| 北京地区地震参数与速度结构的联合测定 |
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| 引用本文： | 赵仲和.北京地区地震参数与速度结构的联合测定[J].地球物理学报,1983,26(2):131-139. |
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| 作者姓名： | 赵仲和 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 为提高北京遥测地震台网的地震参数测定能力,对北京地区（38°-41°N,114°-119°E）建立了一个新的地震波速度模型MDBJ81。这一模型有四个水平层置于均匀半空间之上,第一层分成三块,以反映该地区浅部结构的横向差异及地形起伏效应。在联合测定地震参数和速度结构过程中,其可调整速度模型参数包括:各层中的平均P波速度,各层层顶深度,第一层三块厚度以及平均P波S波速度比。通过分离参数,避免了求解大型方程组。 最后求解中使用了北京台网1979年记录的43个地震,共836个P波及S波震相到时。结果表明,北京周围地区的确存在速度结构的横向差异,第一层底深度自西北向东南逐块增加。得到的新震中位置一般比原台网测定位置更靠近表面断层线。
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| 关 键 词： | 地震参数 联合测定 P波速度结构 北京地区 速度模型 震相 校正量 横向差异 台站校正值 时数 |
| 收稿时间： | 1981-08-24 |
THE JOINT DETERMINATION OF HYPOCENTER PARAMETERS AND VELOCITY STRUCTURE IN THE BEIJING AREA OF CHINA |
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| ZHAO ZHONG-HE.THE JOINT DETERMINATION OF HYPOCENTER PARAMETERS AND VELOCITY STRUCTURE IN THE BEIJING AREA OF CHINA[J].Chinese Journal of Geophysics,1983,26(2):131-139. |
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| Authors: | ZHAO ZHONG-HE |
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| Institution: | Institute of Geophysics State Seismologieal Bureau |
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| Abstract: | A new seismic velocity model was constructed for improving routine determination of hypocenter parameters in the Beijing Telemetered Seismological Network （BTSN）. This model describes a region of approximately 350 km X 450 km and consists of 4 layers over a half space, with the first layer divided into 3 blocks to include lateral variation of the shallow structure and topographic relief effects. The adjustable parameters for the velocity model in the joint determination include the average P-wave velocities in each layer, the block thicknesses, the layer depths, and the average ratio of P- and S-wave velocities. By separating the velocity model parameters from the hypocenter parameters, the solution of a large set of equations for simultaneous determination of these parameters is avoided.836 P- and S-arrival times from 43 events recorded by the BTSN in 1979 are used for the joint determination. The result indicates that in the area around Beijing there is a lateral inhomogeneity of velocity structure; the bottom depth of the blocks in the first layer increases by 3.5 km from NW to SB. The newly determined hypocenters are generally located closer to mapped surface fault traces than hypocenters for the same events previously determined by the BTSN. |
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