汶川8.0级地震前BSQ型数字垂直摆倾斜仪观测到的地形变异常现象
|
摘要
地倾斜连续观测是地壳形变观测研究中重要内容。汶川8.0级地震前,布设在四川德阳金河测点的新型BSQ型数字垂直摆倾斜仪观测到了明显的地形变异常现象。分析其观测结果可知,汶川8.0级地震前约半月时间内德阳金河测点的地倾斜运动速度较过去的平均运动水平提高了数十倍,且震前地表快速倾斜的方向在N25°W左右。除此之外,德阳金河BSQ型数字垂直摆倾斜仪测点还观测到较为完整的,对应于可以反映地表应力集中、释放过程的震前地表破裂过程。上述现象为今后研究强震孕育机理提供了重要的信息。介绍与分析了布设在龙门山断裂带附近的其它类型地倾斜仪在震前的观测结果。事实证明,BSQ型数字垂直摆倾斜仪在强震前的浅表过程监测中具有重要意义,值得在今后的地震前兆台网工作中进行推广。
Continuous ground tilt observation is important in crustal deformation studies.The new BSQ model digital vertical pendulum tilt meter installed at Jinhe observation station in Deyang city,Sichuan Province caught abnormal ground deformation obviously before the Wenchuan 8.0 earthquake.According to the observation results,beginning from half a month before the earthquake,the ground tilt rates at the Jinhe station became tens of times stronger compared to that of before,and the tilt direction was about NW 25°.Besides,the BSQ model tilt meter here also got relatively complete information about stress accumulation and release before and during the earthquake process.It provided important information for studying strong earthquake process. The article also introduced the observation results from other kinds of tilt meters before the Wenchuan earthquake installed near the Longmenshan fault.This research proved that the BSQ model digital tilt meter can get more useful information about the deformation of ground surface,and worthy to be popularized.
Continuous ground tilt observation is important in crustal deformation studies.The new BSQ model digital vertical pendulum tilt meter installed at Jinhe observation station in Deyang city,Sichuan Province caught abnormal ground deformation obviously before the Wenchuan 8.0 earthquake.According to the observation results,beginning from half a month before the earthquake,the ground tilt rates at the Jinhe station became tens of times stronger compared to that of before,and the tilt direction was about NW 25°.Besides,the BSQ model tilt meter here also got relatively complete information about stress accumulation and release before and during the earthquake process.It provided important information for studying strong earthquake process. The article also introduced the observation results from other kinds of tilt meters before the Wenchuan earthquake installed near the Longmenshan fault.This research proved that the BSQ model digital tilt meter can get more useful information about the deformation of ground surface,and worthy to be popularized.
引文
①Ji C,Hayes G.2008.Preliminary result of the May 12,2008 Mw 7.9 eastern Sichuan,China earthquake.http://earthquake.usgs.gov/eqcenter/eqinthenews/2008/us2008ryan/finitefault.php.
②陈运泰,许力生,张勇,等.2008.2008年5月12日汶川特大地震震源特性分析报告.http://www.csi.ac.cn/Sichuan/chenyutai.pdf
Deng Qidong,Zhang Peizhen,Ran Yongkang,et al.2003.Activetectonics and earthquake activities in China[J].Earth ScienceFrontiers,10(Suppl):(67-73).(in Chinese with English abstract)
Hu Xingping,Yu Chunquan,Tao Kai,et al.2008.Focal mechanismsolutions of Wenchuan Earthquake and its strong aftershocksobtained from initial P wave polarity analysis[J].Chinese J.Geophys.,51(6):1711-1718.(in Chinese with English abstract)
Liu Chao,Zhang Yong,Xu Lisheng,et al.2008.A new technique formoment tensor inversion with applications to the 2008 WenchuanMs 8.0 earthquake sequence[J].Acta Seimologica Sinica,30(4):329-339.(in Chinese with English abstract)
Parsons T,Chen Ji,Kirby E.2008.Stress changes from the 2008Wenchuan earthquake and increased hazard in the Sichuan Basin[J].Nature,doi:10.1038/nature 07177.
Science and Technology Department,China Seismological Administration.1995.Technology of Earthquake Deformation Observation[M].Beijing:Seismological Press.(in Chinese)
Teng Jiwen,Bai Denghai,Yang Hui,et al.2008.Deep processesand dynamic responses associated with the Wenchuan Ms 8.0earthquake of 2008[J].Chinese J.Geophys.,51(5):1385-1402.(inChinese with English abstract)
Wang Weimin,Zhao Lianfeng,Li Juan,et al.2008.Rupture process ofthe Ms 8.0 Wenchuan earthquake of Sichuan,China[J].Chinese J.Geophys.,51(5):1403-1410.(in Chinese with English abstract)
Wu Xiulian and Han Yuepeng.1991.Research on anomalouscharacteristics of precursories before strong earthquake inXinjiang,China[G]//Science and Technology Department,ChinaSeismological Administration.Collected Works on EarthquakePrediction Methods(Crustal Deformation,Gravitation,Stress).Beijing:Seismological Press,4109-116.(in Chinese)
Zhang Peizhen,Xu Xiwei,Wen Xueze,et at.2008.Slip rates andrecurrence intervals of the Longmenshan active fault zone,andtectonic implications for the mechanism of the May 12 Wenchuanearthquake,2008,Sichuan,China[J].Chinese J.Geophys.,51(4):1066-1073.(in Chinese with English abstract)
邓起东,张培震,冉永康,等,2003.中国活动构造与地震[J].地学前缘,10(增刊):66-73.
