龙门山断裂带WFSD数字地震台网监测能力及动态范围分析
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摘要
5.12汶川特大地震后,为了监测地震的发展趋势,探讨大范围的构造应力场作用,在龙门山断裂带上及时布设临时数字地震台网。数字台网由11个数字地震台组成,遍布龙门山断裂带的北东缘和南西端。为了分析WFSD数字地震台网监测能力及其动态范围,随机抽取一定数量台站观测数据,通过傅立叶变换和功率谱密度分析,获得台基地动噪声均值,进而分析观测系统的动态范围和台网监测能力。根据计算结果与记录的大量微震对比研究,表明在龙门山断裂带上,WFSD数字地震台网具有监测ML 1.5级微地震的能力,且与中国地震局台网中心发布的地震结果基本吻合。因此,WFSD数字地震台网可为龙门山断裂带变形机制研究提供基础的观测资料。
After the 5.12 earthquake in Wenchuan,the temporary digital seismic network has been layout in time in Longmenshan fault zone in order to monitor earthquake trends and probe into the large-scale tectonic stress field activity.Digital seismic network is made of 11 digital seismic instruments,and which are arranged at north eastern margin and southwestern side of Longmenshan fault zone.A certain number of data from observation stations are randomly selected in order to analyze the monitoring capability and dynamic range of WFSD digital seismic network.The dynamic noises of station base are acquired through the Fourier Transform and power spectral density analysis.And then,the dynamic range of observing systems and monitoring capacity of network are analyzed.WFSD digital seismic network has a monitoring ML1.5 micro-seismic capacity in Longmenshan fault zone based on Comparing the computing results with the record of a large number of micro-seismic.And it basically accorded with the results of that by Seismological Bureau Networks Center of China.Therefore,WFSD digital seismic network can provide a basic observing datum for the deformation mechanism research of Longmenshan fault zone.
After the 5.12 earthquake in Wenchuan,the temporary digital seismic network has been layout in time in Longmenshan fault zone in order to monitor earthquake trends and probe into the large-scale tectonic stress field activity.Digital seismic network is made of 11 digital seismic instruments,and which are arranged at north eastern margin and southwestern side of Longmenshan fault zone.A certain number of data from observation stations are randomly selected in order to analyze the monitoring capability and dynamic range of WFSD digital seismic network.The dynamic noises of station base are acquired through the Fourier Transform and power spectral density analysis.And then,the dynamic range of observing systems and monitoring capacity of network are analyzed.WFSD digital seismic network has a monitoring ML1.5 micro-seismic capacity in Longmenshan fault zone based on Comparing the computing results with the record of a large number of micro-seismic.And it basically accorded with the results of that by Seismological Bureau Networks Center of China.Therefore,WFSD digital seismic network can provide a basic observing datum for the deformation mechanism research of Longmenshan fault zone.
引文
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[2]张永双,石菊松,孙萍,等.汶川地震内外动力耦合及灾害实例[J].地质力学学报,2009,15(2):131～141.ZHANG Yong-shuang,SHI Ju-shong,SUN Ping,et al.Coupling between endogenic and exogenic geological processes inthe Wenchuan earthquake and example analysis of geo-hazards[J].Journal of Geomechanics,2009,15(2):131～141.
[3]谭成轩,孙叶,吴树仁,等.5.12汶川MS 8.0大地震后关于我国区域地壳稳定性评价的思考[J].地质力学学报,2009,15(2):142～150.TAN Cheng-xuan,SUN Ye,WU Shu-ren,et al.A consideration on regional crustal stability assessment after Ms 8.0Wenchuan strong earthquake in China[J].Journal of Geomechanics,2009,15(2):142～150.
[4]王连捷,崔军文,周春景,等.汶川5.12地震发震机理的数值模拟[J].地质力学学报,2009,15(2):105～113.WANG Lian-jie,CUI Jun-wen,ZHOU Chun-jing,et al.Numerical modeling for Wenchuan earthquake mechanism[J].Journal of Geomechanics,2009,15(2):105～113.
