1993年7—9月的全球地震动态

１９９３年第三季度，全球地震活动水平为中等偏高，明显高于上半年平均水平。日本北海道西南近海发生７．６级浅源地震，但不属于日本海沟地震。埃及西奈半岛发生５．７级地震，为今年亚欧带西段之最大地震。马里亚纳群岛发生８．１级中深震，使西北太平洋地区地震水平达到全球第一。兴都库什地区接连发生三次较大中深震，可能对我国西部地区地震活动有影响。墨西哥恰帕斯州近海发生７．３级地震，美洲带新的地震活动轮回正式开始。印度南部发生６．３级中强震，属于板内地震。

DEVELOPMENTS IN GLOBAL SEISMICITY FOR JULY-SEPTEMBER 1993

The global seismicity during the 3rd quarter of the year 1993 was of medium level or slightlyhigher,and was distinctly higher than the average seismicity level of the first half of the year.Ashallow earthquake with M 7.6 struck off the southwest coast of Hokkaido,Japan,but it was notaJapan Trench earthquake. An earthquake of magnitude 5.7 occurred in Shinai Penisula, Egyptand it has been the biggest earthquake occurring on western part of the Eurasian belt this year.An earthquake of intermediate depth registering magnitude 8.1 occurred in the Mariana Islands,and so this made the seismicity level in northwest Pacific Ocean region the first of the globe.Three major earthquakes of intermediate depth successively occurred in Hindu Kush region andthis may effect the seismicity in the northwest region of China. An earthquake of magnitude 7.3occurred off the state Chiapas,Mexico and a new cycle of seismicity has already begun along theAmerican seismic belt.A medium strong intraplate earthquake of M 6.3 occurred in South lndia.