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菏泽地区是一个“重复地震区”。1937年8月1日发生7.0级地震和6(3/4)级地震,1948年5月发生了5.5级地震,1983年11月7日又发生了5.9级地震。这四次地震震中位置相互之间的距离均在10公里左右。对这样一个“重复地震区”的地壳厚度和地震波传播速度的研究很有必要。本文利用距菏泽震区100公里左右的梁山、嘉祥两个地震台站记录到的反射波震相和其它台站记录到的某些震相,得到本区地壳厚度和地震波的传播速度。
Heze area is a “repetitive earthquake area.” An earthquake of magnitude 7.0 and magnitude 6 (3/4) occurred on August 1, 1937, a magnitude 5.5 earthquake occurred in May 1948 and a magnitude 5.9 earthquake occurred on November 7, 1983. The epicenter of these four earthquakes are at a distance of about 10 kilometers from each other. It is necessary to study the crustal thickness and seismic wave propagation speed in such a “repeated seismic zone”. In this paper, we use the reflected seismic phases recorded by Liangshan and Jiaxiang seismic stations about 100 km away from Heze earthquake zone and some seismic phases recorded by other stations to obtain the crustal thickness and seismic wave propagation velocity in this area.