SGER: Postseismic Response to the M = 7.9 Nov. 3, 2002 Denali Earthquake

对2002年11月3日德纳利7.9级地震的震后反应这项提案寻求为旨在测量2002年11月3日阿拉斯加德纳利断层发生的里氏7.9级地震后震后形变的实地工作提供资金。鉴于这次地震的规模及其对提高我们对震后过程和岩石圈流变学的了解的重要性，我们决定加入由阿拉斯加大学费尔班克斯大学地球物理研究所领导的实地工作，重新测量活动GPS基准并安装连续的GPS站点。普渡大学提供了3台GPS接收器，派出了3名现场操作员。实地工作由UAF协调，加州大学伯克利分校参与，联阿援助团三名工程师提供技术支持。阿拉斯加火山观测站为这次行动借出了8个GPS接收器。因此，在可能受到震后变形影响的地区，总共安装了11个连续站点。这是一项探索性的高风险作业，因为我们在实地考察时，并不确切地知道会出现什么样的地球物理信号。然而，考虑到这次地震的震级及其浅层破裂，我们从其他例子中知道，很可能发生重大的震后效应(例如1906年旧金山8.3级地震；1857年8级特琼堡地震；1946年8.2级南海道地震)。

Postseismic Response to the M = 7.9 Nov. 3, 2002 Denali EarthquakeThis proposal seeks funding for a field effort aimed at measuring the postseismic deformation following the Mw = 7.9 Denali earthquake that occurred on November 3, 2002, on the Denali fault in Alaska. Given the size of this earthquake and its significance for improving our knowledge of postseismic processes and lithospheric rheology, we decided to join a field effort led by the Geophysical Institute, University of Alaska Fairbanks to remeasure campaign GPS benchmarks and install continuous GPS sites. Purdue contributed 3 GPS receivers and sent 3 field operators. The field effort was coordinated by UAF, with the participation of UC Berkeley and the technical support of three UNAVCO engineers. The Alaska Volcano Observatory loaned 8 GPS receivers for this operation. A total of 11 continuous sites have therefore been installed in the area likely to be affected by postseismic deformation.This operation is exploratory and high risk because, at the time we went to the field, we did not know precisely what geophysical signals to expect. However, given the magnitude of the event and its shallow rupture, we knew from other examples that significant postseismic effects were very likely (e.g. 1906, M=8.3, San Francisco earthquake; 1857, M=8, Fort Tejon earthquake; 1946, M=8.2, Nankaido earthquake).