摘要
基于新疆区域地震台网记录的地震观测报告,采用有限差分层析成像方法反演新疆天山中东段地区的地壳P波速度结构,获得了2012年新源和静6.6级地震前后该区域12km和24km深度处半年尺度的P波速度结构的时间演化过程。结果表明,12km深度处震前震源区及附近区域P波速度差在空间上形成NNE向变化剧烈的高值异常区,异常幅度达0.3km/s。这种明显的速度差异表明,将半年尺度不同时间段相同深度的P波速度进行差分析,能较好地反映一定区域内地壳介质特性的变化。
Based on the phase observation report from Xinjiang regional seismic network, we use the finite difference tomography method to invert the P-wave velocity structure of the central and eastern segments of Xinjiang Tianshan mountain. We then acquire the half-annual scale for the evolution of P wave velocity structure before and after the Xinyuan-Hejing earthquake. The results show that the zone of high P-wave velocity difference is produced before the earthquake in the epicenter and the surrounding area at a depth of 12 km, with an anomaly amplitude up to 0.3 km/s. The apparent difference in speed reflects changes of the crust medium by half-annual scale of different time in the same depth of P-wave velocity differential analysis.
出处
《大地测量与地球动力学》
CSCD
北大核心
2017年第5期492-496,530,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局测震台网青年骨干培养专项(20140327)
中国地震局"监测
预报
科研"三结合课题(163105)
新疆地震科学基金(201506)~~
关键词
新源和静6.6级地震
新疆天山中东段
有限差分层析成像方法
P波速度差
Xinyuan-Hejing Ms 6. 6 earthquake
central and eastern segments of Xinjiang Tianshan mountain
finite difference tomography method
P-wave velocity different
