芦山7.0级地震强震动记录及其震害相关性
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摘要
2013年4月20日芦山地震中的强震动记录是我国自2008年汶川地震后再一次比较全面地获得的高质量的数字强震动记录。国家数字强震动台网共获得3分量自由场记录114组,成都地震烈度速报台网获得63组。文章对强震动记录进行了常规处理,统计了强震动记录随断层距的数量分布情况,绘制了空间地震动加速度等值线图。结合芦山地震震源机制解和破裂过程研究成果,选取典型记录,分析加速度、速度时程的波形、振幅等特征,识别了此次地震滑冲现象,估算了竖向最大永久位移。通过利用观测数据与国外的地震动预测公式对比,分析了不同周期反应谱地震动幅值及加速度反应谱衰减规律,阐明了此次地震的地震动在近场高频成分较卓越的特点。震后现场考察了3个典型强震动台站附近建筑物震害,分析了地震动与工程震害的相关性,地震烈度的评定反映了地震破坏的程度。
The Lushan Earthquake occurred on April 20,2013 is another destructive event after Wenchuan Earthquake in 2008.During the main shock,114 strong motion records were accumulated by the National Strong Motion Observation Network System(NSMONS) of China and 63 records by the Local Earthquake Intensity Reporting Network of Chengdu City.The preliminary characteristics of these records were given including the station spatial locations,PGA contours and records numbers within different rupture distance.The analyzed results show the characteristics of predominant high-frequency components and short duration for this event.The fling step was identified on the basis of the velocity time histories of the hanging wall stations and then the maximum permanent displacement of this earthquake was evaluated.The observed PGAs and spectral accelerations were also compared with the ground motion prediction equation commonly used in Italy,which shows the observed PGAs and high-frequency spectral accelerations have a good agreement with the empirical predicted ones but the moderate and long-period components are remarkably lower.The post-field investigation also found that the macro intensities around 3 selected typical stations match well with their surround damage.
The Lushan Earthquake occurred on April 20,2013 is another destructive event after Wenchuan Earthquake in 2008.During the main shock,114 strong motion records were accumulated by the National Strong Motion Observation Network System(NSMONS) of China and 63 records by the Local Earthquake Intensity Reporting Network of Chengdu City.The preliminary characteristics of these records were given including the station spatial locations,PGA contours and records numbers within different rupture distance.The analyzed results show the characteristics of predominant high-frequency components and short duration for this event.The fling step was identified on the basis of the velocity time histories of the hanging wall stations and then the maximum permanent displacement of this earthquake was evaluated.The observed PGAs and spectral accelerations were also compared with the ground motion prediction equation commonly used in Italy,which shows the observed PGAs and high-frequency spectral accelerations have a good agreement with the empirical predicted ones but the moderate and long-period components are remarkably lower.The post-field investigation also found that the macro intensities around 3 selected typical stations match well with their surround damage.
引文
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[11]BINDI D,LUZI L,MASSA M,et al.Horizontal and vertical ground motion prediction equations derived from the Italian Accelerometric Archive(ITACA).Bulletin of Earthquake Engineering,2010,8(5):1209-1230.
[12]HOUSNER Geogre.Intensity of ground motion during strong earthquakes.Second technical report[R].California Institute of Technology,Pasade-na,California,August 1952.
[13]MASI Angelo,CHIAUZZI Leonardo,BRAGA Franco,et al.Peak and integral seismic parameters of L’Aquila 2009 ground motions:observedversus code provision values[J].Bulletin of Earthquake Engineering,2011,9(1):139-156.
