crosssection.png":{"contentType":"image/png","lastModified":1455563564000,"length":105518,"url":"https://earthquake.usgs.gov/product/scitech-text/usp000gsm5-1455563633104/admin/1455564406442/lo2_crosssection.png","sha256":"wXN+Fy1cA5R+wNCIoe2Q+wlxIhFTITW9DNT67WaFNDk="},"lo2_dipdiscrepancy.png":{"contentType":"image/png","lastModified":1455563577000,"length":29942,"url":"https://earthquake.usgs.gov/product/scitech-text/usp000gsm5-1455563633104/admin/1455564406442/lo2_dipdiscrepancy.png","sha256":"dO5Dyqo9W2yq2iHeMLNr/ayEsy9Ab7GM2Wl5lso4klo="},"lo2_basemap.png":{"contentType":"image/png","lastModified":1455563557000,"length":420666,"url":"https://earthquake.usgs.gov/product/scitech-text/usp000gsm5-1455563633104/admin/1455564406442/lo2_basemap.png","sha256":"GIp/EflUlK4Ym0zabg41T6Ee+AQd4NVzRcCUgRNK3/U="},"lo2_crosssection2.png":{"contentType":"image/png","lastModified":1455563570000,"length":153731,"url":"https://earthquake.usgs.gov/product/scitech-text/usp000gsm5-1455563633104/admin/1455564406442/lo2_crosssection2.png","sha256":"jhfDrPHWYtjE32Z8a+cv9m/MB5u6omlexZnv/VgV1MY="}}}]}},"geometry":{"type":"Point","coordinates":[170.635,-22.352,27]},"id":"usp000gsm5"}