| 2013年岷县漳县MS6.6地震前后南北地震带北段面波速度变化特征 |
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| 引用本文： | 严珊,杨立明,周龙泉,张辉,王芃.2013年岷县漳县MS6.6地震前后南北地震带北段面波速度变化特征[J].西北地震学报,2016,38(3):423-430. |
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| 作者姓名： | 严珊 杨立明 周龙泉 张辉 王芃 |
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| 作者单位： | 中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震台网中心, 北京 100045,中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局地震预测研究所, 北京 100035 |
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| 基金项目： | 中国地震局地震科技星火计划攻关项目(XH15042);甘肃省科技计划(145RJZA186);国家自然科学基金项目(41304048);"十二五"国家科技支撑项目(2012BAK19B02-01) |
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| 摘 要： | 基于南北地震带北段94个固定地震台站2013年1-9月的连续波形资料,利用背景噪声方法和层析成像技术反演该地区在2013年7月22日甘肃岷县漳县MS6.6地震前后不同时间段、两个月相同时间窗长的瑞利面波速度结构与波速演化。相速度成像结果表明:岷县漳县地震前5-6月相对于3-4月,临潭-宕昌断裂带及周边地区出现了波速降低的现象,而震后8-9月相对于5-6月波速逐渐恢复升高,这说明在岷县漳县地震前两个月出现了波速低值异常,并且在低速异常区域的边界处发生了此次地震。
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| 关 键 词： | 南北地震带北段 甘肃岷县漳县MS6.6地震 背景噪声 层析成像 速度结构 临潭-宕昌断裂带 波速低值异常 祁连山中段 |
| 收稿时间： | 2015/10/20 0:00:00 |
Variation Characteristics of Surface Wave Velocity along NorthSegment of North-South Seismic Belt before and after2013 Minxian-Zhangxian MS6.6 Earthquake |
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| YAN Shan,YANG Li-ming,ZHOU Long-quan,ZHANG Hui and WANG Peng.Variation Characteristics of Surface Wave Velocity along NorthSegment of North-South Seismic Belt before and after2013 Minxian-Zhangxian MS6.6 Earthquake[J].Northwestern Seismological Journal,2016,38(3):423-430. |
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| Authors: | YAN Shan YANG Li-ming ZHOU Long-quan ZHANG Hui and WANG Peng |
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| Institution: | Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,Gansu,China,Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,Gansu,China,China Earthquake Networks Center,Beijing 100045,China,Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,Gansu,China and Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China |
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| Abstract: | Based on background noise and tomography methods,in this paper,we investigated the continuous waveform records of 94 fixed seismic stations in the northern segment of the north-south seismic belt from January to September,2013.In doing so,we obtained the velocity structure and evolution of the Rayleigh waves of this area,at different times in the same two-month period before and after the Minxian-Zhangxian MS6.6 earthquake on July 22,2013.The phase velocity tomography results show that before the earthquake,in May-June,the wave velocity along the Lintan-Tanchang fault zone and its surrounding areas reduced relative to that in March-April.However,after the earthquake,in August-September,the wave velocity along the Lintan-Tanchang fault zone and its surrounding areas was restored by rising to the level of May-June.These results indicate that in the two months before the Minxian-Zhangxian MS6.6 earthquake,the velocity exhibited low-value anomalies,and the earthquake occurred at the boundary of the low-velocity anomaly region. |
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| Keywords: | north segment of the north-south seismic belt Minxian-Zhangxian MS6 6 earthquake background noise tomography velocity structure Lintan-Tanchang fault zone middle segment of the Qilian Mountains |
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