论文部分内容阅读
将单台记录叠加频谱比法（简称SSR法）应用于震中距小于500km的区域地震Lg尾波为lHz下的值，n是与频率f有关的指数）的提取之中·为了检验方法的稳定性和可靠性，我们选用两组发生在不同地区的地震记录．一组是1989-10-18大同主震（ML＝5．9）的15个余震，北京遥测地震台网记录到的信噪比较高的Lg尾波序列。另一组是秦岭造山带数字流动地震观测台网记录到的1995年甘肃平凉两次地震信噪比较高的Lg尾波序列．每一组地震的震源参数基本相同，即它们到某一特定台站的路径几乎相同，得到的 可以认为是不受震源影响的地震一台站路径上的平均衰减效应·两区域 的测量结果表明：（1）尽管两个地震观测台网所用观测仪器不同，每个台站的观测条件不同，所记录的地震也不尽相同，但对Q_0和，的拟合结果线性程度都比较高，说明SSR法是稳定的；（2）同一震群的不同地震到某一特定台站测得的结果基本一致，即Q_0值及其平均值大都在其标准差范围之内，说明SSR法是可靠的。（3）对同一地震不同方位各台站的Lg尾波测量结果可以看出，穿过不同构造区的Q_0值存在明显差异,如果这些差异可以看作是构造上横向差异的表现，那么，如果选择方位分布好的一定数量的地震，而记录台站在研究区又具有合适分布，利用这些观测得到的?
Applying a single recording overlay spectral ratio method (referred to as SSR method) to the extraction of a seismic Lg coda at a frequency of 1 Hz and n an index related to the frequency f in a regional earthquake of less than 500 km in epicenter distance, in order to test the stability of the method Sex and reliability, we use two sets of seismograms that occurred in different regions. One is the 15 aftershocks of the Datong mainshock (ML = 5.9) from 1989-10-18. The Lg coda sequence with high signal-to-noise ratio recorded by Beijing telemetry network was used. The other group is the Lg coda sequence with high signal-to-noise ratio of the two earthquakes in Pingliang recorded in 1995 in Qinling orogenic belt. The hypocenter parameters of each group of earthquakes are basically the same, that is, the paths they reach to a particular station are almost the same, and the average attenuation effect on the path of a station can be considered as being independent of the earthquake source. : (1) Although the observational instruments used by the two seismic observational networks are different, the observational conditions are different for each station, and the recorded earthquakes are also different. However, the fitting results of Q_0 and are relatively linear, indicating that SSR method is stable; (2) The results of different earthquakes in the same earthquake swarm to a particular station are basically the same, that is, the value of Q_0 and its average are mostly within the standard deviation range, indicating that the SSR method is reliable . (3) For Lg coda measurements at different stations of the same earthquake, it can be seen that there are significant differences in Q_0 values across different tectonic zones. If these differences can be seen as a manifestation of structural lateral differences, then if Select a good number of azimuth distribution of the earthquake, and recording stations in the study area has a suitable distribution, the use of these observations obtained?