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2001年昆仑山地震是一次不寻常的事件,产生了400km长的地表破裂。这次事件的区域宽频带记录提供了精确观测地震期间断层破裂速度的机会,对于认识地震危险性和理解地震物理具有重要意义。我们得到破裂在长为400km的地震断层上传播的平均速度为3.7～3.9km/s,超过了地壳脆性部分的剪切波速。破裂以亚瑞雷波速开始,以后增大到超剪切波速,经过100km的传播之后可能达到5km/s。
The Kunlun Mountains earthquake in 2001 was an unusual event, resulting in a surface rupture of 400 km in length. Regional broadband recording of this event provides an opportunity to accurately observe the rate of fault rupture during a seismic event and is of great importance to understanding the seismic hazard and understanding seismic physics. The average velocity of rupture propagating over an earthquake fault of 400km in length is 3.7 ~ 3.9km / s, which exceeds the shear wave velocity in the brittle part of the crust. The rupture starts with the Rayleigh wave velocity and then increases to the super shear wave velocity, which may reach 5 km / s after propagation of 100 km.