| Project/Area Number |
61302022
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
HIROSAWA TOMOWO Farc. of Science, Tohoku Univ., Prof., 理学部, 教授 (80011568)
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| Co-Investigator(Kenkyū-buntansha) |
KUSUNOSE Kinichiro Geological Survey of Japan, Chief Tech. Official, 地質調査所, 主任研究官
MATSU'URA Mistuhiro Fac. of Science, Tokyo Univ., Lecturer, 理学部, 講師 (00114645)
HASEGAWA Takeshi Akita Nat. Col. Tech., Assoc. Prof., 助教授 (10004409)
YAMAMOTO Kiyohiko Fac. of Science, Tohoku Univ., Res. Assoc., 理学部, 助手 (90004390)
OHNAKA Mitiyasu Earthq. Res. Inst., Tokyo Yniv., Assoc. Prof., 地震研究所, 助教授 (00012956)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥9,500,000 (Direct Cost: ¥9,500,000)
Fiscal Year 1987: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1986: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | Stick-Slip / Fault Surface Roughness / Fault Surface Waviness / Corner Wavelength of Surface Roughness / Fracture Energy / Rupture Velocity / Stress Drop / 短周期地震波 / 固着一すべり / スティック-スリップ |
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| Research Abstract |
Experimental studies are performed of the dynamic behavior of unstable sliding on a pre-existing fault in a rock sample in relation to the temporal and spatial varitions of local stresses on the fault. The main results are as follows: 1)The surface roughness of a fault can be characterized by the corner wavelengthdefined in the power spectrum of the surface topography. 2)The occurrence criterion of stick-slip can be expressed by a relation between the corner wavelengthand the total amount of slip obtained for a stick-slip event. 3)In the case of anonuniform distribution of strength on a fault, a high-strength area governs the initiation and the termination of unstable sliding. 4)It is found for a fault composite of granite and marble that unstable sliding is apt to propagate stably at a low rupture velocity over a long distance. 5)A relation is experimentally obtained for the maximum slip velocity divided by rupture velocity and the stress drop by rigidity. 6)Empirical relations are found for maximum slip velocity, peak acceleration, and f_<max>, in relation to the radiation of high-frequency elastic waves.
Fracture energy is estimated on the basis of experimental results with respect to both the amount and the particle size distribution of the gouges developed during frictional sliding. It is found that the fracture energy cocupies only 0.01-0.1% in the total energy released by the testing machine.
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