【作者】 袁怀玉； 陈晓非；

【Author】 Yuan Huaiyu Chen Xiaofei (Department of Geophysics,Peking University,Beijing,100871)

【机构】 北京大学地球物理系；

【摘要】 我们用面波高斯光束方法并结合陈晓非1993年提出的计算面波简正振型问题的新方法,利用CDSN的BJT台的宽频带地震资料,对1998年1月10日的张北-尚义地震所激发的短周期面波对北京地区的影响做了初步研究。通过波形拟合我们研究了地震定位的时空参数、震源参数以及介质的衰减特性对计算面波高斯光束合成地震图的影响。结果表明,面波高斯光束方法是研究弱横向非均匀介质中短周期面波问题的有效方法,它不仅可以用于研究短周期面波的传播特性,也可以研究震源参数。根据本文的初步分析与研究,我们发现该地震在北京地区的长周期强地面运动主要来自于8.2s的勒夫波。这一结果将有助于地震工程及抗震设计等问题的究。更多还原

【Abstract】 We investigate the influences of short-period surface wave generated by Zhangbei-Sangyi Earthquake of 1998 on the metropolitan Beijing area by analyzing the broadband seismic data at BJT of CDSN through the method of surface wave Gaussian beam hybridized with Chen’s new algorithm of computing normal modes.By fitting the seismic waveform,we study the influences of seismic source location,focal depth,moment and media attenuation property on synthesizing surface wave Gaussian beams seismogram.Our results show that surface wave Gaussian beams method is an effective method for studying the short-period surface waves in slightly lateral heterogeneous media.It can be used to study not only the problem of short period surface wave propagation in lateral heterogeneous media,but also seismic source parameters.According to our preliminary results,we find that major seismic energy comes from the Love wave with period of 8.2 second.更多还原