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摘要: 利用观测走时、走时残差和波形互相关方法获得走时残差，采用双差地震层析方法对1996年6月1日天祝5.2级地震后布设的微震台网资料进行处理，获得了台网下方上地壳三维速度结构的基本特征和地震绝对位置的空间展布特征，并由此勾画出区域活动断裂在深部的延伸情况. 地震层析结果表明, 研究区上地壳速度结构在纵向和横向上具有明显的非均匀性，地表附近呈现出从南到北高低速相间的速度结构特征. 地震主要发生在P波高速度或高低速过渡区域，代表坚硬岩层的壳内高速体为强震的孕育和发生提供了重要基础. 祁连山逆冲断裂1927年5月23日古浪8.0级地震的发生与祁连山逆冲断裂下方高速度区有着必然的联系.Abstract: Double-difference seismic tomography method, which makes use of both absolute and relative arrival times of seismic phases, is adopted to image the velocity structure beneath seismic stations and relocate aftershocks of the 1 Jun 1996 Tianzhu MW5.2 earthquake recorded by a surveillance network of 6 digital seismic stations. Depth extent of active faults is deduced from the velocity structure and relocated earthquakes. The imaged velocity distribution shows that in upper crust there are obvious heterogeneity both horizontally and vertically. It reveals as alternative high and low velocity zones near surface along a N-S AAprime;profile. The earthquakes took place mainly in high velocity zones and high to low velocity transition zones. High velocity body represented by hard rock is crucial for preparation and occurrence of large events. The occurrence of 1927 Gulang M8.0 earthquake was inevitably related to a high velocity zone under Qilianshan thrust.
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期刊类型引用(4)
1. XU Jixiang，XU Chong，HE Xiangli，WEN Boyu，GE Keshui，BAI Yuzhu. Spatial Distribution of Seismic Landslides in the Areas of 1927 Gulang M8. 0 Earthquake. Earthquake Research in China. 2020(01): 5-28 . 
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2. 曹颖，付虹，张海江，陈余宽，黄江培. 云南普洱糯扎渡水库蓄水前后P波速度结构变化特征. 地震学报. 2018(06): 701-718+831 . 本站查看
3. 曹颖，黄江培，付虹. 云南小湾水库蓄水后P波速度结构的双差地震层析成像研究. 中国地震. 2018(04): 652-666 . 百度学术
4. 刘白云，曾文浩，袁道阳，李秋红，陈文凯. 1927年古浪8级大地震断层面参数和滑动性质. 地震地质. 2015(03): 818-828 . 百度学术
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