Paleoseismicity and Seismotectonics in the Puget Sound Region from Geologic and Geophysical Studies of Puget Sound and Nearby Lakes

来自普吉特海湾及附近湖泊的地质和地球物理研究的普吉特海湾地区的古地震活动和地震构造

• 批准号: 9418465
• 负责人: Robert Karlin
• 金额: $ 24.33万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-03-01 至 1999-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418465&HistoricalAwards=false
• 关键词: Paleoseismicity; Seismotectonics; Puget; Sound; Region

9418465 Karlin This research is to conduct geological, geophysical, and geotechnical studies of Puget Sound, Lake Washington, and other lakes in the Puget Lowland to map the submarine expression of large faults, map the distribution of subaqueous landslides,and obtain sedimentary records of earthquake history during the Holocene. In Puget Sound, seismic reflection profiling, side-scan swath surveying, and coring operations will be conducted to examine the Seattle Fault system for evidence of recent movement and trace its submarine expression through Lake Sammamish, Lake Washington, Puget Sound to Hood Canal. Zones of subaqueous slumping will be mapped, dated and analyzed to determine if they are of seismogenic origin. On selected submarine landslides in Lake Washington, existing geotechnical information will be combined with geophysical mapping and core analysis to model minimum accelerations (hence, earthquake intensities) needed to trigger slope failure. The sedimentary earthquake record obtained from Lake Washington will be verified and extended by examining anomalous disturbances in sedimentary sequences in other lakes in the region. This work should help in estimates of seismic risk in the Seattle-Bellevue-Kirkland-Everett-Tacoma area. This research is a component of the National Earthquake Hazard Reduction Program. *** ??

9418465 Karlin 这项研究将对普吉特湾、华盛顿湖和普吉特低地的其他湖泊进行地质、地球物理和岩土工程研究，以绘制大型断层的海底表现图，绘制水下滑坡的分布图，并获得地震的沉积记录全新世时期的历史。 在普吉特湾，将进行地震反射剖面、侧扫带测量和取芯作业，以检查西雅图断层系统，寻找近期运动的证据，并通过萨马米什湖、华盛顿湖、普吉特湾到胡德运​​河追踪其海底表现。 将对水下塌陷区进行测绘、测定日期和分析，以确定它们是否具有地震起源。 在华盛顿湖选定的海底滑坡上，现有的岩土技术信息将与地球物理测绘和岩心分析相结合，以模拟触发斜坡破坏所需的最小加速度（因此，地震强度）。 从华盛顿湖获得的沉积地震记录将通过检查该地区其他湖泊沉积序列的异常扰动进行验证和扩展。 这项工作应该有助于估计西雅图-贝尔维尤-柯克兰-埃弗里特-塔科马地区的地震风险。 这项研究是国家地震减灾计划的一部分。 *** ??