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据地壳速度结构推测1668 年山东郯城8½级大地震震中
李清河1, 张元生2, 鲍海英1, 金淑梅1
1.江苏省地震局,南京市卫岗3 号210014;2.中国地震局兰州地震研究所,兰州730000
摘要:
分析了1668 年山东郯城8?级大震区附近地壳深部结构特点,以天然地震走时层析成像得到的三维地壳速度结构,主要以中地壳低速层和莫霍面深度为依据,对34°~36°N,118°~119°E区间按经、纬度和斜向扫描,得到相应地壳速度剖面。对比结果,获得与该地震深部结构特点一致的区域,推测震中范围位于34.8°~35.2°N,118.2°~118.7°E,较合理的震中位于35.1°N,118.6°E,震源深度约20km。
关键词:  1668年山东地震  地壳速度结构  速度-深度剖面扫描
DOI:
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基金项目:国家自然科学基金( 40974031) ,江苏省科技发展项目( BE2009691) 资助
Crust velocity structure inference of the epicenter of M8½ earthquake at Tancheng,Shandong,China,in 1668
Li Qinghe1, Zhang Yuansheng2, Bao Haiying1, Jin Shumei1
1.Earthquake Administration of Jiangsu Province,Nanjing 210014,China;2.Lanzhou Institute of Seismology,Lanzhou 730000,China
Abstract:
The deep structure features around the Tancheng M8? earthquake in 1668 has been analyzed in the paper. On the basis of the crustal velocity structure of seismic traveltime tomography,especially the low velocity layer of middle crust and Moho depths,we scanned the deep velocity distribution in the area of 34° ~ 36°N,118° ~ 119°E along latitude,longitude and deflection direction,and located the area with the feature in agreement with the deep structure features around the Tancheng M8 earthquake in 1668. The location is 34. 8° N ~ 35. 2° N, 118. 2°E ~ 118. 7°E. The suitable location is 35. 1°N,118. 6°E with a depth of 20km.
Key words:  Epicenter of the Tancheng M8½ earthquake occurred in 1668  Crustal velocity structure  Scan of velocity-depth profiles