The 2011 off the Pacific coast of Tohoku Earthquake: Postseismic Slip Distribution Model (Preliminary)
Postseismic Slip Distribution Model Inferred from GEONET data
Released: 2011.03.15 Updated: 2012.03.30 Japanese
Postseismic Slip Distribution Model
We constructed a postseismic slip (afterslip) distribution model using surface displacement data observed by the GPS Earth Observation Network System (GEONET) for the 2011 off the Pacific coast of Tohoku Earthquake.
Table. 1 Postseismic deformation and estimated slip
a All periods start at 18:00, 2011-03-11 in Japan Standard Time (JST)
b The GPS data at which the maximum displacement was observed in most periods were not available for this period.
Notice:
- Eastward displacements are observed along the Pacific coast from Aomori Prefecture to Chiba Prefecture.
- The observed postseismic displacement partly includes crustal deformation due to aftershocks.
- A postseismic slip expands in and around the inferred coseismic slip area. In particular, relative large slips are estimated in the northwest and in the south (off Choshi) of the coseismic slip area.
Table. 1 Postseismic deformation and estimated slip
| Perioda | Maximum horizontal displacement | Estimated slip (Maximum) | Estimated slip (southern local maximum) | Moment magnitude (Mw) |
|---|---|---|---|---|
| 2011-03-13 06:00 | ~12 cm b | ~37 cm | ~23 cm | 8.03 |
| 2011-03-14 03:00 | ~15 cm b | ~47 cm | ~27 cm | 8.10 |
| 2011-03-15 03:00 | ~18 cm b | ~55 cm | ~32 cm | 8.14 |
| 2011-03-16 09:00 | ~23 cm | ~66 cm | ~37 cm | 8.16 |
| 2011-03-18 03:00 | ~25 cm | ~73 cm | ~41 cm | 8.19 |
| 2011-03-22 03:00 | ~29 cm | ~87 cm | ~47 cm | 8.24 |
| 2011-03-25 03:00 | ~32 cm | ~97 cm | ~52 cm | 8.27 |
| 2011-03-31 03:00 | ~37 cm | ~108 cm | ~57 cm | 8.31 |
| 2011-04-07 03:00 | ~41 cm | ~123 cm | ~61 cm | 8.33 |
| 2011-04-14 03:00 | ~44 cm | ~136 cm | ~65 cm | 8.36 |
| 2011-04-21 03:00 | ~46 cm b | ~150 cm | ~69 cm | 8.38 |
| 2011-04-28 03:00 | ~49 cm | ~158 cm | ~74 cm | 8.39 |
| 2011-05-05 03:00 | ~51 cm | ~163 cm | ~74 cm | 8.42 |
| 2011-05-12 03:00 | ~53 cm | ~172 cm | ~77 cm | 8.42 |
| 2011-05-29 18:00 | ~57 cm | ~189 cm | ~84 cm | 8.44 |
| 2011-06-13 18:00 | ~61 cm | ~200 cm | ~87 cm | 8.46 |
| 2011-06-26 18:00 | ~63 cm | ~204 cm | ~89 cm | 8.48 |
| 2011-07-12 18:00 | ~65 cm | ~216 cm | ~90 cm | 8.48 |
| 2011-07-27 18:00 | ~68 cm | ~226 cm | ~94 cm | 8.50 |
| 2011-08-14 18:00 | ~70 cm | ~238 cm | ~99 cm | 8.51 |
| 2011-08-29 18:00 | ~72 cm | ~243 cm | ~99 cm | 8.52 |
| 2011-09-27 18:00 | ~76 cm | ~257 cm | ~102 cm | 8.53 |
| 2011-10-31 18:00 | ~79 cm | ~270 cm | ~104 cm | 8.55 |
| 2011-11-27 18:00 | ~81 cm | ~279 cm | ~106 cm | 8.56 |
| 2011-12-25 18:00 | ~84 cm | ~288 cm | ~107 cm | 8.57 |
| 2012-01-29 18:00 | ~86 cm | ~298 cm | ~110 cm | 8.57 |
| 2012-02-26 18:00 | ~88 cm | ~309 cm | ~111 cm | 8.58 |
| 2012-03-26 18:00 | ~89 cm | ~318 cm | ~112 cm | 8.59 |
a All periods start at 18:00, 2011-03-11 in Japan Standard Time (JST)
b The GPS data at which the maximum displacement was observed in most periods were not available for this period.
Notice:
- Next update of this page will be on July 1, 2012.
- This is a preliminary result. The analysis result is possibly updated with adding new data.
- We updated the models before April 4, 2011 with additional GPS data. (Updated on February 3, 2012)
Slip Distribution Model
NEW 20110311 18:00 to 20120326 18:00 JST
Postseismic slip distribution
Fitting between observation and calculation
Comparison between coseismic and postseismic slip distributions
Previous results
1. Postseismic slip distribution and Fitting between observation and calculation
= From 2011-09-27 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-04-29 to 2011-08-29 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-03-25 to 2011-04-28 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-03-13 to 2011-03-24 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
2. Comparison between coseismic and postseismic slip distributions / ground displacements
= From 2011-09-27 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-04-29 to 2011-08-29 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-03-25 to 2011-04-28 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-03-13 to 2011-03-24 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
Postseismic slip distribution
Fitting between observation and calculation
Comparison between coseismic and postseismic slip distributions
Previous results
1. Postseismic slip distribution and Fitting between observation and calculation
= From 2011-09-27 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-04-29 to 2011-08-29 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-03-25 to 2011-04-28 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
= From 2011-03-13 to 2011-03-24 =
Postseismic slip distribution Fitting (Horizontal comp.) Fitting (Vertical comp.)
2. Comparison between coseismic and postseismic slip distributions / ground displacements
= From 2011-09-27 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-04-29 to 2011-08-29 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-03-25 to 2011-04-28 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
= From 2011-03-13 to 2011-03-24 =
Coseismic and postseismic slip distributions Coseismic and postseismic displacements (Horizontal comp.) Coseismic and postseismic displacements (Vertical comp.)
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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