2007年宁洱M_S6.4地震的地面运动预测
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摘要
根据普洱、西双版纳地区6个地震观测台站在2008—2009年获取的5级以上的地震资料,利用接收函数和面波衰减系数,反演得到了研究区域的S波速度结构和Qβ结构.基于该结构模型,采用随机振动理论方法,预测了2007年宁洱MS6.4地震发生后,在震中距为10—300km范围内引起的地面运动,并借助获取的强震观测记录检验、评价了该预测结果.同时,将地面运动预测结果与利用回归衰减公式计算得到的结果进行对比,进而讨论该地震动预测方法在地面运动预测中的可行性.结果表明,该预测结果与实测结果吻合.
Seismic records of M>5.0 earthquakes during 2008 to 2009 were acquired at 6 seismic stations in Pu'er and Xishuangbanna regon.We obtained S-wave velocity structure beneath these stations by receiver function analysis and Qβ model from attenuation coefficients of surface waves.Based on the resulted velocity model,we evaluated the relationship between peak accelerations and epicentral distances,ranging from 10 to 300 km,for the 2007 Ning'er earthquake with random vibration theory method.Through comparing the predicted peak ground motion with that calculated from regression attenuation formula,the feasibility of the used prediction method is discussed.The comparison shows that the two results are consistent,indicting the predicted ground motion being reasonable.
Seismic records of M>5.0 earthquakes during 2008 to 2009 were acquired at 6 seismic stations in Pu'er and Xishuangbanna regon.We obtained S-wave velocity structure beneath these stations by receiver function analysis and Qβ model from attenuation coefficients of surface waves.Based on the resulted velocity model,we evaluated the relationship between peak accelerations and epicentral distances,ranging from 10 to 300 km,for the 2007 Ning'er earthquake with random vibration theory method.Through comparing the predicted peak ground motion with that calculated from regression attenuation formula,the feasibility of the used prediction method is discussed.The comparison shows that the two results are consistent,indicting the predicted ground motion being reasonable.
引文
[1]http:∥earthquake.usgs.gov/earthquakes/eqarchives/sopar/USGS National Earthquake Information Center,Source Parameter Search Results.
[2]http:∥www.globalcmt.org/CMTsearch.html Erik Larson,G.Ekstr and M.Nettles,Global CMT Catalogsearch results.
陈培善,李保昆,白彤霞.1999.中国强地震动速度衰减研究[J].地球物理学报,42(3):358--370.
陈慧,叶建庆,刘学军,蔡绍平,崔庆谷,杨周胜,何家斌,李勇,高洋.2007.2007年云南宁洱6.4级地震监测与研究[J].地震研究,30(4):344--349.
崔建文,李世成,高东,赵永庆,包一峰.2006.云南分区地震动衰减关系[J].地震研究,29(4):386--391.
胡聿贤.1982.基岩地震动参数与震级和距离的关系[J].地震学报,4(2):199--207.
胡家富,朱雄关,夏静瑜,陈赟.2005.利用面波和接收函数联合反演滇西地区壳幔速度结构[J].地球物理学报,48(5):1069--1076.
李永华,吴庆举,田小波,张瑞青,潘佳铁,曾融生.2009.用接收函数方法研究云南及其邻区地壳上地幔结构[J].地球物理学报,52(1):67--80.
王碧泉,吴大铭,边银菊.1999.中国华北峰值加速度的衰减特性及与北美东部的比较[J].地震学报,21(1):24--31.
王培德,陈运泰,王鸣.1993.中国西南地区近震源强地面运动特征[M].北京:地震出版社:22--25.
吴庆举,田小波,张乃铃,李卫平,曾融生.2003.用Wiener滤波方法提取台站接收函数[J].中国地震,19(1):41--47.
姚虹,冯锐.1988.中国东西剖面的地壳Q结构研究[J].地震研究,21(6):539--550.
张勇,许力生,陈运泰,冯万鹏,杜海林.2008.2007年云南宁洱MS6.4地震震源破裂过程[J].中国科学:D辑,38(6):683--692.
Aki K.1967.Scaling law of seismic spectrum[J].J Geophys Res,72(4):1217--1231.
Boore D M.1983.Stochastic simulation of high-frequency ground motions based on seismological models of the radiatedspectra[J].Bull Seism Soc Amer,73(6):1865--1894.
Bouchon M.1982.The complete synthesis of seismic crustal phases at regional distances[J].J Geophys Res,87(B3):1735--1741.
Brune J N.1970.Tectonic stress and the spectra of seismic shear waves from earthquakes[J].J Geophys Res,75(26):4997--5009.
Burgr R W,Somerville P G,Barker J S,Herrmann R B,Helmberger D V.1987.The effect of crustal structure onstrong ground motion attenuation relations in eastern North America[J].Bull Seism Soc Amer,77(2):420--439.
