Collaborative Research: Patterns of Serial Fault Rupture in Taiwan

合作研究：台湾连续断层破裂模式

• 批准号: 0208505
• 负责人: Kerry Sieh
• 金额: $ 15.9万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0208505&HistoricalAwards=false
• 关键词: Collaborative; Research; Patterns; Serial; Fault

Kerry SiehEAR-0208505This project undertakes studies of two active fault systems in Taiwan, the Chelungpu and Longitudinal Valley faults, which ruptured during large earthquakes in 1999 and 1951, in order to address recurrence fault behavior and the temporal variability of rupture modes. Acquisition of rupture time series on the Chelungpu and Longitudinal Valley faults provide constraints on physical models of serial fault rupture and fault interactions. These results bear on seismic hazard analysis, by considering the physical processes that lead to an earthquake, including the interaction of adjacent fault ruptures, the effect of prior ruptures on a fault, the influence of geologic structure and fault geometry on rupture termination and aseismic versus seismic behavior.Paleoseismic studies along the Chelungpu fault are characterizing its earthquake recurrence and displacement history. For example, if the recurrence of 1999-like earthquakes is far less frequent, then other structures at the same latitude would have to play an important role in strain relief. Results from these investigations have implications for understanding the physical processes of strain relief on individual faults and of mountain building. End-member hypotheses, ranging from unpatterned or random recurrence to highly clustered behavior, are being tested using earthquake time histories obtained along the Chelungpu and adjacent reverse faults.The project also characterizes the active faults of the Longitudinal Valley faults. Determining the elevations of shoreline angles for a select handful of coastal marine terraces is constraining the millennial rates along the Longitudinal Valley. Geologic mapping and dating of the fluvial terraces along Shiouguluan River are providing the time-averaged uplift rates between the Longitudinal Valley and the eastern coastal region.

Kerry SiehEAR-0208505该项目对台湾的两个活动断层系统（车笼埔断层和纵谷断层）进行研究，这两个断层在 1999 年和 1951 年的大地震中破裂，以解决复发断层行为和破裂模式的时间变化问题。车笼铺断层和纵谷断层破裂时间序列的获取为连续断层破裂和断层相互作用的物理模型提供了约束。 这些结果通过考虑导致地震的物理过程，包括相邻断层破裂的相互作用、先前破裂对断层的影响、地质结构和断层几何形状对破裂终止的影响以及抗震与地震的影响，对地震危险性分析产生影响。地震行为。沿车笼铺断层的古地震研究正在表征其地震复发和位移历史。例如，如果类似 1999 年的地震再次发生的频率要低得多，那么同纬度的其他结构就必须在应力消除中发挥重要作用。这些调查的结果对于理解单个断层应变消除和造山的物理过程具有重要意义。端元假设，从无模式或随机复发到高度集群行为，正在使用沿车笼铺和邻近逆断层获得的地震时间历史进行测试。该项目还描述了纵谷断层的活动断层的特征。确定少数沿海海洋阶地的海岸线角度高度限制了纵向山谷沿线的千禧年比率。秀姑峦河沿线河流阶地的地质测绘和测年提供了纵谷和东部沿海地区之间的时间平均抬升率。