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

对2002年11月3日德纳里地震M = 7.9的震后响应本提案寻求对现场工作的资助，该现场工作旨在测量2002年11月3日发生在阿拉斯加德纳里断层上的德纳里地震M = 7.9之后的震后变形。考虑到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认识的重要性，我们决定加入由阿拉斯加大学费尔班克斯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接收机，并派出了3名现场操作员。 实地工作由美国空军协调，加州大学伯克利分校参与，联刚特派团三名工程师提供技术支助。阿拉斯加火山观测站为这次行动借用了8个全球定位系统接收器。因此，在可能受震后变形影响的地区共设置了11个连续的站点，这项工作是探索性的，风险很高，因为在我们前往现场时，我们并不确切知道会有什么地球物理信号。然而，考虑到这次地震的震级和它的浅破裂，我们从其他例子中知道，很可能有重大的震后影响（例如，1906年，M=8.3，旧金山弗朗西斯科地震; 1857年，M=8，特洪堡地震; 1946年，M=8.2，南海岛地震）。

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).