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根据地壳速度结构模型,给出了利用厂坝爆破适于天水—礼县地区的各个传输台站不同震相的走时模型。以此为基础,对比分析了从1984年11月至1987年5月共31个月的资料,讨论了零时序列、走时差序列、相对走时序列、计算零时序列和波速比序列的特征。较详细地分析了迭部M_s=5.9地震过程中上述序列的反映。确认了走时出现多—少的变化特征、波速比的低—高—发震的特征、震前几天走时特殊低、波速比很高的特征和波速的方向性特征。经过误差讨论与统计检验确认上述特征是可信的。最后,又讨论了如何利用地震波运动学特征监视和预报地震。由于地震波透视这种方法物理意义清晰,许多因素已知,精度较高,故所得结论不仅有理论意义,而且有实用价值。
According to the crustal velocity structure model, the traveltime models of different seismic phases of various transmission stations that are suitable for blasting in Tianshui-Li County are given. Based on this, the data of 31 months from November 1984 to May 1987 were comparatively analyzed. The characteristics of zero-sequence, lag-lag, relative traveltime series, and the calculation of zero-hour series and wave speed ratio sequences were discussed. The reflection of the above sequence in the M_s = 5.9 earthquake process is analyzed in detail. The characteristics of multi - and small variations in travel time, low - high - earthquakes with wave speed ratio, special low travel times in the days before earthquakes, and high directional characteristics of wave velocity and directional characteristics of wave velocity were confirmed. After the error discussion and statistical tests to confirm the above characteristics are credible. Finally, we discuss how to use the seismic kinematics to monitor and predict earthquakes. Due to the clear physical meaning of seismic wave perspective, many factors are known and the precision is high, so the conclusion is not only of theoretical significance but also of practical value.