基于地震监测台网资料近实时插值计算震动图的初步研究
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摘要
本文首先介绍了国内外有关震动图研究方面的动态。针对国内大部分地区的地震监测台网密度还比较低的现状,在已知震源位置和发震时刻的前提下,作者提出了利用实际地震台网观测资料近实时插值计算网格点处地震图的方法,在插值计算时充分考虑地震波在时间上的传播特征及在空间上的衰减规律。随后,对该方法的适用性进行了验证。以0.05°(约5Km)为尺度先对整个福建地区进行网格化划分,并以顺昌ML4.9级地震为例采用以上方法计算得到所有网格点处的地震时程。随后以1s为间隔,分别得到该时间间隔内的最大值等值线图,最后将所有的等值线图连续播放,得到了一种新形式的"ShakeMap"。作者还给出了顺昌地震最终的峰值地震动(PGV、PGA)分布,并分别对实际记录最大值及插值记录最大值随震中距的衰减关系进行了对比分析,结果充分证实了本文结果的可靠性。
In this paper,we introduce the research trends that related to ShakeMap.Because of the low density of the seismic monitoring stations in most area of our country,we propose a near real-time interpolation method based on few station’s information if we already knew the epicenter and origin time of an earthquake.During the interpolation,we fully considered the wave propagation rule and amplitude attenuation law.Then,we test the suitability of this method by take the Shunchang ML 4.9 earthquake as an example.We grid the Fujian region with 0.05 degree,then calculate the time history in each grid node use our method.Every 1 second,we can get a contour picture of the peak value,then play all these pictures together and generate a new form of ShakeMap.The author also shows the final distribution of PGV and PGA,and compares the attenuation relation of peak values between interpolation results and station’s record.In summary,these results confirm our method and show a reliable performance.
In this paper,we introduce the research trends that related to ShakeMap.Because of the low density of the seismic monitoring stations in most area of our country,we propose a near real-time interpolation method based on few station’s information if we already knew the epicenter and origin time of an earthquake.During the interpolation,we fully considered the wave propagation rule and amplitude attenuation law.Then,we test the suitability of this method by take the Shunchang ML 4.9 earthquake as an example.We grid the Fujian region with 0.05 degree,then calculate the time history in each grid node use our method.Every 1 second,we can get a contour picture of the peak value,then play all these pictures together and generate a new form of ShakeMap.The author also shows the final distribution of PGV and PGA,and compares the attenuation relation of peak values between interpolation results and station’s record.In summary,these results confirm our method and show a reliable performance.
引文
[1]David J.Wald,Paul S.Earle,Kuo-Wan Lin et al.Challengesin rapid ground motion estimation for the prompt assessment ofglobal urban earthquakes[J].Bull.Earthq.Res.Inst.Univ.Tokyo,2006,81(273-281).
[2]David J.Wald,V.Quitoriano,T.H Heaton,H.Kanamori and C.W.Scrivner,Trinet“hakeMaps”:Rapid Generation of PeakGround Motion and Intensity Maps for Earthquakes in SouthernCalifornia[J].Earthquake Spectra,1999,15(537-556).
[3]Yih-Min Wu and Hiroo Kanamori.Rapid assessment ofdamage potential of earthquakes in Taiwan form the beginning of Pwaves[J].Bull Seism Soc Am,2005,95(3):1181-1185.
[4]F.Yamazaki,S.Noda and K.Meguro,Developments of Monitor-ing and Early Damage Assessment System in Japan[J].Bull.ERS,No.30,1997.
[5]Douglas Dreger and Anastasia Kaverina.Development ofprocedures for the rapid estimation of ground shaking[R].1999,Seismological Laboratory of UC Berkeley.
[6]John Boatwright,Howard Bundock,Jim Luetgert,Linda Seeki-ngs et al.The dependence of PGA and PGV on distance andmagnitude inferred form northern California shakemap data[J].Bull.Seism.Soc.Am.2003,93(5):2043-2055.
[7]胡聿贤.地震工程学[M].北京:地震出版社,2006.
[8]廖振鹏.工程波动理论导论(第二版)[M].北京:科学出版社,2002.
[9]金星,廖振鹏.地震动随机场的物理模拟[J].地震工程与工程振动.1994,14(3):11-19.
[10]金星,马强,李山有.四种计算地震反应数值方法的比较研究[J].地震工程与工程振动.2003,23(1):18-30.
[11]马强,金星,李山有.单自由度系统地震动力反应的实时计算方法[J].地震工程与工程振动.2003,23(5):61-68.
[12]泽仁志玛,陈会忠,何加勇等.震动图快速生成系统研究[J].地球物理学进展.2006,21(3):809-813
[13]金星,欧益萍,康兰池.福建地区中小地震地震动峰值衰减规律研究[J].中国地震.2008,30(3):279-291.
[2]David J.Wald,V.Quitoriano,T.H Heaton,H.Kanamori and C.W.Scrivner,Trinet“hakeMaps”:Rapid Generation of PeakGround Motion and Intensity Maps for Earthquakes in SouthernCalifornia[J].Earthquake Spectra,1999,15(537-556).
[3]Yih-Min Wu and Hiroo Kanamori.Rapid assessment ofdamage potential of earthquakes in Taiwan form the beginning of Pwaves[J].Bull Seism Soc Am,2005,95(3):1181-1185.
[4]F.Yamazaki,S.Noda and K.Meguro,Developments of Monitor-ing and Early Damage Assessment System in Japan[J].Bull.ERS,No.30,1997.
[5]Douglas Dreger and Anastasia Kaverina.Development ofprocedures for the rapid estimation of ground shaking[R].1999,Seismological Laboratory of UC Berkeley.
[6]John Boatwright,Howard Bundock,Jim Luetgert,Linda Seeki-ngs et al.The dependence of PGA and PGV on distance andmagnitude inferred form northern California shakemap data[J].Bull.Seism.Soc.Am.2003,93(5):2043-2055.
[7]胡聿贤.地震工程学[M].北京:地震出版社,2006.
[8]廖振鹏.工程波动理论导论(第二版)[M].北京:科学出版社,2002.
[9]金星,廖振鹏.地震动随机场的物理模拟[J].地震工程与工程振动.1994,14(3):11-19.
[10]金星,马强,李山有.四种计算地震反应数值方法的比较研究[J].地震工程与工程振动.2003,23(1):18-30.
[11]马强,金星,李山有.单自由度系统地震动力反应的实时计算方法[J].地震工程与工程振动.2003,23(5):61-68.
[12]泽仁志玛,陈会忠,何加勇等.震动图快速生成系统研究[J].地球物理学进展.2006,21(3):809-813
[13]金星,欧益萍,康兰池.福建地区中小地震地震动峰值衰减规律研究[J].中国地震.2008,30(3):279-291.
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