近场精确定位在卢龙M_L6.2地震发震构造研究中的应用
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摘要
从1982年10月19日卢龙6.2级地震余震近场数字地震资料的391条记录中,挑选出可用于精确定位的171条地震事件记录,采用Hypoinverse定位方法对45个事件进行了重定位.精确定位的震中分布显示出一卧倒的反“F”形活动地震构造的形态,两条NNE向断裂被一条WNW向断裂所截断,两组断裂呈脆性断裂常见的共轭状态产出,NNE向的断层正在相互贯通,卢龙附近的滦河河谷发育成了四面断裂包围的断陷盆地雏形.卢龙地震的发震构造是一个走滑兼张性的断裂组合,这样的构造与张家口—渤海地震带的整体活动习性相符,也反映了张渤带作为一个二级地块的分界截断NNE向的一系列断层所起的作用.
We have selected 171 near-field from 391 aftershock records of the Lulong, Hebei Province, earthquake in October 1982 and relocated the hypocenter of 45 aftershocks using the program Hypoinverse. The distribution of aftershocks reveals a set of earthquake faults: a WNW stretching fault truncates two NNE stretching faults. The two branches of faults show the conjugate structure which is often seen in brittle fracture. The NNE stretching faults are connected together. The Luanhe river valley near Lulong developed to a rudiment rift basin surrounded by a series of faults. The fault of Lulong earthquake is a strike-slip fault with tension component. This fault type matches with the activity of Zhangjiakou-Bohai seismic belt (Zhang-Bo belt) and also shows the action of Zhang-Bo belt as a boundary of two secondary active blocks that truncates the NNE fault.
We have selected 171 near-field from 391 aftershock records of the Lulong, Hebei Province, earthquake in October 1982 and relocated the hypocenter of 45 aftershocks using the program Hypoinverse. The distribution of aftershocks reveals a set of earthquake faults: a WNW stretching fault truncates two NNE stretching faults. The two branches of faults show the conjugate structure which is often seen in brittle fracture. The NNE stretching faults are connected together. The Luanhe river valley near Lulong developed to a rudiment rift basin surrounded by a series of faults. The fault of Lulong earthquake is a strike-slip fault with tension component. This fault type matches with the activity of Zhangjiakou-Bohai seismic belt (Zhang-Bo belt) and also shows the action of Zhang-Bo belt as a boundary of two secondary active blocks that truncates the NNE fault.
引文
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王培德.1987.近震源强地面运动研究[D]:[学位论文].北京:国家地震局地球物理研究所,56
徐杰,宋长青,楚全芝.1998.张家口—蓬莱断裂带地震构造特征的初步探讨[J].地震地质,20(2):146～154
杨国华,谢觉民,韩月萍.2001.华北主要构造单元及边界带现近水平形变与运动机制[J].地球物理学报,44(5):645～653
杨理华,刘德林,赵喜柠,等.1989.北京、天津、河北地震构造[A].见:马杏垣主编.中国岩石圈动力学地图集[C].北京:中国地图出版社,30
张培震,邓起东,张国民,等.2003.中国大陆的强震活动与活动块体[J].中国科学,D缉,33(增刊):12～20
JaegerJC,CookNGW著.1979.中国科学院工程力学研究所译.1981.岩石力学基础[M].北京:科学出版社,94～133
WuFT,SongLY,WangPD.1984.AgroundmotionsynthesisstudyusingsmallearthquakeasGreen′sfunction[A].In:TongjiUniversityed.ProceedingsofInternationalWorkshoponEarthquakeEngineering[C].Shanghai:TongjiUniversity Press,87～99
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