Faulting Processes of Large Earthquakes in the Baikal Rift Zone and Implications for Rift Development

该提案寻求资金，用于研究1950至1967年间贝加尔裂谷带发生的6次6.5级至7.9级大地震的断裂过程。这将通过区域和远震体波的波形建模和面波分析来实现。对断层几何形状和破裂过程的其他限制将从现有的对裂谷的地质和地球物理研究中获得。感兴趣的地震发生在裂谷区域，这些区域同时处于不同的演化阶段，从成熟的中央裂谷地堡到东经121度的早期裂谷，地表没有出现伸展特征。研究裂谷每个区域内的断裂过程将有助于更好地了解裂谷中的断裂是如何演化的，并将这些区域与处于不同演化阶段的其他大陆裂谷进行比较。此外，对1957年西伯利亚7.9级地震的分析将为大陆裂谷其他地区的地震危险性评估提供重要信息。这是自1900年以来在板内背景下发生的最大地震之一。

This proposal seeks funding to study the faulting processes of six large earthquakes with magnitudes between 6.5 and 7.9 that have occurred with the Baikal rift zone between 1950 and 1967. This will be accomplished through waveform modeling of regional and teleseismic body waves and surface wave analysis. Additional constraints on fault geometry and the rupture process will be obtained from available geological and geophysical studies of the rift. The earthquakes of interest occurred in regions of the rift that are contemporaneously in different stages of evolution, ranging from the well established central rift graben to incipient rifting at 121 degrees E, where no extensional features appear at the surface. Study of the faulting processes within each region of the rift will lead to a better understanding of how faulting in a rift evolves and will allow comparison of these regions with other continental rifts that are in different stages of evolution. In addition, analysis of the 1957 M=7.9 Muya, Siberia earthquake, one of the largest earthquakes to have occurred in an intraplate setting since 1900, will provide important information for seismic hazard assessment in other regions of continental rifting.