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我们选取了南京地震台763地震仪记录的极远震,利用其中 PP 震相的初动位移测定方位角和震中位置。一、测定情况单台测定极远震震中比较困难,是因为极远震记录的初至震相 PKP 的视出射角大于80°,其水平分量很微弱,自然也就无法用 PKP 的水平位移来测定方位角。1982年6月7日在墨西哥连续发生了两次七级以上大地震,我台首次使用 PP 震相的初动位移测定方位角,
We selected the far-flung earthquake recorded by Nanjing Seismostation 763 seismograph, and used the initial displacement of PP seismic phase to measure the azimuth and epicenter. First, the determination of a single determination of the far earthquake epicenter more difficult because of the first earthquake recorded extreme polar phase PKP apparent angle greater than 80 °, the horizontal component is very weak, it is impossible to use the horizontal displacement of PKP Determination of azimuth. June 7, 1982 in Mexico, two successive earthquakes of magnitude seven or more occurred. For the first time, Taiwan used the initial displacement of PP seismic phase to measure azimuth,