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1987年2月17日11时3分27秒,江苏省射阳县(北纬33°55′,东经120°32′)发生了M_s5.1地震,震源深度约18km。根据图1,该地震序列似应为前—主—余震型。但该序列中最大前震震级为M_s2.4,最大余震震级为M_s1.8,分别和主震震级相差2.7级和3.3级,主震释放能量占全序列释放总能量的99.99％。因此,我们主张称其为“接近孤立型的前—主—余震型序列。 从2月6日至2月17日主震发生前,位于震中区西南约35km处的大丰深井地震仪
At 11:03:27 on February 17, 1987, the M_s5.1 earthquake occurred in Sheyang County, Jiangsu Province (latitude 33 ° 55 ’, longitude 120 ° 32’ East) with a focal depth of about 18 km. According to Figure 1, the earthquake sequence should be pre-primary-aftershock-type. However, the maximum foreshock magnitudes of this series are M_s2.4 and the maximum aftershock magnitudes are M_s1.8, which differ by 2.7 and 3.3 respectively from the mainshock magnitudes. The main shock releases 99.99% of the total energy released from the whole series. Therefore, we advocate it as a “near-isolated type of pre-host-aftershock-type sequence.” Before February 6 to February 17 before the main shock, the Dafeng deep well seismograph located about 35 km southwest of the epicenter area