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

深部板块的地震约束：深部地震的应力状态、结构及破裂特征

• 批准号: 9304553
• 负责人: Heidi Houston
• 金额: $ 9.37万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304553&HistoricalAwards=false
• 关键词: Seismic; Constraints; Deep; Slabs; Stress

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. ***

小行星9304553 这项研究是对深源地震机制的探索的继续，深源地震是地球物理学中最重要的未解决的问题之一。 这里提出的工作包括组装和分析的宽带位移波形发生在1987年至1992年期间的约150个大的深源地震。 从1982年至1986年的事件表明，P波的上升时间与震源深度的减少。 这是显示与深度相关的少数特征之一。 结果将用于测试拟议的深地震机制，包括俯冲板中的相变。 结果也将比较有限差分建模的板结构的波形和应力方向从哈佛CMT目录。 地震学和矿物物理学结果的综合将进一步评估板状构造和深源地震发生的假设。 ***