A Comprehensive Analysis of the 1994 Java Tsunami Earthquake and Its Implications for our Understanding of Shallow Subduction Zone Dynamics and Source Processes

1994年爪哇海啸地震的综合分析及其对我们理解浅俯冲带动力学和震源过程的启示

• 批准号: 9909352
• 负责人: Hiroo Kanamori
• 金额: $ 3.98万
• 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: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2002-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909352&HistoricalAwards=false
• 关键词: Comprehensive; Analysis; 1994; Java; Tsunami

This project proposes to perform a detailed investigation of the 1994 Java earthquake and its larger aftershocks, by using seismsc waveforms and other geophysical and geological datasets. The 1994 Java earthquake was a large shallow subduction zone thrust-earthquake that was followed by a tsunami. Preliminary work shows a large discrepancy between the short period and long period behavior of the main shock in terms of moment rate and directivity. The aftershock sequence is highly unusual because of the normal faulting nature of almost all of its mechanisms, in contrast with the thrust main shock mechanism. By performing source inversions for the Java events, determining a detailed rupture model of the main shock, relocating aftershocks, investigating the origin of the aftershock pattern, and combining these seismic observations with tectonic datasets to develop a model of this unusual event, this project will be able to significantly enhance the understanding of how shallow subduction zones work.

该项目拟利用地震波形和其他地球物理和地质数据集，对1994年爪哇地震及其较大余震进行详细调查。 1994年的爪哇地震是一次大型浅俯冲带逆冲地震，随后发生海啸。 初步工作表明，主震在矩率和方向性方面的短周期和长周期行为之间存在很大差异。 余震序列是非常不寻常的，因为几乎所有的机制的正常断层性质，与逆冲主震机制。 通过对爪哇事件进行震源反演，确定主震的详细破裂模型，重新定位余震，调查余震模式的起源，并将这些地震观测与构造数据集相结合，开发出这一不寻常事件的模型，该项目将能够显着提高对浅俯冲带如何工作的理解。