基于2014年云南景谷M_W 6.0地震的中强震地震动的方向性特征分析
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摘要
一般认为大地震震源破裂传播过程会造成近断层地震动的方向性特征,为了验证中强地震是否存在方向性特征,本研究以2014年10月7日云南省景谷县M_W6. 0级中强地震的强震记录为基础,选取获得的39组主震记录,按照台站相对于断层的位置及走向将其划分为西北向和东南向两类场点.分别对垂直于断层和平行于断层的地震动分量的峰值、反应谱和持时参数进行了定量对比和分析.研究结果表明:(1)在峰值方面,西北向场点的峰值明显大于东南向的峰值,而且西北和东南向的峰值差别随着断层距的增大而逐渐减小;(2)在反应谱方面,西北向的平均反应谱明显高于东南向平均反应谱,并且当周期在1. 2～4. 0 s之间时,西北向和东南向反应谱谱比最高可达到7倍以上;(3)在持时方面,在断层距小于80 km的区域内,东南向的持时要明显大于西北向的持时.研究结果表明景谷地震的地震动表现出了较为明显的方向性特征.本研究分析结果可以为研究中强地震的地震动工程参数的方向性特征提供参考.
It is thought that direction of the great earthquake rupture propagation will lead to near-fault ground motion directional characteristics. In order to verify whether there is directional characteristics of moderate strong earthquakes, we study the directivity characteristics of the acceleration ground motion during the M_W6. 0 Yunnan Jinggu earthquake. Totally 39 sets of ground motions recorded are analyzed in this study. Firstly,the recordings are classified into two groups according to the relative location to the epicenter and the rupture direction. Then,the amplitude,response spectra and duration are analyzed. Results indicate that:( 1) In terms of peak,the peak of the northwest is significantly higher than the southeast and the peak value decreases with the increase of fault distance;( 2) In terms of response spectra,the average response spectrum of northwest is obviously higher than southeast and when the period between 1. 2 ～ 4. 0 s,and the response spectrum ratio of the northwest and the southeast can reach more than 7 times;( 3) In terms of duration,in the near field area with the fault distance less than 80 km,the duration of the southeast is obviously larger than the northwest. The results show that the Jinggu moderate magnitude earthquake shows more obvious directional characteristics. The results of this study can provide a reference for studying the directional characteristics of seismic engineering parameters of moderate magnitude earthquakes.
It is thought that direction of the great earthquake rupture propagation will lead to near-fault ground motion directional characteristics. In order to verify whether there is directional characteristics of moderate strong earthquakes, we study the directivity characteristics of the acceleration ground motion during the M_W6. 0 Yunnan Jinggu earthquake. Totally 39 sets of ground motions recorded are analyzed in this study. Firstly,the recordings are classified into two groups according to the relative location to the epicenter and the rupture direction. Then,the amplitude,response spectra and duration are analyzed. Results indicate that:( 1) In terms of peak,the peak of the northwest is significantly higher than the southeast and the peak value decreases with the increase of fault distance;( 2) In terms of response spectra,the average response spectrum of northwest is obviously higher than southeast and when the period between 1. 2 ～ 4. 0 s,and the response spectrum ratio of the northwest and the southeast can reach more than 7 times;( 3) In terms of duration,in the near field area with the fault distance less than 80 km,the duration of the southeast is obviously larger than the northwest. The results show that the Jinggu moderate magnitude earthquake shows more obvious directional characteristics. The results of this study can provide a reference for studying the directional characteristics of seismic engineering parameters of moderate magnitude earthquakes.
引文
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REN Y F,WEN R Z,ZHOU B F,et al.2014.The characteristics of strong ground motion of Lushan Earthquake on April 20,2013[J].Chinese Journal of Geophysics(in Chinese),57(6):1836-1846.
Seekins L C,Boatwright J.2010.Rupture directivity of moderate earthquake in northern California[J].Bulletin of the Seismological Society of America,100(3):1107-1119.
TAO N F,ZHANG Z Y.1994.Microzonation of ground motion during based on probabilistic method.Journal of Tongji University(in Chinese),22(2):230-235.
The office of China Earthquake Administration.2014.China Earthquake Administration publish Yunnan Jinggu MS6.6 earthquake intensity map[OL].[2014-10-11].http://www.cea.gov.cn/publish/dizhenj/464/478/20141 011091458652940205/index.html.
Vanmarcke E H,Lai S S P.1980.Strong motion duration and RMSamplitude of earthquake records[J].Bulletin of the Seismological Society of America,70(2):1293-1370.
WANG D,XIE L L.2007.The influence of the fault dipangle on the hanging wall/footwall effect[J].Journal of Earthquake Engineering and Engineering Vibratrion(in Chinese),27(5):1-6.
WANG H W,WEN R Z,REN Y F,et al.2016.Rapid rupture direction estimation of Kangding earthquake using strong-motion recordings[J].Journal of Southwest Jiaotong University(in Chinese),51(6):1138-1146.
戴嘉伟,冀昆,温瑞智,等.2015.云南景谷MS6.6地震地震动特征分析[J].地震工程学报,37(4):969-975.
胡进军,谢礼立.2011.汶川地震近场加速度基本参数的方向性特征[J].地球物理学报,54(10):2581-2589.
冀昆,温瑞智,崔建文,等.2014.鲁甸MS6.5级地震强震动记录及震害分析[J].震灾防御技术,9(3):325-339.
任叶飞,温瑞智,周宝峰,等.2014.2013年4月20日四川芦山地震强地面运动三要素特征分析[J].地球物理学报,57(6):1836-1846.
