Rupture Characteristics of Deep Earthquakes

[9706219]华莱士这项研究是为了研究深地震的破裂特征。深层地震的原因仍然是地球科学中最重要的科学问题之一。迄今为止的大部分工作都集中在地震记录的上升时间和隐含的破裂起始阶段。关于断层表面面积的后期增长和破裂过程的终止的工作一直在等待全球地震台网非常宽带地震仪的开发和安装。在最近两次最大的深层地震中，1994年M=8.3的玻利维亚地震和1996年M=7.9的弗洛雷斯海地震，破裂速度似乎非常缓慢，与浅层地震相比不到2.6公里/秒。这种缓慢的破裂可能是一种特殊的滑移弱化机制的产物，例如压力释放融化。然而，并不是所有的深层地震都表现出异常缓慢的破裂，这使任何单一的解释都变得复杂。这项研究涉及对深度在80至640公里之间的20多个事件的破裂进行调查

9706219 Wallace This research is to study the rupture characteristics of deep earthquakes. The cause of deep earthquakes remains one of the most important scientific questions in earth sciences. Most of the work to date has concentrated on the rise time of the seismogram and the implied rupture initiation phase. Work on the later growth of the fault surface area and termination of the rupture process has waited on the development and installation of very wide-band seismometers of the Global Seismic Network. In the two largest recent deep earthquakes, the 1994 M=8.3 Bolivian and 1996 M=7.9 Flores Sea events, the rupture velocity appears to be very slow, less than 2.6 km/s as compared to shallow earthquakes. It is possible that this slow rupture is a product of an exotic slip-weakening mechanism, for example, pressure-release melting. However, not all deep earthquakes appear to have extraordinarily slow rupture, complicating any single explanation. This research involves the investigation of the rupture of more than 20 events ranging in depth from 80 to 640 km. ***