胡幸平,俞春泉,陶开,等.2008.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,51(6):1711-1718.
刘超,张勇,许力生,等.2008.一种矩张量反演新方法及其对2008年汶川Ms8.0地震序列的应用[J].地震学报,30(4):329-339.
滕吉文,白登海,杨辉,等.2008.汶川Ms8.0地震发生的深层过程和动力学响应[J].地球物理学报,51(5):1385-1402.
王卫民,赵连锋,李娟,等.2008.四川汶川8.0级地震震源过程[J].2008.地球物理学报,51(5):1403-1410.
吴秀莲,韩月鹏.1991.新疆中强地震前的形变前兆研究[G]//国家地震局科技监测司.地震预报方法实用化研究文集(形变、重力、应变专辑).北京:地震出版社,109-116.
张培震,徐锡伟,闻学泽,等.2008.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,51(4):1066-1073.
中国地震局科技监测司.1995.地震形变观测技术[M].北京:地震出版社.
②陈运泰,许力生,张勇,等.2008.2008年5月12日汶川特大地震震源特性分析报告.http://www.csi.ac.cn/Sichuan/chenyutai.pdf
Deng Qidong,Zhang Peizhen,Ran Yongkang,et al.2003.Activetectonics and earthquake activities in China[J].Earth ScienceFrontiers,10(Suppl):(67-73).(in Chinese with English abstract)
Hu Xingping,Yu Chunquan,Tao Kai,et al.2008.Focal mechanismsolutions of Wenchuan Earthquake and its strong aftershocksobtained from initial P wave polarity analysis[J].Chinese J.Geophys.,51(6):1711-1718.(in Chinese with English abstract)
Liu Chao,Zhang Yong,Xu Lisheng,et al.2008.A new technique formoment tensor inversion with applications to the 2008 WenchuanMs 8.0 earthquake sequence[J].Acta Seimologica Sinica,30(4):329-339.(in Chinese with English abstract)
Parsons T,Chen Ji,Kirby E.2008.Stress changes from the 2008Wenchuan earthquake and increased hazard in the Sichuan Basin[J].Nature,doi:10.1038/nature 07177.
Science and Technology Department,China Seismological Administration.1995.Technology of Earthquake Deformation Observation[M].Beijing:Seismological Press.(in Chinese)
Teng Jiwen,Bai Denghai,Yang Hui,et al.2008.Deep processesand dynamic responses associated with the Wenchuan Ms 8.0earthquake of 2008[J].Chinese J.Geophys.,51(5):1385-1402.(inChinese with English abstract)
Wang Weimin,Zhao Lianfeng,Li Juan,et al.2008.Rupture process ofthe Ms 8.0 Wenchuan earthquake of Sichuan,China[J].Chinese J.Geophys.,51(5):1403-1410.(in Chinese with English abstract)
Wu Xiulian and Han Yuepeng.1991.Research on anomalouscharacteristics of precursories before strong earthquake inXinjiang,China[G]//Science and Technology Department,ChinaSeismological Administration.Collected Works on EarthquakePrediction Methods(Crustal Deformation,Gravitation,Stress).Beijing:Seismological Press,4109-116.(in Chinese)
Zhang Peizhen,Xu Xiwei,Wen Xueze,et at.2008.Slip rates andrecurrence intervals of the Longmenshan active fault zone,andtectonic implications for the mechanism of the May 12 Wenchuanearthquake,2008,Sichuan,China[J].Chinese J.Geophys.,51(4):1066-1073.(in Chinese with English abstract)
邓起东,张培震,冉永康,等,2003.中国活动构造与地震[J].地学前缘,10(增刊):66-73.
胡幸平,俞春泉,陶开,等.2008.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,51(6):1711-1718.
刘超,张勇,许力生,等.2008.一种矩张量反演新方法及其对2008年汶川Ms8.0地震序列的应用[J].地震学报,30(4):329-339.
滕吉文,白登海,杨辉,等.2008.汶川Ms8.0地震发生的深层过程和动力学响应[J].地球物理学报,51(5):1385-1402.
王卫民,赵连锋,李娟,等.2008.四川汶川8.0级地震震源过程[J].2008.地球物理学报,51(5):1403-1410.
吴秀莲,韩月鹏.1991.新疆中强地震前的形变前兆研究[G]//国家地震局科技监测司.地震预报方法实用化研究文集(形变、重力、应变专辑).北京:地震出版社,109-116.
张培震,徐锡伟,闻学泽,等.2008.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,51(4):1066-1073.
中国地震局科技监测司.1995.地震形变观测技术[M].北京:地震出版社.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心