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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 379 - 389 (11page)
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초록· 키워드
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The Suryum fault is an active fault in southeast Korea crosscutting the Quaternary sediment deposit. We conducted outcrop-scale to microscale observations of the fault slip zone and performed shear experiments on the fault gouge at subseismic (3–30 μm/s) and seismic slip rates (0.53 m/s). The gouge is rich in clay minerals (> 58%), particularly in expandable clay minerals (40%). In the gouge zone, a very narrow (20–150 μm thick) principal slip zone (PSZ), identified by the strong alignment of clay minerals, was developed. At several places along the fault, the gouge is observed to have been injected into the Quaternary wallrock sediments. The development of the narrow PSZ is incompatible with the velocity-strengthening behavior of the Suryum fault gouge observed in the shear tests, and it may indicate that seismic rupture could be propagated along the PSZ in the clay-rich gouge. Slip localization into the PSZ was presumably possible because of significant dynamic fault weakening due to thermal pressurization (or buildup of pore pressure caused by frictional heating) in the low-permeability clay gouge during fast slip. The gouge injections along the Suryum fault may be the geological record of gouge fluidization caused by thermal pressurization. This idea is supported by observations of very low friction of the Suryum fault gouge when sheared experimentally at the seismic slip rate and of the gouge injections in the sheared gouge. The dynamic weakness of the Suryum fault implies that large displacement and low-frequency ground motion at near-surface depths would be possible when it is reactivated.
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참고문헌 (56)
참고문헌 신청
Aitken, M. J. / 1998 / An Introduction to Optical Dating: The Dating of Quaternary Sediments by the Use of Photon-stimulated Luminescence / Oxford University Press :280
Akasegawa, K. / 2016 / An investigation of coseismic OSL/TL time zeroing of quartz gouge based on low- to high-velocity friction experiments / American Geophysical Union, Fall Meeting 2016
Jean-Philippe Avouac / 2015 / From Geodetic Imaging of Seismic and Aseismic Fault Slip to Dynamic Modeling of the Seismic Cycle / Annual Review of Earth and Planetary Sciences 43(1):233~271
F. Balsamo / 2014 / The signature and mechanics of earthquake ruptures along shallow creeping faults in poorly lithified sediments / Geology 42(5):435~438
Sébastien Boutareaud / 2008 / Clay-clast aggregates: A new textural evidence for seismic fault sliding? / Geophysical Research Letters 35(5)
Akasegawa, K. / 2016 / An investigation of coseismic OSL/TL time zeroing of quartz gouge based on low- to high-velocity friction experiments / American Geophysical Union, Fall Meeting 2016
Jean-Philippe Avouac / 2015 / From Geodetic Imaging of Seismic and Aseismic Fault Slip to Dynamic Modeling of the Seismic Cycle / Annual Review of Earth and Planetary Sciences 43(1):233~271
F. Balsamo / 2014 / The signature and mechanics of earthquake ruptures along shallow creeping faults in poorly lithified sediments / Geology 42(5):435~438
Sébastien Boutareaud / 2008 / Clay-clast aggregates: A new textural evidence for seismic fault sliding? / Geophysical Research Letters 35(5)
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