Rupture Characteristics of Deep Earthquakes

深部地震的破裂特征

• 批准号: 9706219
• 负责人: Terry Wallace
• 金额: $ 8.79万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706219&HistoricalAwards=false
• 关键词: Rupture; Characteristics; Deep; Earthquakes

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. ***

小行星9706219 本研究旨在研究深源地震的破裂特征。 深源地震的成因一直是地球科学中最重要的科学问题之一。 迄今为止，大部分工作都集中在地震图的上升时间和隐含的破裂起始阶段。 关于断层表面面积后来的增长和破裂过程的终止的工作一直在等待全球地震网甚宽频带地震仪的研制和安装。 在最近两次最大的深源地震中，1994年玻利维亚M=8.3和1996年弗洛雷斯海M=7.9的地震，破裂速度似乎很慢，与浅源地震相比，小于2.6 km/s。 这种缓慢的破裂可能是一种奇异的滑动弱化机制的产物，例如压力释放熔化。 然而，并不是所有的深源地震都表现出异常缓慢的破裂，这使得任何单一的解释都变得复杂。 这项研究涉及对深度从80公里到640公里的20多个事件的破裂进行调查。 ***