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GSI HOME > Research & Development > Geography and Crustal Dynamics Research Center > The 2011 off the Pacific coast of Tohoku Earthquake: Crustal Deformation and Fault Model (Preliminary) Last Updated : March 14, 2011

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

Crustal Deformation and Fault Model obtained from GEONET data analysis (Preliminary)

Released:2011.03.13 Updated:2011.04.22  Japanese

Crustal Deformation and Fault Model

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

This is a preliminary result. We constructed a revised model using additional GPS data which manually collected after restoration of a data transmission system.
 

Fault Model

The 2011 off the Pacific coast of Tohoku Earthquake

Date-Time March 11, 2011 14:46 JST
March 11, 2011 05:46 UTC
Hypocenter Location 38.103°N, 142.860°E Depth:24 km (JMA, as of 2011-03-13)
38.322°N, 142.369°E Depth:22.4 km (USGS, as of 2011-03-13)
Moment Magnitude 9.0 (JMA, as of 2011-03-13)
9.0 (USGS, as of 2011-03-13)

Contact

  • IMAKIIRE Tetsuro : Principal Researcher for Geography and Crustal Dynamics Research Center
  • TOBITA Mikio : Director of Division (Crustal Deformation Research Division)
  • OZAWA Shinzaburo : Chief Researcher (Crustal Deformation Research Division)
  • NISHIMURA Takuya : Chief Researcher (Crustal Deformation Research Division)
  • SUITO Hisashi : Cheif Researcher (Crustal Deformation Research Division)
  • KOBAYASHI Tomokazu : Researcher (Crustal Deformation Research Division)

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