摘要
地震P波震相到时与初动极性的精确读取是地震资料分析处理的重要步骤之一.本研究采用了一种新的高精度自动确定地震波P波震相到时与初动极性的概率分布的方法(POI方法,后同),在此基础上研究开发了一套自动化小震震源机制解的反演流程,并将其应用在云南小江断裂带周边区域的小震震源机制和构造应力场反演中.得到的震源机制与应力场反演结果与前人的研究一致,且与区域GPS观测结果和构造背景吻合度较好,显示该方法具有良好的应用前景,为高效分析密集台阵地震观测资料,开展小震震源参数测量与区域应力场反演提供了新的研究思路和技术手段.
Precise phase picking and polarity determination of P wave is one of the important process in seismic data analysis.This study adopts a new automatic method that calculates probability of arrival time and polarity based on order statistics and information theory(POI).Based on this method,we develop an automatic inversion process for small earthquakes and apply it to focal mechanism determination and stress field inversion in Xiaojiang fault zone of Yunnan.The focal mechanism solutions and stress field orientation are consistent with previous studies,GPS observation and tectonic background,indicating that our method is applicable.It provides new technical strategy and scientific approach for seismic data analysis,source parameter estimation and stress field deduction from dense array data with high efficiency.
作者
裴玮来
周仕勇
PEI WeiLai;ZHOU ShiYong(School of Earth and Space Sciences,Peking University,Beijing 100871,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期992-1005,共14页
Chinese Journal of Geophysics
基金
国家重点研发计划(2018YFC1503401-01)资助。
关键词
震相拾取
P波初动极性
顺序统计量
信息论
震源机制解
构造应力场
Phase detection
P wave first-motion polarity
Maximum order statistics
Information theory
Focal mechanism
Tectonic stress field
