| 含裂隙介质中地震波传播的振幅异常 |
| |
| 引用本文： | 冯德益,顾瑾平,李清河.含裂隙介质中地震波传播的振幅异常[J].地震学报,1983,5(2):158-168. |
| |
| 作者姓名： | 冯德益 顾瑾平 李清河 |
| |
| 作者单位： | 国家地震局兰州地震研究所 |
| |
| 摘 要： | 本文首先利用两相介质模型从理论上简要分析了地震波在含裂隙介质中的传播特性.由初步理论研究结果与简单计算实例可以看出,在含裂隙介质或两相介质中有可能发现并观测到地震波形状与振幅的某些变化.其次,利用马鞍山矿区爆破及唐山、松潘、马边、康定等地区小地震的观测资料,着重提出了研究大震前振幅异常或振幅比异常的一些实际方法,认为大震前外围介质已属于微破裂介质或两相介质.得出并详细研究了震前振幅异常,尤其是振幅比异常的一些基本特性.最后,本文对影响到振幅异常的发现与分析的某些因素作了简要的讨论.文中所得结果与初步结论可能有助于地震预报的研究工作.
|
ANOMALOUS AMPLITUDE VARIATIONS OF SEISMIC WAVES PROPAGATING IN FRACTURED MEDIA |
| |
| Institution: | Seismological Institute of Lamhou, State Seismological Bureau |
| |
| Abstract: | This paper begins briefly with a theoretical analysis of the propagation of seismie waves in fractured media, using a two-phase model of the media. Based on this preliminary theoretical result, and simple computational examples of wave propagation, it could be shown that possible changes in the form and amplitude of seismic waves in fractured two-phase media may be observed.Using observational data of explosions at the Maanshan Iron Mine and some small earthquakes occurred in Tangshan, Songpan, Mabian, Kangding and other seismic active regions, practical methods for studying anomalous amplitude or amplitude ratio before large earthquakes have been proposed. It is believed that the media surrounding their hypocenters were fractured or in two-phase.Some basic characteristics of amplitude anomaly, especially amplitude ratio anomaly appeared before those major earthquakes have been studied in detail.Finally several factors affecting the detection and analysis of amplitude anomalies are briefly discussed. Results and pre liminary conclusions thus obtained might be helpful for studies of earthquake prediction. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地震学报》浏览原始摘要信息 |
| 点击此处可从《地震学报》下载免费的PDF全文 |
|
