2011年4月10日四川炉霍Ms 5.3级地震强震记录与震害特点
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摘要
四川数字强震台网中的9个台站获取了2011年4月10日四川炉霍Ms5.3级地震完整的三分向加速度记录,高频成分丰富,频谱主要成分集中在0.1～0.3s之间,最大加速度值为炉霍台EW向405.8cm/s2。震后的地震宏观考察结果表明,本次地震的极震区地震烈度达Ⅶ度,等震线沿鲜水河断裂呈NW-SE向的不规则椭圆形,NW部的面积明显大于SE部。综合分析认为,震区建筑物自振周期与本次地震加速度反应谱的高频成分高度吻合是震害偏重的主要原因,"崩科"藏式建筑抗震性能较差亦加重了震害。联系到本次地震P波向NW方向传播速度明显快于SE方向、等震线形态以及余震稀少等事实,推测这次地震系2010年4月14日青海玉树Ms7.1级地震的远程触发,导致鲜水河断裂上应力调整而产生弹性回跳的结果。
In the Luhuo Ms 5.3 earthquake three components of the earthquake acceleration were recorded by the nine strong-motion stations of the Sichuan digital seismic network.The high frequency parts of the seismic wave are plentiful and the main components of its spectrum is between 0.1-0.3 s.The maximum EW-orientated value of the acceleration recorded by the Luhuo station is 405.8 cm/s2.According to the survey of the earthquake damages,the intensity of the meizoseismal area is Ⅶ degree.The isoseismic line is shaped as an anomalous ellipse and the orientation of its long axis is NW-SE orientation along the Xianshuihe fault.The area of the NW part of the intensity area is obviously larger than that of the SE part.The natural vibration period of the buildings is consistent with the high frequency components of the seismic acceleration.Thus,this made the damages more seriously.The poor antiseismic performance of "Bengke"(the style of the Tibetan building) is another causation for the serious destroy.The NW-orientated propagation velocity of the P wave is faster than the SE-orientated one and the aftershock is so exiguous.All the above suggests that the Ms 7.1 earthquake occurred in Yushu County of Qinghai Province on April 14,2010 led to the stress adjustment and the elastic rebound on the Xianshuihe fault,so as to trigger the Luhuo Ms 5.3 earthquake.
In the Luhuo Ms 5.3 earthquake three components of the earthquake acceleration were recorded by the nine strong-motion stations of the Sichuan digital seismic network.The high frequency parts of the seismic wave are plentiful and the main components of its spectrum is between 0.1-0.3 s.The maximum EW-orientated value of the acceleration recorded by the Luhuo station is 405.8 cm/s2.According to the survey of the earthquake damages,the intensity of the meizoseismal area is Ⅶ degree.The isoseismic line is shaped as an anomalous ellipse and the orientation of its long axis is NW-SE orientation along the Xianshuihe fault.The area of the NW part of the intensity area is obviously larger than that of the SE part.The natural vibration period of the buildings is consistent with the high frequency components of the seismic acceleration.Thus,this made the damages more seriously.The poor antiseismic performance of "Bengke"(the style of the Tibetan building) is another causation for the serious destroy.The NW-orientated propagation velocity of the P wave is faster than the SE-orientated one and the aftershock is so exiguous.All the above suggests that the Ms 7.1 earthquake occurred in Yushu County of Qinghai Province on April 14,2010 led to the stress adjustment and the elastic rebound on the Xianshuihe fault,so as to trigger the Luhuo Ms 5.3 earthquake.
引文
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[12]何玉林,张勤.2001年四川省雅江—康定6.0级地震烈度考察及发震构造背景雏议[J].地震学报,2002,24(1):57-66.He Y l,Zhang Q.Investigation on intensity distri-bution and seismogenic structure of the 2001Yajiang-Kangding earthquake of M 6.0[J].ActaSeismologica Sinica,2002,24(1):57-66.(In Chi-nese)
[13]Taira T,Sliver P G,Niu F L,et al.Remote trigge-ring of fault-strength changes on the San Andreasfault at Parkfield[J].Nature,2009,461:636-639.
[14]Lei X L,Xie C D,Fu B H.Remotely triggered seis-micity in Yunnan,southwestern China,followingthe 2004 Mw 9.3Sumatra Earthquake[J].Journalof Geophysical Research,2011,116:1-13.doi:10.1029/2011JB008245.
