2012 Fiscal Year Final Research Report
Investigation of stress field and pulverization mechanism at the fault rapture front propagating at a high speed
| Project/Area Number |
23654170
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Akita University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OTSUKI Kenshiro 東北大学, 理学研究科, 名誉教授 (70004497)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
MUTO Jun 東北大学, 理学研究科, 助教 (40545787)
|
|---|
| Project Period (FY) |
2011 – 2012
|
| Keywords | 断層 / 固着すべり / 応力場 / ガス圧式三軸試験機 / 粉砕 |
|---|
| Research Abstract |
In order to clarify the mechanism of rock pulverization around fault, a series of stick-slip experiment was conducted with a gas-medium triaxial apparatus, recording strains with5MHz sampling rate for up to10 channels. The mechanical data confirmed a supershear velocity of the propagation of rapture front during large stick-slip. Fracture pattern in the pulverized cores shows obvious dependence on the slip direction. It is likely that anomalously high axial stress caused strong tension stress on the slip plane during slip resulted in pervasive mode I fractures.
|
