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新疆天山地区的波速比异常分析
张琳琳,高朝军
作者单位
张琳琳 新疆维吾尔自治区地震局, 乌鲁木齐市新市区科学二街338号 830011 
高朝军 新疆巴里坤地震台, 哈密 839200 
摘要:
收集整理了新疆地震台网2009~2014年的地震观测报告数据,利用多台和达法计算了新疆天山地区中小地震的波速比及其背景值,为了突出异常变化,分析了研究区内的波速比扰动值变化,同时回溯了天山地区7次中强地震,结果表明:(1)天山地区波速比的背景值为1.70左右,自2013年开始,波速比的低值异常主要集中在天山中东段及普昌断裂附近;(2)2011~2013年研究区内4次MS5.0以上地震前,震中位置波速比扰动值多数处于低值状态;(3)7次中强地震前,震中及其附近区域波速比低值的地震事件占相应时段内总事件的比率大于60%,研究区内中强地震前波速比呈低值状态较明显。
关键词:  地震观测报告  多台和达法  波速比扰动值  天山地区
DOI:
分类号:
基金项目:This project was sponsored by the Specific Fund of Fundamental Research, Institute of Geophysics, China Earthquake Administration (DQJB16B19).
Analysis of the Wave Velocity Ratio Anomalies in the Tianshan Region of Xinjiang
Zhang Linlin,Gao Chaojun
Abstract:
Based on the seismic observation report data provided by the Xinjiang Digital Seismic Network from 2009 to 2014, we calculate the wave velocity ratio and its background value for medium and small earthquakes by using the multi-station method in Tianshan, Xinjiang. This paper analyzes the variation of the wave velocity ratio disturbance value to highlight the abnormal, and also back-traces 7 moderate earthquakes at the research area. The results show that:(1) the background value of the wave velocity ratio is almost 1.70, the wave velocity ratio obviously decreases in the middle-eastern part of Tianshan and the region near the Puchang fault; (2) the wave velocity ratio disturbance value is mostly low in the epicenter before four earthquakes of M ≥ 5.0 from 2011 to 2013 in the study area; (3) before 7 moderate strong earthquakes, the earthquake events with low value of the wave velocity ratio account for over 60% of corresponding total events near the epicenters, and the low value of the wave velocity ratio is relatively obvious before moderate earthquakes.
Key words:  Seismic observation report  Multi-station method  The wave velocity ratio disturbance value  Tianshan region