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，Chelungpu和纵向山谷断层进行了研究，该研究在1999年和1951年的大地震中破裂，以解决复发性断层行为以及破裂模式的时间变异性。在Chelungpu和纵向山谷断层上的破裂时间序列的获取提供了串行断层破裂和断层相互作用的物理模型的限制。 这些结果通过考虑导致剧烈地震的物理过程，包括相邻断裂破裂的相互作用，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对chelungpu沿chelelungpu的层状层次的经历，使地震动的探索表征和地震行为。例如，如果1999年的地震的复发频率要少得多，那么其他纬度的其他结构将必须在应变缓解中发挥重要作用。这些调查的结果对理解各个断层和山区建筑的应变减轻的身体过程有影响。末端会员的假设范围从不公平或随机复发到高度聚集的行为，正在使用沿Chelungpu和邻近反向断层获得的地震时间历史进行测试。该项目还表征了纵向山谷断层的活动断层。确定少数沿海海洋露台的海岸线角度的高度正在限制沿纵向山谷的千禧一代。 Shiouguluan河沿岸的河流露台的地质映射和约会提供了纵向山谷与东沿海地区之间的时间平均升高率。