广元市地震波能量分布特征及地质灾害响应
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摘要
根据汶川地震中广元市曾家站记录的强震数据及地震诱发崩滑的野外资料,对地震波能量分布特征进行了研究,得出广元市地震波能量最集中的时间段为60～80s,主要频率约为2.7Hz。在此基础上,分别从地形地貌、地层岩性、地质构造及地震波特性几个方面,初步分析了研究区地震诱发地质灾害在空间上的响应特征。研究区地质灾害的空间分布集中在800～1 800m的低、中山区;30°～50°的坡度地段;易破碎、发育裂隙的变质岩、软硬岩互层的地层;断裂构造延伸方向、断裂构造交汇处以及山体斜坡地脉动卓越频率大于地震动主频率的地区。研究区内东河口滑坡发生在地震波能量最强烈最集中的时段,经研究表明,该区地质灾害的时空响应特征与地震波能量在时间及空间上的分布有较好的一致性。
According to the strong ground motion records from the Wenchuan earthquake at the Zengjia station in Guangyuan and the field data of the earthquake-induced collapse and landslide,the distribution of seismic wave energy was investigated in this study.The results suggested that the period of the largest accumulation of seismic wave energy is 60~80 s and the main frequency is about 2.7 Hz.Following this,this paper analyzed the spatial characteristics of the response of the earthquake-induced geologic hazards in the study area from the aspects of geomorphology,lithology,geological structure,and performance of earthquake wave.The geologic hazards occurred mainly at the mountain area with an elevation of 800~1800 m;at the area with a gradient of 30°~50°;at the metamorphic rock stratum with intense weathering and fracture development,and the stratum with an interbedding of soft and hard rock;and at the area of the extension direction and intersection of the fault structure,and the area with a higher predominant frequency than the main frequency of the ground motion.In the study area,the Donghekou landslide occurred in a period with the most cumulative of seismic energy.Moreover,the results indicated that the spatial and temporal characteristics of the response of the geologic hazards are consistent with those of the seismic energy.
According to the strong ground motion records from the Wenchuan earthquake at the Zengjia station in Guangyuan and the field data of the earthquake-induced collapse and landslide,the distribution of seismic wave energy was investigated in this study.The results suggested that the period of the largest accumulation of seismic wave energy is 60~80 s and the main frequency is about 2.7 Hz.Following this,this paper analyzed the spatial characteristics of the response of the earthquake-induced geologic hazards in the study area from the aspects of geomorphology,lithology,geological structure,and performance of earthquake wave.The geologic hazards occurred mainly at the mountain area with an elevation of 800~1800 m;at the area with a gradient of 30°~50°;at the metamorphic rock stratum with intense weathering and fracture development,and the stratum with an interbedding of soft and hard rock;and at the area of the extension direction and intersection of the fault structure,and the area with a higher predominant frequency than the main frequency of the ground motion.In the study area,the Donghekou landslide occurred in a period with the most cumulative of seismic energy.Moreover,the results indicated that the spatial and temporal characteristics of the response of the geologic hazards are consistent with those of the seismic energy.
引文
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[2]王秀英,聂高众,王登伟.利用强震记录分析汶川地震诱发滑坡[J].岩石力学与工程学报,2009,28(11):2369-2376.(WANGXiu-ying,NIE Gao-zhong,WANG Deng-wei.Analysis of Land-slide Induced by Wenchuan Earthquake by Strong Motion Re-cords[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(11):2369-2376.(in Chinese))
[3]于海英,王栋,杨永强,等.汶川8.0级地震强震动加速度记录的初步分析[J].地震工程与工程振动,2009,29(1):1-13.(YU Hai-ying,WANG Dong,YANG Yong-qiang,et al.The Preliminary A-nalysis of Strong Ground Motion Records From the Ms8.0 Wen-chuan Earthquake[J].Journal of Earthquake Engineering and Engi-neering Vibration,2009,29(1):1-13.(in Chinese))
[4]谢俊举,温增平,高孟潭,等.2008年汶川地震近断层地震动的非平稳特征[J].地球物理学报,2011,54(3):728-736.(XIEJun-ju,WEN Zeng-ping,GAO Meng-tan,et al.Non-StationaryCharacteristics of Near-Fault Strong Motions During the 2008Wenchuan Earthquake[J].Chinese Journal of Geophysics,2011,54(3):728-736.(in Chinese))
[5]凌昊平.四川省青川县地质灾害危险性评价与防治对策研究[D].成都:成都理工大学硕士论文,2008.(LING Hao-ping.AResearch on Geological Disaster Riskassessment and the Meas-ure of Prevention in Qingchuan Cunty of Sichuan Povince[D].Chengdu:Chengdu University of Technology,2008.(in Chi-nese))
[6]中国地震局震害防御司.汶川8.0级地震未校正加速度记录[M].中国强震记录汇报,第十二集,第一卷,北京:地震出版社,2008.(Department of Earthquake Disaster Prevention,Chi-na Seismological Bureau.Report on Strong Motion Records inChina[M].Beijing:Seismological Press,2008.(in Chinese))
[7]王秀英,聂高众,王登伟.汶川地震诱发滑坡与地震动峰值加速度对应关系研究[J].岩石力学与工程学报,2010,29(1):82-89.(WANG Xiu-ying,NIE Gao-zhong,WANG Deng-wei.Researchon Rlationship Btween Lndslides and Pak Gound AcelerationsIduced by Wenchuan Erthquake[J].Chinese Journal of Rock Me-chanics and Engineering,2010,29(1):82-89.(in Chinese))
[8]Li X J,Zhou Z H,Huang M,et al.Preliminary Aalysis ofSrong-motionrecordings Fom the Mgnitude 8.0 Wenchuan,China,Earthquake of 12 May 2008[J].Seismological ResearchLetters,2008,79(6):844-854.
[9]周荣军,赖敏,余桦,等.汶川Ms8.0地震四川及邻区数字强震台网记录[J].岩石力学与工程学报,2010,29(9):1850-1858.(ZHOU Rong-jun,LAI Ming,YU-Hua,et al.Strong motionRecords of Wenchuan Ms8.0Earthquake From Digital StrongEarthquake Networks in Sichuan and its Neighbor Regions[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(9):1850-1858.(in Chinese))
[10]陈晓利,李传友,王明明,等.断裂带两侧地震诱发滑坡空间分布差异性的主要影响因素研究———以北川地区的地震滑坡分布为例[J].地球物理学报,2011,54(3):737-746.(CHEN Xi-ao-li,LI Chuan-you,WANG Ming-ming,et al.The Main Fac-tors Causing th seismic Landslide Distribution Difference ontwo Sides of the Faults-A Case Study of Landslide Distribu-tion in Beichuan area[J].Chinese Journal of Geophysics,2011,54(3):737-746.(in Chinese))
[11]谢礼立,周雍年.一个新的地震动持续时间定义[J].地震工程与工程振动,1984,4(2):27-35.(XIE Li-li,ZHOU Yong-nian.A new Definition of Strongground Motion Duration[J].Jour-nal of Earthquake Engineering and EngineeringVibration,1984,4(2):27-35.(in Chinese))
[12]胡聿贤.地震工程学(第二版)[M].北京:地震出版社,2006.(HU Yu-xian.Earthquake Engineering[M].Beijing:Seismo-logical Press,2006.(in Chinese))
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