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

Released: 2011.04.21 Revised: 2011.04.22 Japanese

We constructed a distributed slip model using coseismic surface displacement data observed by the GPS Earth Observation Network System (GEONET) for the 2011 off the Pacific coast of Tohoku Earthquake. The vertical displacement calculated using our slip model suggests that large subsidence occurs along the Pacific coast.

GSI manually collected GPS data which were unavailable due to the suspension of a data transmission system just after the earthquake. We used these data to revise the preliminary model presented on March 14, 2011.

Coseismic slip distribution

Fitting between observation and calculation

Vertical displacement calculated from our slip distribution model

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)

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IMAKIIRE Tetsuro : Research Coordinator for Geography and Crustal Dynamics Research
TOBITA Mikio : Head of Division (Crustal Deformation Research Division)
OZAWA Shinzaburo : Chief Researcher (Crustal Deformation Research Division)
NISHIMURA Takuya : Chief Researcher (Crustal Deformation Research Division)
SUITO Hisashi : Researcher (Crustal Deformation Research Division)
KOBAYASHI Tomokazu : Researcher (Crustal Deformation Research Division)

Postseismic Slip Distribution Model
Rectangular Fault Model 
Rectangular Fault Model (Preliminary) 
Slip Distribution Model (Preliminary) 
Crustal Deformation (In Japanese)