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台湾海峡西南部深地震探测剖面Pg波走时层析成像
引用本文:闫培,张艺峰,刘善虎,李普春,王笋.台湾海峡西南部深地震探测剖面Pg波走时层析成像[J].中国地震,2016,32(4):685-694.
作者姓名:闫培  张艺峰  刘善虎  李普春  王笋
作者单位:福建省地震局厦门地震勘测研究中心, 福建省厦门市盛光路669号 361021,福建省地震局厦门地震勘测研究中心, 福建省厦门市盛光路669号 361021,福建省地震局厦门地震勘测研究中心, 福建省厦门市盛光路669号 361021,福建省地震局厦门地震勘测研究中心, 福建省厦门市盛光路669号 361021,福建省地震局厦门地震勘测研究中心, 福建省厦门市盛光路669号 361021
基金项目:福建省地震局科技基金项目(SF201420)资助
摘    要:采用走时有限差分层析成像方法,利用2014年在台湾海峡西南部区域得到的3条海域测线的Pg波资料,获得了沿探测剖面沉积层上地壳基底的速度结构、基底形态和埋深。3条剖面基底深度为1.5~4.2km。基底埋深虽有一定变化,但仅在局部地区起伏较明显,显示了断裂或凹陷在上部地壳内的结构特征。通过和台湾海峡地质构造区划进行对比,反演得到的基底结构特征与地震剖面穿过区域的地质构造比较吻合,本次走时层析成像结果也为后续深部结构的反演提供了可靠的浅层速度信息。

关 键 词:台湾海峡  走时层析成像  有限差分  滨海断裂带
收稿时间:2016/4/15 0:00:00
修稿时间:2016/9/29 0:00:00

Seismic tomography in deep seismic exploration profile of the southwestern Taiwan strait from Pg wave travel time
Yan Pei,Zhang Yifeng,Liu Shanhu,Li Puchun and Wang Sun.Seismic tomography in deep seismic exploration profile of the southwestern Taiwan strait from Pg wave travel time[J].Earthquake Research in China,2016,32(4):685-694.
Authors:Yan Pei  Zhang Yifeng  Liu Shanhu  Li Puchun and Wang Sun
Institution:Research Center of Earthquake Reconnaissance in Xiamen, Earthquake Administration of FuJian Province, Xiamen 361021, Fujian, China,Research Center of Earthquake Reconnaissance in Xiamen, Earthquake Administration of FuJian Province, Xiamen 361021, Fujian, China,Research Center of Earthquake Reconnaissance in Xiamen, Earthquake Administration of FuJian Province, Xiamen 361021, Fujian, China,Research Center of Earthquake Reconnaissance in Xiamen, Earthquake Administration of FuJian Province, Xiamen 361021, Fujian, China and Research Center of Earthquake Reconnaissance in Xiamen, Earthquake Administration of FuJian Province, Xiamen 361021, Fujian, China
Abstract:The Pg travel time picked from three sea area lines,which were completed in southwestern Taiwan Strait in 2014,were used to reconstruct basement velocity structure,topoqraphy and depth of upper crust along the profile by means of finite difference layer imaging of travel time. The minimum and maximum basement depths of three profiles are between 1.5km and 4.2km. Although there are some changes in basement depth,the fluctuation is obvious only in the local area,which shows the structure of fracture or depression in the upper crust. By comparison with geological structure zonation of the Taiwan Strait,it shows no more difference between the basement structure which is obtained from inversion and the geological structure of the seismic profile across this area. The travel time tomography results also provide reliable shallow layer velocity information for follow-up inversion of the deep structure.
Keywords:Taiwan Strait  Travel time tomography  Finite difference  Littoral Fault Belt
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