[15]闻学泽,马胜利.唐山大地震对相邻断裂段地震复发的影响[J].自然科学进展,2006,16(10):1346-1350.Wen X Z,Ma S L.Tangshan earthquake of adjacentfracture section of the influence of earthquake recur-rence[J].Advances in Natural Science,2006,16(10):1346-1350.(In Chinese)
[16]张秋文,张培震,王乘,等.鲜水河断裂带断层间相互作用的触震与缓震效应[J].地震学报,2003,25(2):143-153.Zhang Q W,Zhang P Z,Wang C,et al.Earth-quake triggering and delaying caused by fault inter-action on Xianshuihe fault belt,Southwestern China[J].Acta Seismologica Sinica,2003,25(2):143-153.(In Chinese)
[17]四川省地震局.四川数字强震观测网络建设[R].成都:四川省地震局,2007.Earthquake Administration of Sichuan Province.Si-chuan Digital Earthquake Observation Network Con-struction[R].Chengdu:Earthquake Administrationof Sichuan Province,2007.(In Chinese)
[2]钱洪.鲜水河断裂带上潜在震源区的地质学判定[J].四川地震,1988(2):14-18.Qian H.The decision on potential source area geolo-gy of Xianshuihe fault[J].Earthquake Research in Si-chuan,1988(2):14-18.(In Chinese)
[3]吕江宁,沈正康,王敏.川滇地区现代地壳运动速度场和活动块体模型研究[J].地震地质,2003,25(4):543-554.Lyu J N,Shen Z K,Wang M.Contemporary crustaldeformation and active tectonic block model of the Si-chuan,Yunnan region,China[J].Seismology andGeology,2003,25(4):543-554.(In Chinese)
[4]闻学泽.鲜水河全新世断裂带的分段性、几何特征及其地震构造意义[J].地震学报,1989,11(4):362-372.Wen X Z.Segmentation,geometric features,andtheir seismotectonic implications for the HoloceneXianshuihe fault zone[J].Acta Seismologica Sinica,1989,11(4):362-372.(In Chinese)
[5]周荣军,何玉林,黄祖智,等.鲜水河断裂乾宁—康定段的滑动速率与强震复发间隔[J].地震学报,2001,23(2):250-261.Zhou R J,He Y L,Huang Z Z,et al.The slip rateand str0ng earthquake recurrence interval on theQianning Kangding segment of the Xianshuihe faultzone[J].Acta Seismologica Sinica,2001,23(2):250-261.(In Chinese)
[6]张培震,邓起东,张国民,等.中国大陆的强震活动与活动地块[J].中国科学:D辑,2003,33(增刊):12-20.Zhang P Z,Deng Q D,Zhang G M,et al.The main-land of China earthquake activity and activity block[J].Science in China(Series D),2003,33(S):12-20.(In Chinese)
[7]袁一凡.GB/T18208.4-2005,地震现场工作:第4部分:灾害直接损失评估[S].北京:地震出版社,2007.Yuan Y F.GB/T 18208.4-2005,The EarthquakeField Work(Part 4):Disaster Direct Loss Evaluation[S].Beijing:Seismological Press,2007.(In Chi-nese)
[8]国家质量技术监督局.GB/T17742-2008,中华人民共和国国家标准:中国地震烈度表[S].The National Quality Technology Supervision Bu-reau.GB/T 17742-2008,The National Standard ofthe People's Republic of China:China's Seismic In-tensity Table[S].(In Chinese)
[9]朱亚军.道孚民居研究[J].西藏艺术研究,2007(3):61-68.Zhu Y J.The dwellings research of Daofu[J].Tibet-an Art Research,2007(3):61-68.(In Chinese)
[10]崔建友,陈德彬.四川巴塘地震震害调查[J].工程抗震,1990(4):45-48.Cui J Y,Chen D B.The earthquake damage investi-gation of Batang of Sichuan Province[J].The Re-sistance of Engineering Earthquake,1990(4):45-48.(In Chinese)
[11]何玉林,张勤,贾晋康,等.2001年2月23日四川省雅江—康定6.0级地震震灾调查及经济损失快速评估[J].四川地震,2001(4):9-16.He Y L,Zhang Q,Jia J K,et al.Earthquake disas-ter investigation and assessment of Yajiang-Kangding M 6.0earthquake in Sichuan Province[J].Earthquake Research in Sichuan,2001(4):9-16.(In Chinese)
[12]何玉林,张勤.2001年四川省雅江—康定6.0级地震烈度考察及发震构造背景雏议[J].地震学报,2002,24(1):57-66.He Y l,Zhang Q.Investigation on intensity distri-bution and seismogenic structure of the 2001Yajiang-Kangding earthquake of M 6.0[J].ActaSeismologica Sinica,2002,24(1):57-66.(In Chi-nese)
[13]Taira T,Sliver P G,Niu F L,et al.Remote trigge-ring of fault-strength changes on the San Andreasfault at Parkfield[J].Nature,2009,461:636-639.
[14]Lei X L,Xie C D,Fu B H.Remotely triggered seis-micity in Yunnan,southwestern China,followingthe 2004 Mw 9.3Sumatra Earthquake[J].Journalof Geophysical Research,2011,116:1-13.doi:10.1029/2011JB008245.
[15]闻学泽,马胜利.唐山大地震对相邻断裂段地震复发的影响[J].自然科学进展,2006,16(10):1346-1350.Wen X Z,Ma S L.Tangshan earthquake of adjacentfracture section of the influence of earthquake recur-rence[J].Advances in Natural Science,2006,16(10):1346-1350.(In Chinese)
[16]张秋文,张培震,王乘,等.鲜水河断裂带断层间相互作用的触震与缓震效应[J].地震学报,2003,25(2):143-153.Zhang Q W,Zhang P Z,Wang C,et al.Earth-quake triggering and delaying caused by fault inter-action on Xianshuihe fault belt,Southwestern China[J].Acta Seismologica Sinica,2003,25(2):143-153.(In Chinese)
[17]四川省地震局.四川数字强震观测网络建设[R].成都:四川省地震局,2007.Earthquake Administration of Sichuan Province.Si-chuan Digital Earthquake Observation Network Con-struction[R].Chengdu:Earthquake Administrationof Sichuan Province,2007.(In Chinese)
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