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

这项研究涉及对耦合俯冲段及其周围(逆冲板块、海底和俯冲板块)的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。具体的研究领域是：1)研究沿主冲断带的非均匀地震耦合与海底和上板块地区地震活动的关系；2)解释中深度下降板的地震活动及其与耦合的关系；3)地震活动与俯冲带及其附近的应力变化(剪切减去摩擦系数乘以正常应力变化)的库仑量度变化的相关性；4)研究海沟附近和外部隆起地区的挤压地震，作为逆冲界面地震周期成熟的信号。这项研究是国家减少地震灾害计划的一部分。

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.