Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project

被引:193
|
作者
Ma, Kuo-Fong [1 ]
Tanaka, Hidemi
Song, Sheng-Rong
Wang, Chien-Ying
Hung, Jih-Hao
Tsai, Yi-Ben
Mori, Jim
Song, Yen-Fang
Yeh, Eh-Chao
Soh, Wonn
Sone, Hiroki
Kuo, Li-Wei
Wu, Hung-Yu
机构
[1] Natl Cent Univ, Dept Earth Sci, Chungli 32054, Taiwan
[2] Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan
[3] Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan
[4] Kyoto Univ, Disaster Prevent Res Inst, Kyoto 6110011, Japan
[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan
[6] Agcy Marine Earth Sci & Technol, Kochi Inst Core Sample Res, Kochi 7838502, Japan
[7] Kyoto Univ, Dept Geol & Mineraol, Kyoto 6068501, Japan
关键词
D O I
10.1038/nature05253
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Determining the seismic fracture energy during an earthquake and understanding the associated creation and development of a fault zone requires a combination of both seismological and geological field data(1). The actual thickness of the zone that slips during the rupture of a large earthquake is not known and is a key seismological parameter in understanding energy dissipation, rupture processes and seismic efficiency. The 1999 magnitude 7.7 earthquake in Chi-Chi, Taiwan, produced large slip (8 to 10 metres) at or near the surface(2), which is accessible to borehole drilling and provides a rare opportunity to sample a fault that had large slip in a recent earthquake. Here we present the retrieved cores from the Taiwan Chelungpu-fault Drilling Project and identify the main slip zone associated with the Chi-Chi earthquake. The surface fracture energy estimated from grain sizes in the gouge zone of the fault sample was directly compared to the seismic fracture energy determined from near-field seismic data(3,4). From the comparison, the contribution of gouge surface energy to the earthquake breakdown work is quantified to be 6 per cent.
引用
收藏
页码:473 / 476
页数:4
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