2017年九寨沟7.0级地震强震动记录处理与分析
|
摘要
对2017年8月8日四川九寨沟地震中国数字强震强震动观测台网获取的82组强震动记录进行了处理和初步分析,在分析前对记录进行了格式转换,零线校正,录入元数据生成标准格式的加速度数据。统计分析显示10 Gal以上加速度记录有46条,峰值加速度范围为0. 33～185. 02 cm/s2,峰值速度范围为0. 04～6. 55 cm/s,记录到最大仪器地震烈度为6. 2度。将实际观测数据与中国地震动参数区划图分区地震动衰减关系对比,结果显示在震中距200 km以内与Yu 2013短轴衰减关系吻合较好,但在300 km外衰减缓慢,分析了其可能的原因。同时分析了幅值较大2个台站的反应谱谱特征,九寨百河台南北向加速度反应谱高于我国7度罕遇地震的抗震设计反应谱,加速度反应谱主要周期集中在0. 1到0. 4 s以内,不会对长周期建筑造成严重破坏。最后计算了5%～75%和5%～95%两种能量持时,结果整体上符合随震中距增大而增大的规律。
The strong moiton data from Jiuzhaigou earthquake of Auguest,8,2017 were collected and processed.In order to get the standard format acceleration,the data format of the original data were transformed,the baseline were corrected,the metadata were complemented before the normal analysis and processing. There are 46 pieces of acceration larger than 10 Gal,The PGA varies from 0. 33 to 185. 02 cm/s2 and the PGV varies from 0. 04 to6. 55 cm/s. The maximum instrumental seismic intensity is 6. 2 in China seismic intensity scale. we compared the observed PGA and PGV with the Chinese attenuation relationships used in the seiscmic grond motion parameter zone map. It shows that the observed PGA and PGV within the 200 km consistent well with the Yu 2013 short axis PGA and PGV prediction attenuation relationship,but it decay slower than the relationship with epicenter distance larger than 300 km,the possible reason was proposed. The two largest response accerlation were analyzied,the reponse spectrum of NS component of 51 JZB is larger than seismic design response spectrum of 7 degreee rare earthquakes in China,The peak period of accerleration response spectrum mainly between 0. 1 second and 0. 4 second at 51 JZBand 51 JZW,it will not cause sever damage to the long period bulidings. The 5% ～ 75% siginificant duration and5% ～ 95% significant duration were calculated,the significant duration grow with the epicenter distance in the whole.
The strong moiton data from Jiuzhaigou earthquake of Auguest,8,2017 were collected and processed.In order to get the standard format acceleration,the data format of the original data were transformed,the baseline were corrected,the metadata were complemented before the normal analysis and processing. There are 46 pieces of acceration larger than 10 Gal,The PGA varies from 0. 33 to 185. 02 cm/s2 and the PGV varies from 0. 04 to6. 55 cm/s. The maximum instrumental seismic intensity is 6. 2 in China seismic intensity scale. we compared the observed PGA and PGV with the Chinese attenuation relationships used in the seiscmic grond motion parameter zone map. It shows that the observed PGA and PGV within the 200 km consistent well with the Yu 2013 short axis PGA and PGV prediction attenuation relationship,but it decay slower than the relationship with epicenter distance larger than 300 km,the possible reason was proposed. The two largest response accerlation were analyzied,the reponse spectrum of NS component of 51 JZB is larger than seismic design response spectrum of 7 degreee rare earthquakes in China,The peak period of accerleration response spectrum mainly between 0. 1 second and 0. 4 second at 51 JZBand 51 JZW,it will not cause sever damage to the long period bulidings. The 5% ～ 75% siginificant duration and5% ～ 95% significant duration were calculated,the significant duration grow with the epicenter distance in the whole.
引文
[1]于海英,江汶乡,解全才,等.近场数字强震仪记录误差分析与基线校正方法[J].地震工程与工程振动. 2009,29(6):1-12.YU Haiying,JIANG Wenxiang,XIE Quancai,et al. The error analysis and baseline correction method of near-field digital record[J]. Earthquake Engineeing and Engineering Dynamics. 2009,29(6):1-12.(in Chinese)
[2]中国地震局监测预报司.仪器地震烈度计算暂行规程[S].北京:地震出版社,2015.Department of Earthquake Monitoring and Prediction,China Earthquake Administration. Temp Specification of Instrumental Seismic Ientensity Calculation[S]. Beijing:Seismological Press,2015.(in Chinese)
[3]俞言祥,李山有,肖亮.为新区划图编制所建立的地震动衰减关系[J].震灾防御技术,2013,8(1):24-33.YU Yanxiang,LI Shanyou,XIAO Liang. Development of ground motion attenuation relations for the new sesimic Hazard map of China[J]. Technology for Earthquake Disaster Prevention,2013,8(1):24-33.(in Chinese)
[4]王海云.渭河盆地中土层场地对地震动的放大作用[J].地球物理学报,2011,54(1):137-150.WANG Haiyun. Amplification effects of soil sites on ground motion in the Weihe basin[J]. Chinese Journal of Geophys,2011,54(1):137-150.(in Chinese)
[5] GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Bulidings[S]. Beijing:China Architecture&Building Press,2010.(in Chinese)
[6] Lu M,Li X J,An X W,et al. A comparison of recorded response spectrum from the 2008 wenchuan,China,earthquake with modern ground-motion prediction model[J]. Bulletin of the Seismological Society of America,2010,100(5B):2357-2380.
