Collaborative Research: Modeling of 3-D Viscoelastic Stress Transfer in the California Crust: Implications for Earthquake Triggering and Seismic Hazard Migration

合作研究：加州地壳 3-D 粘弹性应力传递建模：对地震触发和地震灾害迁移的影响

• 批准号: 0003888
• 负责人: Jian Lin
• 金额: $ 4.38万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003888&HistoricalAwards=false
• 关键词: Collaborative; Research; Modeling; Viscoelastic; Stress

Burgmann Lin The investigators propose to perform a set of 3-D numerical modeling experiments, focusing on three recent California earthquake sequences: (1) the 1992 Landers earthquake, its potential role in triggering the 1999 Hector Mine event, and their combined effects on the southern San Andreas fault; (2) the 1983 Coalinga and 1985 Kettleman Hills blind-thrust quakes and their potential effects on delaying seismic rupture on the Parkfield segment of the San Andreas fault; and (3) the most recent sequence of historical quakes in the Los Angeles region, including the 1933 Long Beach, 1952 Kern County, 1971 San Fernando, 1987 Whittier Narrows, and 1994 Northridge events, and their implications on seismic hazard migration in the Los Angeles region. Recently the investigators have successfully developed preliminary 3-D viscoelastic models for a small subset of the above California sequences. This project will allow them to carry out a much more comprehensive investigation through (1) extending the models to include all relevant quakes, (2) verifying the robustness of the model solutions and their sensitivity to assumptions in crustal rheology and fault geometry, and (3) comparing the model results with geodetic observations. Results of this modeling investigation, together with advances in space geodesy and seismic monitoring capabilities, should provide us with a much clearer understanding of the seismic properties of the California crust, the mechanisms of earthquake triggering, and the regularities in seismic hazard migration in California. This is a collaborative project between the UC Berkeley (Andy Freed) and WHOI (Jian Lin). Freed will lead 3-D modeling experiments using the I-deas viscoelastic modeling code, while Lin will lead tasks of comparing the I-deas solutions to independent results from the GENPro boundary-element code and analyzing the geodetic and earthquake data in the study regions to constrain modeling.

研究人员提议进行一组3-D数值建模实验，重点关注三个最近的加利福尼亚地震序列：（1）1992年Landers地震，其在触发1999年Hector矿山事件中的潜在作用，以及它们对南部San Andreas断层的综合作用； （2）1983年的Coalinga和1985年的Kettleman Hills盲人地震及其对延迟地震破裂对圣安德烈亚斯（San Andreas）断层帕克菲尔德（Parkfield）部分的潜在影响； （3）洛杉矶地区的最新历史地震序列，包括1933年的长滩，1952年克恩县，1971年，圣费尔南多，1987年，惠提尔·诺罗斯（Whittier Narrows）和1994年的诺斯里奇（Northridge）事件，及其对洛杉矶地区的地震危险迁移的影响。 最近，研究人员成功地开发了上述加利福尼亚序列的一小部分的初步3-D粘弹性模型。 该项目将使他们能够通过（1）将模型扩展到包括所有相关地震，（2）验证模型解决方案的鲁棒性及其对地壳流变性几何学和（3）比较模型结果与地球观测的敏感性的鲁棒性。 这项建模研究的结果，以及太空测量和地震监测能力的进步，应该使我们对加利福尼亚地壳的地震特性，地震触发机理以及加利福尼亚州的地震危害迁移的规律性有更清晰的了解。 这是加州大学伯克利分校（安迪·弗里·弗里）和哇（Jian Lin）之间的一个合作项目。 Freed将使用I-DEAS粘弹性建模代码领导3-D建模实验，而LIN将领导将I-DEAS解决方案与GenPro边界元素代码的独立结果进行比较，并分析研究区域中的地球和地震数据以约束建模。