Collaborative Research: Aftershock Imaging with Dense Arrays (AIDA) for the August 23, 2011, Mw 5.8, Virginia earthquake aftershock sequence

合作研究：2011 年 8 月 23 日，Mw 5.8，弗吉尼亚地震余震序列的密集阵列余震成像 (AIDA)

• 批准号: 1160666
• 负责人: John Hole
• 金额: $ 2.33万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1160666&HistoricalAwards=false
• 关键词: Collaborative; Research; Aftershock; Imaging; Dense

This RAPID supports post-seismic deployment of novel high density seismic arrays usinginstruments from the Earthscope Flexible Array provided by IRIS/PASSCAL to investigate theMw 5.8 Virginia earthquake of August 23, 2011. This event had a NE-striking reverse faulting focalmechanism, a hypocentral depth of 6 km (USGS), and occurred in a previously recognized seismicregion known as the ?Central Virginia Seismic Zone?. This event passes with ca. 15 km of a NW-SEoriented deep seismic reflection profile contracted in 1981 by the USGS, providing a rare opportunityto link seismicity to deep structure in the eastern U.S. The preliminary hypocentral estimate suggeststhat the earthquake occurred within a complex zone of east-dipping reflections that define animbricated Paleozoic thrust sheet of the central Appalachian Piedmont that is underlain by Grenvillebasement at a depth of ca. 9 km.By merging the technologies of earthquake location with high resolution structural imaging, this experiment seeks to demonstrate how aftershocks can be exploited by both passive and active seismic techniques to identify seismogenic structures at depth as well as energy propagation characteristics for a region where both types of information are either rare or non-existent. The recording experiment constitutes a prototype for imaging earthquake processes and associated structures with unprecedented resolution by exploiting a new generation recording technologies. If the data proves as rich as expected, this experiment may well establish a new protocol for future aftershocks studies.

这种迅速支持在艾里斯/密封仪提供的地球柔性阵列的新型高密度地震阵列的地震后部署，以调查它们，以调查它们，以调查它们。5.82011年8月23日的弗吉尼亚州地震。这一事件具有反向反向的反向局部性，高度的焦点，高度的中性深度为6 km（usgs），并在以前识别出来，并在以前发生了seemissians，并在此之前曾发生过识别，并发生在e;地震带？该活动与CA一起通过。 USGS于1981年收集了15公里的西北深层地震反射概况，这提供了一个罕见的机会，可以将地震性与美国东部的深层结构联系起来。在大约的深度。 9 km.通过将地震位置的技术与高分辨率结构成像合并，该实验旨在证明如何通过被动和主动地震技术可以利用余震，以鉴定深度的地震结构以及两种类型的区域的能量传播特征，在这些区域中，这两种信息都是罕见或不存在的。记录实验构成了通过利用新一代记录技术来成像地震过程和相关结构的原型。如果数据证明是预期的，那么该实验可能会为将来的余震研究建立新的方案。