云南测震台网台站场地响应与M_L震级测定的讨论
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摘要
利用2016年云南测震台网记录到的地脉动数据,运用H/V谱比法计算分析了47个测震台站在0.1～20.0Hz频段内的场地响应。选取2012～2016年期间云南测震台网记录到的ML≥2.5地震做单台震级偏差统计分析,挑出受场地放大作用而出现单台震级大于台网平均震级的台站做去场地放大校正,然后重新统计单台震级偏差情况。计算结果显示云南测震台网的台站受台基条件和所处位置等地质构造因素影响,均存在一定程度的场地放大作用,大部分台站场地响应的卓越频率为1～6Hz,放大倍数为2～4倍。受场地放大作用的影响,大姚、芒市等19个台站的单台ML震级大于台网平均震级。在去除场地放大作用后,台站单台震级与台网平均震级的偏差有所减小。
Using micro tremors noise data recorded by the Yunnan Digital Seismic Network in 2016,we analyzed the site response of 47 seismic stations in 0.1 ～ 20 Hz frequency band,based on the H/V spectral ratio method. We analyzed the single magnitude deviation recorded from earthquakes of M_L≥2.5 in the Yunnan Digital Seismic Network from 2012 to 2016. The stations with single magnitude greater than the average magnitude of network are selected,and their single magnitude deviation are recalculated. The results show that all stations of the Yunnan Digital Seismic Network have a degree of site amplification because of many factors,such as the situation of site platform and geological structure. For most seismic stations,the excellent site response frequency is 1 ～ 6 Hz,and the amplification is 2 ～ 4 times. Due to the effect of the site amplification,the single MLmagnitudes of 19 stations such as Dayao and Mangshi are greater than the average magnitude of the network. The deviations between the single magnitude and the average magnitude of the network are decreased,after the removal of the site amplification.
Using micro tremors noise data recorded by the Yunnan Digital Seismic Network in 2016,we analyzed the site response of 47 seismic stations in 0.1 ～ 20 Hz frequency band,based on the H/V spectral ratio method. We analyzed the single magnitude deviation recorded from earthquakes of M_L≥2.5 in the Yunnan Digital Seismic Network from 2012 to 2016. The stations with single magnitude greater than the average magnitude of network are selected,and their single magnitude deviation are recalculated. The results show that all stations of the Yunnan Digital Seismic Network have a degree of site amplification because of many factors,such as the situation of site platform and geological structure. For most seismic stations,the excellent site response frequency is 1 ～ 6 Hz,and the amplification is 2 ～ 4 times. Due to the effect of the site amplification,the single MLmagnitudes of 19 stations such as Dayao and Mangshi are greater than the average magnitude of the network. The deviations between the single magnitude and the average magnitude of the network are decreased,after the removal of the site amplification.
引文
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华卫、陈章立、郑斯华,2010,利用不同方法估算流动台站的场地响应,地震,30(3),30-44.
李丹宁、马志斌、续外芬等,2016,云南地区非弹性衰减系数及场地响应研究,大地测量与地球动力学,36(12),1041-1046.
刘丽芳、苏有锦、刘杰等,2007,用Moya方法反演云南数字地震台站场地响应,地震研究,30(1),39-42.
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马淑芹、栗连弟、卞真付等,2007,用Nakamura技术评估天津地区场地效应,中国地震,23(1),25-34.
苏有锦、刘杰、郑斯华等,2006,云南地区S波非弹性衰减Q值研究,地震学报,28(2),206-212.
王赞赞、钱进、崔建文等,2009,利用宁洱地震强震记录分析场地响应,地震研究,32(2),151-154.
张红才、徐嘉隽、陈智勇,2015,基于噪声谱比法的福建台网观测台站的场地响应研究,地震学报,37(6),1045-1058.
朱荣欢、苏有锦,2007,用H/V谱比法计算云南区域数字地震台站的场地响应,地震研究,30(3),248-252.
Andrews D J,1986,Objective determination of source parameters and similarity of earthquakes of different size, In:Das S,Boatwright J,Scholz C H,Earthquakes Source Mechanics,29-267, Washington D.C.:AGU.
Borcherdt R D,1970, Effects of local geology on ground motion near San Francisco Bay,Bull Seismol Soc Am,60(1),29-61.
Ducellier A,Kawase H, Matsushima S,2013, Validation of a new velocity structure inversion method based on horizontal-to-vertical(H/V)spectral ratios of earthquake motions in the Tohoku area,Japan,Bull Seismol Soc Am,103(2A),958-970.
Konno K,Ohmachi T, 1998, Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor,Bull Seismol Soc Am,88(1),228-241.
Moya A, Aguirre J,Irikura K,2000, Inversion of source parameters and site effects from strong ground motion records using geneticalgorithms,Bull Seismol Soc Am,90(4),977-992.
Nakamura Y,1989,A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface, Quart Rep Railway Tech Res Inst,30(1),25-33.
Shearer P M, 1999, Introduction to Seismology, New York:Cambridge University Press.
华卫、陈章立、郑斯华,2010,利用不同方法估算流动台站的场地响应,地震,30(3),30-44.
李丹宁、马志斌、续外芬等,2016,云南地区非弹性衰减系数及场地响应研究,大地测量与地球动力学,36(12),1041-1046.
刘丽芳、苏有锦、刘杰等,2007,用Moya方法反演云南数字地震台站场地响应,地震研究,30(1),39-42.
马淑芹、龚绍京、粟连弟等,2001,使用地面单台三分向地震记录资料评估场地效应方法的研究,西北地震学报,23(3),269-273.
马淑芹、栗连弟、卞真付等,2007,用Nakamura技术评估天津地区场地效应,中国地震,23(1),25-34.
苏有锦、刘杰、郑斯华等,2006,云南地区S波非弹性衰减Q值研究,地震学报,28(2),206-212.
王赞赞、钱进、崔建文等,2009,利用宁洱地震强震记录分析场地响应,地震研究,32(2),151-154.
张红才、徐嘉隽、陈智勇,2015,基于噪声谱比法的福建台网观测台站的场地响应研究,地震学报,37(6),1045-1058.
朱荣欢、苏有锦,2007,用H/V谱比法计算云南区域数字地震台站的场地响应,地震研究,30(3),248-252.
Andrews D J,1986,Objective determination of source parameters and similarity of earthquakes of different size, In:Das S,Boatwright J,Scholz C H,Earthquakes Source Mechanics,29-267, Washington D.C.:AGU.
Borcherdt R D,1970, Effects of local geology on ground motion near San Francisco Bay,Bull Seismol Soc Am,60(1),29-61.
Ducellier A,Kawase H, Matsushima S,2013, Validation of a new velocity structure inversion method based on horizontal-to-vertical(H/V)spectral ratios of earthquake motions in the Tohoku area,Japan,Bull Seismol Soc Am,103(2A),958-970.
Konno K,Ohmachi T, 1998, Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor,Bull Seismol Soc Am,88(1),228-241.
Moya A, Aguirre J,Irikura K,2000, Inversion of source parameters and site effects from strong ground motion records using geneticalgorithms,Bull Seismol Soc Am,90(4),977-992.
Nakamura Y,1989,A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface, Quart Rep Railway Tech Res Inst,30(1),25-33.
Shearer P M, 1999, Introduction to Seismology, New York:Cambridge University Press.