地球与行星物理学术报告通知（202621期）- Keith D. Koper

报告人简介：

Keith D. Koper is professor of geophysics and director of the seismological observatory at the University of Utah. He received a BA in math, geology, and ISP from Northwestern University in 1993 and a PhD in geophysics from Washington University in 1998. Dr. Koper was a post-doctoral researcher at the University of Arizona during 1998–2001 and assistant/associate professor at Saint Louis University from 2001 until his arrival in Utah in 2010. His research interests include array seismology; Earth's ambient seismic noise field; forensic seismology; rupture imaging of giant earthquakes; seismicity and tectonics of the intermountain West; mining induced earthquakes; and the structure and dynamics of Earth's deep interior—especially the core. Prof. Koper has published over 100 peer-reviewed journal articlesincluding Science, Nature, Nature Geoscience, and his research has been funded by the U.S. Geological Survey, the National Science Foundation, the Dept. of Energy, and the Air Force Research Laboratory. He is former vice-chair and chair of the Utah Seismic Safety Commission and recently finished a term as the founding editor-in-chief ofThe Seismic Record.

报告内容摘要：

The overwhelming majority of deep earthquakes (h > 50 km) occur within subducting slabs, where temperatures are relatively cool compared with the ambient mantle. However, a small number of deep events have been documented in the continental mantle, far from subducting slabs. In many cases, these continental mantle earthquakes occur in nominally ductile material, and the nature of their source mechanisms remains unclear. Here, I summarize observations of several dozen continental mantle earthquakes in the Intermountain West region of North America and consider their geodynamic implications.