Ou G B,Herrmann R B.1990.A statistical model for ground motion produced by earthquake at local and regional distances[J].Bull seism Soc Amer,80(6):1397--1417.
Hanks T C.1979.b values andω-γseismic source models:Implications for tectonic stress variations along active crustalfault zones and the estimation of high-frequency strong ground motion[J].J Geophys Res,84(B5):2235--2242.
Hanks T C,McGuire R K.1981.The character of high-frequency strong ground motion[J].Bull Seism Soc Amer,71(6):2071--2095.
Herrmann R B.1985.An extension of random vibration theory estimates of strong ground motion to large distances[J].Bull Seism Soc Amer,75(6):1447--1453.
Kennett B L N.1986.Lg waves and structural boundaries[J].Bull Seism Soc Amer,76(4):1133--1141.
McGuire R K,Hanks T C.1980.RMS accelerations and spectral amplitudes of strong ground motion during the San Fernando,California,earthquake[J].Bull Seism Soc Amer,70(5):1907--1919.
Singh S,Herrmann R B.1983.Regionalization of crustal coda Qin the continental United States[J].J Geophys Res,88(B1):527--538.
[2]http:∥www.globalcmt.org/CMTsearch.html Erik Larson,G.Ekstr and M.Nettles,Global CMT Catalogsearch results.
陈培善,李保昆,白彤霞.1999.中国强地震动速度衰减研究[J].地球物理学报,42(3):358--370.
陈慧,叶建庆,刘学军,蔡绍平,崔庆谷,杨周胜,何家斌,李勇,高洋.2007.2007年云南宁洱6.4级地震监测与研究[J].地震研究,30(4):344--349.
崔建文,李世成,高东,赵永庆,包一峰.2006.云南分区地震动衰减关系[J].地震研究,29(4):386--391.
胡聿贤.1982.基岩地震动参数与震级和距离的关系[J].地震学报,4(2):199--207.
胡家富,朱雄关,夏静瑜,陈赟.2005.利用面波和接收函数联合反演滇西地区壳幔速度结构[J].地球物理学报,48(5):1069--1076.
李永华,吴庆举,田小波,张瑞青,潘佳铁,曾融生.2009.用接收函数方法研究云南及其邻区地壳上地幔结构[J].地球物理学报,52(1):67--80.
王碧泉,吴大铭,边银菊.1999.中国华北峰值加速度的衰减特性及与北美东部的比较[J].地震学报,21(1):24--31.
王培德,陈运泰,王鸣.1993.中国西南地区近震源强地面运动特征[M].北京:地震出版社:22--25.
吴庆举,田小波,张乃铃,李卫平,曾融生.2003.用Wiener滤波方法提取台站接收函数[J].中国地震,19(1):41--47.
姚虹,冯锐.1988.中国东西剖面的地壳Q结构研究[J].地震研究,21(6):539--550.
张勇,许力生,陈运泰,冯万鹏,杜海林.2008.2007年云南宁洱MS6.4地震震源破裂过程[J].中国科学:D辑,38(6):683--692.
Aki K.1967.Scaling law of seismic spectrum[J].J Geophys Res,72(4):1217--1231.
Boore D M.1983.Stochastic simulation of high-frequency ground motions based on seismological models of the radiatedspectra[J].Bull Seism Soc Amer,73(6):1865--1894.
Bouchon M.1982.The complete synthesis of seismic crustal phases at regional distances[J].J Geophys Res,87(B3):1735--1741.
Brune J N.1970.Tectonic stress and the spectra of seismic shear waves from earthquakes[J].J Geophys Res,75(26):4997--5009.
Burgr R W,Somerville P G,Barker J S,Herrmann R B,Helmberger D V.1987.The effect of crustal structure onstrong ground motion attenuation relations in eastern North America[J].Bull Seism Soc Amer,77(2):420--439.
Ou G B,Herrmann R B.1990.A statistical model for ground motion produced by earthquake at local and regional distances[J].Bull seism Soc Amer,80(6):1397--1417.
Hanks T C.1979.b values andω-γseismic source models:Implications for tectonic stress variations along active crustalfault zones and the estimation of high-frequency strong ground motion[J].J Geophys Res,84(B5):2235--2242.
Hanks T C,McGuire R K.1981.The character of high-frequency strong ground motion[J].Bull Seism Soc Amer,71(6):2071--2095.
Herrmann R B.1985.An extension of random vibration theory estimates of strong ground motion to large distances[J].Bull Seism Soc Amer,75(6):1447--1453.
Kennett B L N.1986.Lg waves and structural boundaries[J].Bull Seism Soc Amer,76(4):1133--1141.
McGuire R K,Hanks T C.1980.RMS accelerations and spectral amplitudes of strong ground motion during the San Fernando,California,earthquake[J].Bull Seism Soc Amer,70(5):1907--1919.
Singh S,Herrmann R B.1983.Regionalization of crustal coda Qin the continental United States[J].J Geophys Res,88(B1):527--538.
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