1999年吉林汪清Ms7.0深源地震速报的探讨

Study on the rapid report of 1999 Wangqing, Jilin, deep focus earthquake with Ms7.0

1999年 4月 8日 2 1时 10分 35秒 (北京时间 )在吉林省汪清县 (震中位于北纬 4 3 4° ,东经 130 3°)发生了Ms7 0级地震。此次地震是自成都遥测地震台网建网以来首次记录到的中国大陆深源地震 ,震源深度达 578km ,深震震相清淅可靠。本文给出了这些深震震相的图例 ,并对由深震震相修定计算机初定的震源深度和震中位置 ,给出了一种查表作图和简便计算的方法 ,这对《四川地震台站典型震相图集》[1] 是一个补充 ,对在地震速报中正确识别震相和准确定位具有实际的参考作用。

The M s7 0 Wangqing Earthquake ( longitude 130.3°E, latitude 43.4°N)occurred at 21h10m35sec (Beijing time) on 8 April 1999. This is the first observed record of the deep focus earthquake appeared in Chinese continent since Chengdu Telemetric Seismic Network began running. The focal depth of this earthquake is 578 kilometers and the deep focus phases are very clear. The deep phase record figures have been shown. A method for improving the primary calculating results of focal depth and epicenter location by using deep focus phases through the travel time tables, plotting and simple computation have been given in this paper. It is the supplement for the 《Typical earthquake phase examples on Sichuan Earthquake Network》 and may be played an actual reference part for correctly identifying the deep phases and determining the focal location on our earthquake rapid report.