论文部分内容阅读
本文分析了新疆区域地震台网连续11年的观测资料,对一些中强震前直达纵横波速度比V_p/V_s的异常特性作了初步探讨,给出典型震例20个。所得主要结果是:(1)V_p/V_s表现为“下降——回升——发震——震后异常”的形态;(2)异常持续时间与主震震级大致呈单对数直线关系;(3)V_p/V_s异常区内,远离震中一端首先出现异常,而且幅度最大;(4)主震震中位于V_p/V_s异常区靠边部位;(5)V_p/V_s平均最大异常幅度一般为5％左右。此外,还讨论了V_p/V_s异常与地震类型,震源机制的关系。 文中还对V_p/V_s的预报能力进行了分析检验,讨论了较为成功的预报震例和虚、漏报次数及其原因。最后,对所得结果及其在地震预报中的应用进行了讨论。
This paper analyzes the observation data of Xinjiang Seismological Network for eleven consecutive years and probes into some anomalous characteristics of Vp / V_s before moderate earthquakes. There are 20 typical seismic cases. The main results obtained are as follows: (1) Vp / V_s behaves as a “drop-rise-seismogenic-post-earthquake anomaly” pattern; (2) the duration of the anomaly is approximately single logarithmically linear with respect to the mainshock magnitudes; 3) In the anomaly region of V_p / V_s, the anomaly first appears far away from the epicenter and the amplitude is the largest; (4) The epicenter of the main epicenter is located at the edge of the anomaly region of V_p / V_s; (5) The average maximum anomaly amplitude of V_p / V_s is about 5% . In addition, the relationship between V_p / V_s anomaly and earthquake type and focal mechanism is also discussed. In the paper, the forecasting ability of V_p / V_s is also analyzed and tested. The more successful earthquake prediction cases, the number of false positives, the false negatives and the reasons for the omissions are also discussed. Finally, the results and their application in earthquake prediction are discussed.