摘要
在使用APP++扫描得到的川滇地区地震目录数据的基础上,利用波形互相关得到的走时差,通过双差层析成像方法进一步提高了定位精度,并反演了该地区地壳的三维P波和S波速度结构。结果显示:重定位后的地震位置分布很好地刻画了相关断层的形态;浅层的速度结构能够很好地吻合区域内的断层分布,深部的速度结构反映了川滇菱形块体地壳流的可能图像。
Using earthquake catalog and travel time difference data obtained from seismic dataset in Sichuan-Yunan region by APP++and cross-correlation,we refine the earthquake locations and inverse the three-dimensional P-wave and S-wave velocity structure of the crust in the region through double-difference tomography.The earthquake distribution after relocation well describes the related fault geometry;the velocity structure in shallow depth can well match the distribution of the faults in the region,and the velocity structure in deep roughly reflects the crustal flow feature in Sichuan-Yunnan rhombic block.
作者
蒋一然
宁杰远
李春来
JIANG Yiran;NING Jieyuan;LI Chunlai(School of Earth and Space Sciences,Peking University,Beijing 100871,China;Hebei Hongshan Geophysical National Observation and Research Station,Xingtai 054000,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
出处
《华北地震科学》
2021年第2期17-26,共10页
North China Earthquake Sciences
基金
中国地震科学实验场项目“川滇交界东部地区断层精细结构”(2019CSES0111)
国家重点研发计划专项课题(2018YFC1503400)。
关键词
自动拾取目录
双差地震层析成像
川滇地区
automatic picking
Double-Difference Seismic Tomography
Sichuan-Yunan region