陶能付,章在墉.1994.以概率为基础的地震动持续时间小区划[J].同济大学学报:自然科学版,22(2):230-235.
王栋,谢礼立.2007.断层倾角对上/下盘效应的影响[J].地震工程与工程振动,27(5):1-6.
王宏伟,温瑞智,任叶飞,等.2016.基于强震记录快速确定康定地震的震源破裂方向研究[J].西南交通大学学报,51(6):1138-1146.
中国地震局办公室.2014.中国地震局发布云南景谷6.6级地震烈度图[OL].[2014-10-11].http://www.cea.gov.cn/publish/dizhenj/464/478/20141011091458652940205/index.html.
(1)张勇,许力生,陈运泰. 2014. 2014年10月7日云南省普洱市景谷傣族彝族自治县Ms6. 6地震(2. 0版)[R].中国地震局地球物理研究所.
(2)郭志. 2014. 2014年10月7日云南省普洱市景谷傣族彝族自治县Ms6. 6地震矩张量解[R].北京:中国地震局地质研究所.
Boatwright J,Boore D M.1982,Analysis of the ground accelerations radiated by the 1980 Livermore Valley earthquakes for directivity and dynamic source characteristics[J].Bulletin of the Seismologica Society of America,72(6A):1843-1865.
Convertito V,Caccavale M,Matteis R D,et al.2012.Fault extent estimation for near-real-time ground-shacking map computation purposes[J].Bulletin of the Seismological Society of America,102(2):661-679.
DAI J W,JI K,WEN R Z,et al.2015.Ground motion characteristics of the Jinggu MS6.6 earthquake in Yunnan[J].China Earthquake Engineering Journal(in Chinese),37(4):969-975.
HU J J,XIE L L.2011.Directivity in the basic parameters of the nearfield acceleration ground motion during the Wenchuan earthquake[J].Chinese Journal of Geophysics(in Chinese),54(10):2581-2589.
HU Jinjun,ZHANG Wenbo,XIE Lili,et al.2015,Strong motion characteristics of the MW6.6 Lushan earthquake,Sichuan,Chinaan insight into the spatial difference of a typical thrust fault earthquake[J].Earthquake Engineering and Engineering Vibration,14(2):203-216.
JI K,WEN R Z,CUI J W,et al.2014.Observation of strong motion and damage impications for MS6.5 Ludian earthquake[J].Technology for Earthquake Disaster Pervention(in Chinese),9(3):325-339.
REN Y F,WEN R Z,ZHOU B F,et al.2014.The characteristics of strong ground motion of Lushan Earthquake on April 20,2013[J].Chinese Journal of Geophysics(in Chinese),57(6):1836-1846.
Seekins L C,Boatwright J.2010.Rupture directivity of moderate earthquake in northern California[J].Bulletin of the Seismological Society of America,100(3):1107-1119.
TAO N F,ZHANG Z Y.1994.Microzonation of ground motion during based on probabilistic method.Journal of Tongji University(in Chinese),22(2):230-235.
The office of China Earthquake Administration.2014.China Earthquake Administration publish Yunnan Jinggu MS6.6 earthquake intensity map[OL].[2014-10-11].http://www.cea.gov.cn/publish/dizhenj/464/478/20141 011091458652940205/index.html.
Vanmarcke E H,Lai S S P.1980.Strong motion duration and RMSamplitude of earthquake records[J].Bulletin of the Seismological Society of America,70(2):1293-1370.
WANG D,XIE L L.2007.The influence of the fault dipangle on the hanging wall/footwall effect[J].Journal of Earthquake Engineering and Engineering Vibratrion(in Chinese),27(5):1-6.
WANG H W,WEN R Z,REN Y F,et al.2016.Rapid rupture direction estimation of Kangding earthquake using strong-motion recordings[J].Journal of Southwest Jiaotong University(in Chinese),51(6):1138-1146.
戴嘉伟,冀昆,温瑞智,等.2015.云南景谷MS6.6地震地震动特征分析[J].地震工程学报,37(4):969-975.
胡进军,谢礼立.2011.汶川地震近场加速度基本参数的方向性特征[J].地球物理学报,54(10):2581-2589.
冀昆,温瑞智,崔建文,等.2014.鲁甸MS6.5级地震强震动记录及震害分析[J].震灾防御技术,9(3):325-339.
任叶飞,温瑞智,周宝峰,等.2014.2013年4月20日四川芦山地震强地面运动三要素特征分析[J].地球物理学报,57(6):1836-1846.
陶能付,章在墉.1994.以概率为基础的地震动持续时间小区划[J].同济大学学报:自然科学版,22(2):230-235.
王栋,谢礼立.2007.断层倾角对上/下盘效应的影响[J].地震工程与工程振动,27(5):1-6.
王宏伟,温瑞智,任叶飞,等.2016.基于强震记录快速确定康定地震的震源破裂方向研究[J].西南交通大学学报,51(6):1138-1146.
中国地震局办公室.2014.中国地震局发布云南景谷6.6级地震烈度图[OL].[2014-10-11].http://www.cea.gov.cn/publish/dizhenj/464/478/20141011091458652940205/index.html.
(1)张勇,许力生,陈运泰. 2014. 2014年10月7日云南省普洱市景谷傣族彝族自治县Ms6. 6地震(2. 0版)[R].中国地震局地球物理研究所.
(2)郭志. 2014. 2014年10月7日云南省普洱市景谷傣族彝族自治县Ms6. 6地震矩张量解[R].北京:中国地震局地质研究所.