| Project/Area Number |
05640462
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
固体地球物理学
|
|---|
| Research Institution | University of Tokyo |
|---|
Principal Investigator |
MIYATAKE Takashi Univ.of Tokyo, Earthq.Res.Inst., Associate Professor, 地震研究所, 助教授 (60126183)
|
|---|
| Project Period (FY) |
1993 – 1994
|
| Project Status |
Completed (Fiscal Year 1994)
|
| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
|
|---|
| Keywords | Seismic source process / Dynamic rupture / Tokachi-Oki earthquake / Asperity / Barrier |
|---|
| Research Abstract |
Dynamic rupture process of the 1968 Tokachi-Oki earthquake has been investigated on the bais of a three-dimensional dynamic crack model with constraints of the results of previous waveform inversion. The stress drop distribution has been estimated by solving 3D equilibrium equations with the boundary condition of slip on the fault. The strength excess distribution and fracture toughness (critical stress intensity factor) distribution have been also estimated. The high stress drop regions and high strength excess regions, correspond asperities and barrier, respectively. We found two barriers and three asperities for the event. Comraring with topography, seismicity, gravity, and heat flow data, it seems that one of the barriers locates at the complicated surface topography.
|
