| 基于井下摆天然地震数据测量首都圈近地表波速结构 |
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| 引用本文： | 刘渊源,崇加军,倪四道.基于井下摆天然地震数据测量首都圈近地表波速结构[J].地震学报,2011,33(3):342-350. |
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| 作者姓名： | 刘渊源 崇加军 倪四道 |
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| 作者单位： | ( 中国合肥 230026中国科学技术大学 ) |
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| 基金项目： | 中国科学院知识创新工程(kzcx2-yw-116-01); 地震行业基金(200808078,200708035)资助 |
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| 摘 要： | 收集了首都圈数字化地震遥测台网58个井下摆2003-2008年记录的102次M≥3.0地震的数据.通过鉴别直达波及对应地表反射波的波形,发现两者到时差与震中矩和方位角无关.基于斯涅尔定律,分析获得了这些台站上方厚约300 m浅地表土层P波和S波平均速度结构以及波速比.结果表明,首都圈区域近地表P波和S波平均速度分别约为...
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| 关 键 词： | 首都圈 井下摆 到时差 平均波速 波速比 |
Near surface wave velocity structure in Chinese capital region based on borehole seismic records |
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| Liu Yuanyuan,Chong Jiajun,Ni Sidao.Near surface wave velocity structure in Chinese capital region based on borehole seismic records[J].Acta Seismologica Sinica,2011,33(3):342-350. |
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| Authors: | Liu Yuanyuan Chong Jiajun Ni Sidao |
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| Institution: | （University of Science and Technology of China, Hefei 230026，China） |
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| Abstract: | Firstly we collected P and S waveform data from 102 earthquakes with Mge;3.0 for the period 2003 to 2008 observed at 58 borehole stations obtained from the Capital Circle Digital Seismic Telemetry Network catalog. After identifying direct wave and surface reflection wave, we found their delay time varied little despite distinct epicentral distances and azimuths. Based on Snell's law, we developed travel time lags to compute average wave velocity in about 300 meters of soil layer above each station. Our results show that near-surface P-and S-wave average velocity in Chinese capital region ranges from 1.6 to 2.0 km/s and 0.34 to 0.48 km/s respectively,vP/vS is about 4.0mdash;5.3. Furthermore, no obvious lateral variation of P-wave velocity structure or vP/vS is observed by comparing results of 11 borehole stations with the same depth of 247 m. The clear seismic phases for both P-and S-wave suggest no significant velocity discontinuity in the soil layer. The results are useful in both the simulation of strong ground motion and the calculation of detailed velocity structure in the crust or upper mantle, as well as some areas of earthquake engineering. |
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| Keywords: | Chinese capital region borehole stations travel time lags average wave velocity vP/vS |
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