Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project
Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project
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DOI：
10.1038/nature05253
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发表时间：
2006-11
期刊：
影响因子：
64.8
通讯作者：
K. Ma;Hidemi Tanaka;Sheng-rong Song;C. Wang;J. Hung;Y. Tsai;J. Mori;Yen-Fang Song;Eh-Chao Yeh;W. Soh;H. Sone;L. Kuo;Hung-Yu Wu
中科院分区：
文献类型：
--
作者：
K. Ma;Hidemi Tanaka;Sheng-rong Song;C. Wang;J. Hung;Y. Tsai;J. Mori;Yen-Fang Song;Eh-Chao Yeh;W. Soh;H. Sone;L. Kuo;Hung-Yu Wu
在地震中确定地震断裂能并了解断层带的相关形成和发展需要地震学和地质现场数据的结合。大地震破裂时滑动带的实际厚度是未知的，它是理解能量耗散、破裂过程和地震效率的关键地震参数。1999年台湾集集发生的7.7级地震在地表或地表附近产生了巨大的滑动（8至10米），钻孔钻探可以达到这一水平，这为在最近一次地震中发生大滑动的断层提供了难得的采样机会。本文介绍了台湾龙浦断层钻探项目的岩心，并确定了与池池地震有关的主要滑动带。根据断层样品断层泥带的颗粒尺寸估算的地表断裂能与近场地震数据确定的地震断裂能直接进行比较。通过比较，断层泥表面能对地震击穿功的贡献量化为6%。
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. 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, 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,. From the comparison, the contribution of gouge surface energy to the earthquake breakdown work is quantified to be 6 per cent.