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The 2011 off the Pacific coast of Tohoku Earthquake: Crustal Deformation and Fault Model

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Mon, 2011-03-14 04:08 — admin

2011 off the pacific coast of Tohoku earthquake

 

A mega thrust earthquake with a moment magnitude 9.0 (JMA) occurred in Japan on March 11, 2011 (JST). The Geospacial Information Authority of Japan (GIS) constructed a fault model using coseismic surface displacement data observed by the GPS Earth Observation Network System (GEONET).

A preliminary fault model which consists of two rectangular faults with a uniform slip in an elastic half-space shows that

  • A total major rupture length reaches ~400 km with a fault width of ~80-90 km. (Northern segment: ~200 km long/ Sourthern segment: ~180 km long).
  • A fault upper edge is at a depth of 10 km.
  • A reverse fault motion is inferred. Slip amounts of northern segment and southern one are estimated to be ~28 m and ~6 m, respectively.
  • A total moment magnitude is 8.8. (Northern segment: Mw8.7 / Southern segment: Mw8.2)

    • For more information, visit: GSI Japan

    howdy folks