[7]宋晋东,白琳娟,李山有,等. 2017年3月27日云南漾濞5. 1级地震强震动记录特征初步分析[J].地震工程与工程振动,2017,37(2):197-204.SONG Jindong,BAI Linjuan,LI Shanyou,et al. The characteristics of strong motion records of Yunnan Yangbi Ms 5. 1 Earthquake on March 27,2017[J]. Earthquake Engineering and Engineering Dynamics,2017,37(2):197-204.(in Chinese)
[8]任叶飞,温瑞智,山中浩明,等.运用广义反演法研究汶川地震场地效应[J].土木工程学报,2013,46(增刊2):146-151.REN Yefei,WEN Ruizhi,Yamanaka H,et al. Research on site of wenchuan earthquake by using generalized inversion technique[J]. China Journal of Rock Mechanics and Engineering,2013,46(S2):146-151.(in Chinese)
[9] Bommer J J,Martinez-Pereira A. The effective duration of earthquake strong motion[J]. Journal of Earthquake Engineering,1999,3(2):127-172.
[10] Arias A. A measure of earhquake intensity[M]//Hansen R J,ed. Seismic Design for Nuclear Power Plants. Cambridge,MA:Massachusetts Institute of Technology Press,438-483,1970.
[11] Bradley B A. Correlation of significant duration with amplitude and cumulative intensity measures and its use in ground motion selection[J],Journal of Earthquake Engineering,2011,15(6):809-832.
[12] Husid R. Gravity effects on earthquake response of yielding structures[D]. Los Angeles:California Institute of Technology,1967.
[2]中国地震局监测预报司.仪器地震烈度计算暂行规程[S].北京:地震出版社,2015.Department of Earthquake Monitoring and Prediction,China Earthquake Administration. Temp Specification of Instrumental Seismic Ientensity Calculation[S]. Beijing:Seismological Press,2015.(in Chinese)
[3]俞言祥,李山有,肖亮.为新区划图编制所建立的地震动衰减关系[J].震灾防御技术,2013,8(1):24-33.YU Yanxiang,LI Shanyou,XIAO Liang. Development of ground motion attenuation relations for the new sesimic Hazard map of China[J]. Technology for Earthquake Disaster Prevention,2013,8(1):24-33.(in Chinese)
[4]王海云.渭河盆地中土层场地对地震动的放大作用[J].地球物理学报,2011,54(1):137-150.WANG Haiyun. Amplification effects of soil sites on ground motion in the Weihe basin[J]. Chinese Journal of Geophys,2011,54(1):137-150.(in Chinese)
[5] GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Bulidings[S]. Beijing:China Architecture&Building Press,2010.(in Chinese)
[6] Lu M,Li X J,An X W,et al. A comparison of recorded response spectrum from the 2008 wenchuan,China,earthquake with modern ground-motion prediction model[J]. Bulletin of the Seismological Society of America,2010,100(5B):2357-2380.
[7]宋晋东,白琳娟,李山有,等. 2017年3月27日云南漾濞5. 1级地震强震动记录特征初步分析[J].地震工程与工程振动,2017,37(2):197-204.SONG Jindong,BAI Linjuan,LI Shanyou,et al. The characteristics of strong motion records of Yunnan Yangbi Ms 5. 1 Earthquake on March 27,2017[J]. Earthquake Engineering and Engineering Dynamics,2017,37(2):197-204.(in Chinese)
[8]任叶飞,温瑞智,山中浩明,等.运用广义反演法研究汶川地震场地效应[J].土木工程学报,2013,46(增刊2):146-151.REN Yefei,WEN Ruizhi,Yamanaka H,et al. Research on site of wenchuan earthquake by using generalized inversion technique[J]. China Journal of Rock Mechanics and Engineering,2013,46(S2):146-151.(in Chinese)
[9] Bommer J J,Martinez-Pereira A. The effective duration of earthquake strong motion[J]. Journal of Earthquake Engineering,1999,3(2):127-172.
[10] Arias A. A measure of earhquake intensity[M]//Hansen R J,ed. Seismic Design for Nuclear Power Plants. Cambridge,MA:Massachusetts Institute of Technology Press,438-483,1970.
[11] Bradley B A. Correlation of significant duration with amplitude and cumulative intensity measures and its use in ground motion selection[J],Journal of Earthquake Engineering,2011,15(6):809-832.
[12] Husid R. Gravity effects on earthquake response of yielding structures[D]. Los Angeles:California Institute of Technology,1967.