汶川8.0级地震地震动峰值加速度衰减特性分析
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摘要
利用汶川8.0级特大地震中107个台站所获取的强震动加速度记录进行回归统计分析,给出了此次地震的地震动峰值加速度衰减关系.将107个台站分为上盘区和下盘区两部分,其中77个台站属于上盘区,30个台站属于下盘区.对上/下盘区进行了详细的地震动衰减特性对比分析,主要包括两个区的水平向和竖向峰值加速度衰减关系、竖向与水平向峰值加速度比值变化以及是否存在上/下盘效应等,揭示了汶川地震近断层地震动一些特性.
The strong motion recordings at 107 observation stations from Wenchuan 8.0 earthquake in 2008 are analyzed with the statistics method.For comparising the ground motions in two different regions—the hanging wall and footwall regions,the 107 observation stations are divided into the two regions.There are 77 stations in the hanging wall region and others in the footwall region.The acceleration attenuation relationships of strong motions were analyzed by the least squares method.Two horizontal and Two vertical acceleration attenuation relationships are obtained.Based on these relationships,the characteristics of strong motions,including the horizontal and vertical acceleration attenuations,the variation of ratio of peak accelerations in horizontal and vertical motions,and the hanging wall and footwall effects are discussed to find out the difference of strong motions in the two regions.Finally,attenuation models are compared with some well-known attenuation relationships.
The strong motion recordings at 107 observation stations from Wenchuan 8.0 earthquake in 2008 are analyzed with the statistics method.For comparising the ground motions in two different regions—the hanging wall and footwall regions,the 107 observation stations are divided into the two regions.There are 77 stations in the hanging wall region and others in the footwall region.The acceleration attenuation relationships of strong motions were analyzed by the least squares method.Two horizontal and Two vertical acceleration attenuation relationships are obtained.Based on these relationships,the characteristics of strong motions,including the horizontal and vertical acceleration attenuations,the variation of ratio of peak accelerations in horizontal and vertical motions,and the hanging wall and footwall effects are discussed to find out the difference of strong motions in the two regions.Finally,attenuation models are compared with some well-known attenuation relationships.
引文
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[14]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震动与工程振动,2003,23(3):25-29.ZHOU Zhen-hua,ZHOU Yong-nang,LU Tao,et al.Study on characteristics of vertical ground motion[J].Journal of Earthquake Engineering and EngineeringVibration,2003,23(3):25-29.(in Chinese)
[15]中国建筑科学研究院GB50011—2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[2]JOYNER W B,BOORE D M.Peak horizontal accelerationand velocity from strong motion records including recordsfrom the 1979 imperial valley,California,earthquake[J].Bulletin of the Seismological Society of America,1981,71(6):2011-2038.
[3]FUKUSHIMA Y,TANNAKA T.A new attenuationrelation for peak horizontal acceleration of strongearthquake ground motion in Japan[J].Bulletin of theSeismological Society of America,1990,80(4):757-783.
[4]霍俊荣.近场强地面运动衰减规律的研究[D].哈尔滨:国家地震局工程力学研究所,1989.HOU J R.Study on the attenuation law of near field groundmotion[D].Haerbin:the Institute of EngineeringMechanics,State Seismological Bureau,1989.(inChinese)
[5]胡聿贤.地震安全性评价技术教程[M].北京:地震出版社,1999:282-320.
[6]BOORE D M,JOYNER W B,FUMAL T E.Equations forestimating horizontal response spectra and peakacceleration from Western North American earthquake:asummary of recent work[J].Seismological ResearchLetters,1997,68(1):128-153.
[7]FUKUSHIMA Y,IRIKURA K,UETAKE T,et al.Characteristics of observed peak amplitude for strongground motion from the 1995 hyogoken nanbu(Kobe)earthquake.Bulletin of the Seismological Society ofAmerica,1990(3):545-565.
[8]KANNO T,NARITA A,MORIKAWA N,et al.A newattenuation relation for strong ground motion in Japan basedon recorded data[J].Bulletin of the Seismological Societyof America,2006,96(6):879-897.
[9]李小军,阎秀杰,潘华.中小震近场地震动估计中地震动衰减关系的适用性分析[J].地震工程与工程振动,2005,25(1):1-7.LI Xiao-jun,YAN Xiu-jie,PAN Hua.Suitability analysisof ground motion attenuation relation in estimation of near-field ground motion for small and moderate earthquakes[J].Earthquake Engineering and Engineering Vibration,2005,25(1):1-7.(in Chinese)
[10]李小军,周正华,于海英,等.汶川8.0级地震强震动观测及记录初步分析[C]∥汶川地震建筑震害调查与灾后重建分析报告,北京:中国建筑工业出版社,2008:3-12.LI Xiao-jun,ZHOU Zheng-hua,YU Hai-ying,et al.Preliminary analysis of recordings and observation ofstrong motion from the Magnitude 8.0 WenchuanEarthquake[C]∥Analysis Report on the Survey ofBuilding Damages and Post-disaster Reconstruction in theWenchuan Earthquake,Beijing:China Architecture&Building Press,2008:3-12.(in Chinese)
[11]LI X J,ZHOU Z H,YU H Y,et al.Strong motionobservations and recordings from the great Wenchuanearthquake[J].Earthquake Engineering and EngineeringVibration,2008,7(3):235-246.
[12]LI X J,ZHOU Z H,HUANG M,et al.Preliminaryanalysis of strong-motion recordings from the magnitude8.0 Wenchuan,China earthquake of May 12,2008[J].Seismological Research Letters,2008,79(6):844-854.
[13]卢寿德,李小军.汶川8.0级地震未校正加速度记录[M].北京:地震出版社,2008:50-60.
[14]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震动与工程振动,2003,23(3):25-29.ZHOU Zhen-hua,ZHOU Yong-nang,LU Tao,et al.Study on characteristics of vertical ground motion[J].Journal of Earthquake Engineering and EngineeringVibration,2003,23(3):25-29.(in Chinese)
[15]中国建筑科学研究院GB50011—2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
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