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一、全球地震活动 根据我国地震台网测定,1984年全球共发生7级以上地震13次,其中中源和深源地震4次。最大震级为7.5(表1)。按古登堡公式,地震波释放的总能量为65×10~(22)尔格。自1972年我国基本台网初步建成到1983年,全球平均每年发生7级以上地震约17次,其中浅源地震14次。1984年全球发生的7级以上地震次数和1980年相同,是13年
First, the global seismic activity According to China’s seismological network determination, in 1984 a total of seven earthquakes occurred more than 7 times, of which the source and the deep source of the earthquake 4 times. The maximum magnitude is 7.5 (Table 1). According to Gutenberg formula, the total energy released by seismic waves is 65 × 10 ~ (22) Erg. Since the foundation of our country’s basic network in Taiwan was basically completed in 1983, there are about 17 earthquakes of magnitude 7 or above every year on an average in the world, including 14 shallow earthquakes. The number of earthquakes above Seventy-seventh in the world in 1984 was the same as in 1980, 13 years