[14]DB/T17-2006地震台站建设规范强震动台站[S].2006.DB/T 17-2006 Specification for the Construction of Seismic Station Strong Motion Station[S].2006.(in Chinese)
[15]温瑞智,任叶飞,齐文浩,等.2013年4月20日芦山地震最大加速度记录分析[OL].西南交通大学学报,2013,(05).http://www.cnki.net/kcms/detail/51.1277.U.20130711.11 41.001.htmlWEN Ruizhi,REN Yefei,QI Wenhao,et al.The maximum acceleration recording from Lushan Earthquake on April 20,2013[J].Journal ofSouthwest Jiaotong University 2013,(05).(in Chinese)
[2]曾祥方,罗艳,韩立波,等.2013年4月20日四川芦山Ms7.0地震:一个高角度逆冲地震[J].地球物理学报,2013,56(4):1418-1424ZENG Xiangfang,LUO Yan,HAN Libo,et al.The Lushan Ms7.0 earthquake on 20Apr 2013:A high angle thrust event[J].Chinese Journal ofGeophysics,2013,56(4):1418-1424.(in Chinese)
[3]王卫民,郝金来,姚振兴.2013年4月20日四川芦山地震震源破裂过程反演初步结果[J].地球物理学报,2013,56(4):1412-1417.WANG Weimin,HAO Jinlai,YAO Zhenxing.Preliminary result for rupture process of Apr.20,2013,Lushan Earthquake,Sichuan,China[J].Chinese Journal Geophysics,2013,56(4):1412-1417.(in Chinese)
[4]张勇,许力生,陈运泰.芦山4.20地震破裂过程及其致灾特征初步分析[J].地球物理学报,2013,56(4):1408-1411.ZHANG Yong,XU Lisheng,CHEN Yuntai.Rupture process of the Lushan 4.20 earthquake and preliminary analysis on the disaster causing mech-anism[J].Chinese Journal of Geophysics,2013,56(4):1408-1411.(in Chinese)
[5]刘杰,易桂喜,张致伟,等.2013年4月20日四川芦山Ms7.0级地震介绍[J].地球物理学报,2013,56(4):1404-1407.LIU Jie,YI Guixi,ZHANG Zhiwei,et al.Introduction the Lushan,Sichuan Ms7.0Earthquake on 20April 2013[J].2013,56(4):1404-1407.(in Chinese)
[6]BOORE David.Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi,Taiwan[J].Bul-letin of the Seismological Society of America,2001,91(5):1199-1211.
[7]STRASSER F O and BOMMER J J.Review:Strong Ground Motions—Have We Seen the Worst[J].Bulletin of the Seismological Society of Amer-ica,2009,99(5):2613-2637.
[8]GB/T17742中国地震烈度表[S].2008.GB/T 17742 The Chinese Seismic Intensity Scale[S].2008.(in Chinese)
[9]谢礼立,王海云.近场地震学中3个术语译名的商榷[J].地震工程与工程振动,2005,25(6):198-200.XIE Lili,WANG Haiyun.A proposal of Chinese translation of three technical terms in near field seismology[J].Journal of Earthquake Engineeringand Engineering Vibration,2005,25(6):198-200.(in Chinese)
[10]KALKAN Erol,KUNNATH Sashi.Effects of fling step and forward directivity on seismic response of buildings[J].Earthquake Spectra,2006,22(2):367-390.
[11]BINDI D,LUZI L,MASSA M,et al.Horizontal and vertical ground motion prediction equations derived from the Italian Accelerometric Archive(ITACA).Bulletin of Earthquake Engineering,2010,8(5):1209-1230.
[12]HOUSNER Geogre.Intensity of ground motion during strong earthquakes.Second technical report[R].California Institute of Technology,Pasade-na,California,August 1952.
[13]MASI Angelo,CHIAUZZI Leonardo,BRAGA Franco,et al.Peak and integral seismic parameters of L’Aquila 2009 ground motions:observedversus code provision values[J].Bulletin of Earthquake Engineering,2011,9(1):139-156.
[14]DB/T17-2006地震台站建设规范强震动台站[S].2006.DB/T 17-2006 Specification for the Construction of Seismic Station Strong Motion Station[S].2006.(in Chinese)
[15]温瑞智,任叶飞,齐文浩,等.2013年4月20日芦山地震最大加速度记录分析[OL].西南交通大学学报,2013,(05).http://www.cnki.net/kcms/detail/51.1277.U.20130711.11 41.001.htmlWEN Ruizhi,REN Yefei,QI Wenhao,et al.The maximum acceleration recording from Lushan Earthquake on April 20,2013[J].Journal ofSouthwest Jiaotong University 2013,(05).(in Chinese)
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