[5]姚鑫,张永双.基于差分干涉雷达的汶川地震同震形变特点[J].地质力学学报,2009,15(2):151～161.YAO Xin,ZHANG Yong-shuang.Co-seismic Deformation of“5.12”Wenchuan earthquake based on D-INSAR[J].Journal of Geomechanics,2009,15(2):151～161.
[6]许志琴,李海兵,吴忠良.汶川地震和科学钻探[J].地质学报,2008,82(12):1613～1622.XU Zhi-qin,LI Hai-bing,WU Zhong-liang.Wenchuan earthquake and scientific drilling[J].Acta Geologica Sinica,2008,82(12):1613～1622.
[7]张宏志,刁桂苓,陈祺福.1976年唐山7.8级地震震区现今地震震源机制分析[J].地震研究,2008,31(1):1～6.ZHANG Hong-zhi,DIAO Gui-ling,CHEN Qi-fu.Focal mechanism analysis of the recent earthquakes in Tangshan seismicregion of M 7.6 in 1976[J].Journal of Seismological Research,2008,31(1):1～6.
[8]张永双,雷伟志,石菊松,等.四川5.12地震次生地质灾害的基本特征初析[J].地质力学学报,2008,14(2):110～116.ZHANG Yong-shuang,LEI Wei-zhi,SHI Ju-song,et al.General characteristics of 5.12 earthquake induced geo-hazards inSichuan[J].Journal of Geomechanics,2008,14(2):110～116.
[9]王连捷,周春景,孙东生,等.汶川5.12地震引起的库仑应力变化及其对周边地震活动的影响[J].地质力学学报,2008,14(3):193～200.WANG Lian-jie,ZHOU Chun-jing,SUN Dong-sheng.Coulomb stress changes caused by Wenchuan earthquake and itsinfluence on seismic activity in the adjacent area[J].Journal of Geomechanics,2008,14(3):193～200.
[10]彭华,马秀敏,姜景捷.龙门山北端青川断层附近应力测量与断层稳定性[J].地质力学学报,2009,15(2):114～130.PENG Hua,MA Xiu-min,JIANG Jing-jie.Stability and stress measurement near the Qingchuan fault in the northernLongmen Mountains[J].Journal of Geomechanics,2009,15(2):114～130.
[11]刘树根,田小彬,李智武.龙门山中段构造特征与汶川地震[J].成都理工大学学报:自然科学版,2008,35(4):388～397.LIU Shu-gen,TIAN Xiao-bin,LI Zhi-wu.Structural features of the central Longmen Mountains and the Wenchuanearthquake in Sichuan,China[J].Journal of Chengdu University of Technology:Science&Technology Edition,2008,35(4):388～397.
[12]Zhang P Z,Shen Z,Wang M,et al.Continuous deformation of the Tibetan Plateau from Global Positioning System data[J].Geology,2004,32:809～812.
[13]李涌,张艺,戴仕贵.阿坝州数字地震台网的动态范围与台网监控能力计算[J].四川地震,2007,4:37～41.LI Yong,ZHANG Yi,DAI Shi-gui.Dynamic range and monitoring ability computation results of the Digital Seismic Networkof Aba Prefecture[J].Earthquake Research in Sichuan,2007,4:37～41.
[14]邵玉平,王翠芳,宋澄.地震台网勘选数据的自动化处理[J].四川地震,2008,1:9～12.SHAO Yu-ping,WANG Cui-fang,SONG Cheng.The automation of site survey data processing for seismic network[J].Earthquake Research in Sichuan,2008,1:9～12.
[15]唐明帅,段天山.“十五”新疆数字地震台网建设[J].地震地磁观测与研究,2007,28(6):58～62.TANG Ming-shuai,DUAN Tian-shan.An introduction of“the Tenth Five-year Plan”digital earthquake networkconstruction in Xinjiang[J].Seismological and Geomagnetic Observation and Research,2007,28(6):58～62.
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