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基于微动技术探测盆地浅部地层速度结构1
引用本文:李细兵,范小平.基于微动技术探测盆地浅部地层速度结构1[J].震灾防御技术,2014,9(4):821-828.
作者姓名:李细兵  范小平
作者单位:江苏省地震局,南京 210014;江苏省地震局,南京 210014
基金项目:江苏省社会发展项目(BE2010753);江苏省地震局青年基金项目(13405)
摘    要:本文介绍了利用微动技术探测地表浅层速度结构的方法,并在江苏常州地区一个凹陷盆地内进行了一次野外台阵观测试验,采集场地数据的质量良好.利用空间自相关法得到了不同半径下的自相关函数曲线,该场地的自相关函数显示,对于半径较大的台阵,其自相关系数较好;根据自相关函数提取了场地的频散曲线.通过设定初始模型,利用邻域反演算法得到了该场地的基本速度结构和各层深度分布范围;最后通过与场地附近的人工地震剖面进行对比分析表明,试验结果所揭示的土层结构与浅层人工地震勘探解释结果接近.

关 键 词:微动技术  速度结构  频散曲线  邻域算法
收稿时间:2014/3/20 0:00:00

Detection of Shallow Basin Velocity Structure Based on the Microseism Technology
Li Xibing and Fan Xiaoping.Detection of Shallow Basin Velocity Structure Based on the Microseism Technology[J].Technology for Earthquake Disaster Prevention,2014,9(4):821-828.
Authors:Li Xibing and Fan Xiaoping
Institution:Li Xibing;Fan Xiaoping;Earthquake Administration of Jiangsu Province;
Abstract:We introduce the detective method of shallow basin velocity structure based on the microseism technology.A trial test is applied in open field and the data acquired is well.By using the space auto-correlation (SPAC) method of microseism technology,we obtain the auto-correlation ratio of different radius from the test.It is shown that the auto-correlation ratio is well when the radius ofring is large.Phase velocity curve with frequency is calculated from autocorrelation ratio.The model including velocity and depth parameters was inversed by using the neighborhood algorithm.Comparing with the interpretation of seismic reflection profile,the depth parameter of inversion result is much closed to that from the seismic reflection profile.
Keywords:Microseism technology  Velocity structure  Dispersion curve  Neighbourhood algorithm
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