Rheology of faults in subduction zones and its implications for the generation of slow earthquakes
| Project/Area Number |
25287135
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Partial Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Japan Agency for Marine-Earth Science and Technology |
|---|
Principal Investigator |
Hirose Takehiro 国立研究開発法人海洋研究開発機構, 高知コア研究所, グループリーダー代理 (40470124)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
Tanikawa Wataru 国立研究開発法人海洋研究開発機構, 高知コア研究所, 主任研究員 (70435840)
Takahashi Miki 国立研究開発法人産業技術総合研究所, 活断層・地震研究センター, 主任研究員 (40470033)
|
|---|
| Research Collaborator |
Sawai Michiyo
Noda Yoji
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2013: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
|
|---|
| Keywords | スロー地震 / 断層 / 摩擦 / 沈み込み帯 / 摩擦実験 / 熱水 / 地震 |
|---|
| Outline of Final Research Achievements |
Slow earthquakes in subduction zones have been considered as the key phenomenon associated with megathrust earthquakes. Several mechanisms have been proposed, but the cause of slow earthquakes remains elusive. One possibility is that an increase in pressure of pore fluid promote slow slip in subduction faults, yet role of fluid pressure in mechanics of slow earthquakes is poorly understood. Therefore, we conducted friction experiments on blueschist fault rocks to investigate the influence of effective stress on frictional behavior. Our results show a transition from stable to unstable behavior with decreasing effective normal stress, which is mechanically equivalent to increasing fluid pressure. This transition is a prerequisite for generating slow earthquakes. Our results imply that high pore pressures are a key factor for nucleating slip leading to slow earthquakes.
|
Report
(4 results)
Research Products
(31 results)
-
-
-
[Journal Article] Fault rheology beyond frictional melting2015
Author(s)
Lavallee, Y., T. Hirose, J.E. Kendrick, K.-U. Hess and D.B. Dingwell
-
Journal Title
Proceedings of the National Academy of Sciences
Volume: 112
Issue: 30
Pages: 9276-9280
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
-
[Journal Article] Spine growth and seismogenic faulting at Mt. Unzen, Japan2015
Author(s)
A. J. Hornby, J. E. Kendrick, O. D. Lamb, T. Hirose, S. D. Angelis, F. W. von Aulock, K. Umakoshi, T. Miwa, S. H. D. Angelis, F. B. Wadsworth, K. Hess, D. B. Dingwell, Y. Lavallée
-
Journal Title
Journal of Geophysical Research; Solid Earth
Volume: 120
Issue: 6
Pages: 4034-4054
DOI
Related Report
Peer Reviewed / Int'l Joint Research
-
[Journal Article] NanTroSEIZE Stage 3: NanTroSEIZE Plate Boundary Deep Riser 32015
Author(s)
Tobin, H., Hirose, T., Saffer, D., Toczko, S., Maeda, L., Kubo, Y., and the Expedition 348 Scientists
-
Journal Title
Proceedings of the Integrated Ocean Drilling Progrram
Volume: 348
Related Report
Open Access
-
-
-
-
-
-
-
-
[Journal Article] NanTroSEIZE Stage 3: NanTroSEIZE plate boundary deep riser 32013
Author(s)
Hirose, T., Saffer, D. M., Tobin, H. J., Toczko, S., Maeda, L., Kubo, Y., Kimura, G., Moore, G. F., Underwood, M. B. and Kanagawa, K.
-
Journal Title
IODP Scientific Prospectus
Volume: 348
Pages: 1-36
DOI
Related Report
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
