Seismicity of the Bering Glacier region and its relation to tectonic and glacial processes |
| |
| Authors: | Diane I Doser Katy R Wiest Jeanne Sauber |
| |
| Institution: | aDepartment of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968-0555, United States;bPlanetary Geodynamics Lab, Code 698, NASA's Goddard Space Flight Center, Greenbelt, MD, 20771, United States |
| |
| Abstract: | We relocated over 1000 earthquakes of magnitude > 0.1 occurring between 1973 and 2001 in the Bering Glacier region of southern Alaska. We used first-motion data from these events to determine focal mechanisms and directly invert for stress orientations. Our results indicate that much of the seismicity in the region is occurring within the North American plate in a zone where an inferred structure, which lies beneath Bering Glacier, intersects the Chugach-St. Elias fault system. Stress-field analysis indicates that the events in the Bering Glacier surge reservoir region are likely occurring on northeast-trending thrust faults, consistent with previous modeling that suggested thrust faulting would be enhanced in regions of ice draw down. We also observe a stress field compatible with either high-angle normal or reverse faulting in regions located northwest of the Bering Glacier. This may indicate localized complexities in interactions between the Bering Glacier structure and the Chugach-St. Elias fault system. |
| |
| Keywords: | Bering Glacier Southern Alaska Seismicity |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
