Global Studies of Seismicity and Deformation at Convergent Margins Due to Heterogeneous Coupling

本研究包括对耦合俯冲段及其周围（上覆板块、海底和俯冲板块）地震活动性的继续研究，以了解沿逆冲界面耦合的强度和非均质性。具体研究领域为：1)研究主逆冲带非均质地震耦合与海底和上板块地震活动性的关系；2)中深度下降板块地震活动性及其与耦合关系的解释；3)地震活动性与俯冲带及其附近库仑应力变化量（剪切减摩擦系数乘以法向应力变化）变化的相关性；(4)研究海沟附近和向外隆起方向的挤压地震作为逆冲界面地震旋回成熟的信号。这项研究是国家减少地震危害计划的一个组成部分。

9614431Rice This research involves a continuation of the study of seismicity in coupled subduction segments and their surroundings (overriding plate, sea floor and subducting slab) to understand the strength and heterogeneity of coupling along the thrust interface. Specific areas of investigation are: 1) investigation of the relations between heterogeneous seismic coupling along the main thrust zone and seismicity in the sea floor and upper plate areas; 2) explanation of seismicity in the descending slab at intermediate depths and its relation to coupling; 3) correlation of seismicity with changes in a Coulomb measure of stress change (shear minus friction coefficient times normal stress change) in a subduction zone and its vicinity; and 4) investigation of compressional earthquakes in zones near the trench and towards the outer rise as signals of the maturity of the earthquake cycle of the thrust interface. This research is a component of the National Earthquake Hazard Reduction Program.