Observation of long supershear rupture during the magnitude 8.1 Kunlunshan earthquake
Observation of long supershear rupture during the magnitude 8.1 Kunlunshan earthquake
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DOI：
10.1126/science.1086832
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发表时间：
2003-08-08
期刊：
影响因子：
56.9
通讯作者：
Vallée, M
中科院分区：
文献类型：
--
作者：
Bouchon, M;Vallée, M
2001年昆仑山地震是一次非同寻常的事件，造成了400公里长的地表破裂。这一事件的区域宽带记录提供了一个准确观察地震期间断层破裂速度的机会，这对地震风险和理解地震物理学具有重要意义。我们确定，在400公里长的断层上，破裂以平均3.7至3.9公里/秒的速度传播，这超过了地壳脆性部分的剪切速度。破裂以亚瑞利波速开始，并在大约100公里的传播后成为超切变，可能接近5公里/秒。
The 2001 Kunlunshan earthquake was an extraordinary event that produced a 400-km-long surface rupture. Regional broadband recordings of this event provide an opportunity to accurately observe the speed at which a fault ruptures during an earthquake, which has important implications for seismic risk and for understanding earthquake physics. We determined that rupture propagated on the 400-km-long fault at an average speed of 3.7 to 3.9 km/s, which exceeds the shear velocity of the brittle part of the crust. Rupture started at sub - Rayleigh wave velocity and became supershear, probably approaching 5 km/s, after about 100 km of propagation.