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