华北地区大地震矩释放率和GPS应变率的一致性研究  

On the Consistency of Large Earthquake Moment and Strain Rate Inferred from GPS Data in North China

作　　者：万永革[1] 沈正康[1] 甘卫军[1] 王爱军 

机构地区：[1]中国地震局地质研究所 [2]河北省馆陶县中学,河北省馆陶057750

出　　处：《中国地震》2005年第1期33-40,共8页Earthquake Research in China

基　　金：科技部重大基础前期研究 ( 2 0 0 3CCB0 0 60 0 );国家自然科学基金 ( 4 0 1740 19和 40 3 740 12 )共同资助

摘　　要：GPS测量技术可以在较大地区范围内获得高精度地壳形变速率。稳定的应变速率提供了精确确定地震活动率的机会。本文运用Kostrov(1 974)的公式将经平滑的华北地区应变速率转化为矩释放率 ,并与运用 1 30 3年洪洞地震以来的地震目录计算的矩释放率进行比较 ,发现两者之比南北向为 60 6% ,东西向为 68 9% ,北东剪切分量为 1 0 4 1 %。近似为 1的比率表明了GPS测量结果的可靠性。The new GPS data can map crustal strain rates over large areas with a useful degree of precision. Stable strain indicators open the door for space geodesy to join with seismology in formatting improved estimates of earthquake recurrence. The Kostrov's formula (1974) translates the smoothed strain rates in North China into geodetic moment rates. In North China, the ratio of seismic monent released to moment accumulated from GPS measurement is 60.6% in NS direction, 68.9% in EW direction, and 104.1% in NE shear direction. The near unit ratio points to the reliability of GPS measurements there. The combination of historical seismicity and GPS measurement offers a powerful attack on earthquake hazard.

关 键 词：华北地区 地震矩 震级 积累应变 

分 类 号：P315[天文地球—地震学]