Seismic Constraints on Deep Slabs: Stress State, Structure,and Rupture Characteristics of Deep Earthquake

这项研究是寻找深层地震机制的继续，这是地球物理学中最重要的未解决问题之一。本文提出的工作包括对1987-1992年发生的约150次大深地震的宽带位移波形进行组装和分析。1982- 1986年的地震事件显示P波上升次数随震源深度的增加而减少。这是显示与深度相关的少数特征之一。研究结果将用于测试深层地震的机制，包括俯冲板块的相变。结果还将与哈佛CMT目录中关于波形和应力方向的板结构有限差分模型进行比较。地震和矿物物理结果的整合将进一步评价板构造和深部地震发生的假设。＊＊＊

9304553 Houston This research is a continuation of the search for a mechanism for deep earthquakes, one of the most important unresolved problems in geophysics. The work proposed here includes the assembly and analysis of broadband displacement waveforms of about 150 large deep earthquakes that occurred during 1987-1992. Events from 1982- 1986 showed a decrease in rise times of the P wave with earthquake origin depth. This is one of the few characteristics that shows a correlation with depth. The results will be used to test proposed mechanisms for deep earthquakes including phase transformations in the subducting slab. The results will also be compared with finite-difference modeling of the slab structure on waveforms and stress orientations from the Harvard CMT catalog. Integration of seismological and mineral physics results will further the evaluation of hypotheses of slab structure and deep earthquake generation. ***