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.

Burgmann Lin 研究人员建议进行一组 3D 数值模拟实验，重点关注加利福尼亚州最近的三个地震序列：(1) 1992 年兰德斯地震，其在触发 1999 年赫克托矿事件中的潜在作用，以及它们对南圣安德烈亚斯断层； (2) 1983 年的 Coalinga 和 1985 年的 Kettleman Hills 盲目逆冲地震及其对延迟圣安德烈亚斯断层 Parkfield 段地震破裂的潜在影响； (3) 洛杉矶地区最近发生的一系列历史地震，包括 1933 年长滩地震、1952 年克恩县地震、1971 年圣费尔南多地震、1987 年惠蒂尔海峡地震和 1994 年北岭地震，及其对洛杉矶地区地震灾害迁移的影响安吉利斯地区。 最近，研究人员成功地为上述加州序列的一小部分开发了初步的 3D 粘弹性模型。 该项目将使他们能够通过以下方式进行更全面的调查：（1）扩展模型以包括所有相关的地震，（2）验证模型解的稳健性及其对地壳流变学和断层几何假设的敏感性，以及（ 3）将模型结果与大地测量结果进行比较。 这一模型研究的结果，加上空间大地测量学和地震监测能力的进步，将使我们对加州地壳的地震特性、地震触发机制以及加州地震灾害迁移的规律有更清晰的了解。 这是加州大学伯克利分校（Andy Freed）和 WHOI（Jian Lin）之间的合作项目。 Freed 将领导使用 I-deas 粘弹性建模代码的 3-D 建模实验，而 Lin 将领导将 I-deas 解决方案与 GENPro 边界元代码的独立结果进行比较以及分析研究区域的大地测量和地震数据的任务来约束建模。