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

SGER：2002 年 11 月 3 日 M = 7.9 迪纳利地震的震后响应

• 批准号: 0312427
• 负责人: Eric Calais
• 金额: $ 1.05万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-15 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0312427&HistoricalAwards=false
• 关键词: SGER; Postseismic; Response; 7.9; Nov.

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).

对2002年11月3日发生在阿拉斯加迪纳利断层的里氏7.9级地震的震后反应本提案为一项旨在测量2002年11月3日发生在迪纳利断层上的里氏7.9级地震的震后形变的实地工作寻求资金。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知识的重要性，我们决定加入由阿拉斯加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，并派出了3名现场操作员。实地工作由联合空军协调，加州大学伯克利分校参与，联安援助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出了8台GPS接收器。因此，在可能受震后变形影响的地区，总共安装了11个连续站点。这种操作是探索性的，风险很高，因为当我们进入现场时，我们并不确切地知道会发生什么地球物理信号。然而，考虑到这次地震的震级和浅层破裂，我们从其他例子中知道，很可能发生重大的震后影响（例如，1906年，M=8.3，旧金山地震；1857年，M=8， Tejon堡地震；1946年，M=8.2，南海道地震）。