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广东省海丰县西南约15公里的梅陇镇,自1971年建台至1980年底,共记录当地地震800余次。1981年的小震活动更加频繁,仅2至4月,记录小震达1500余次,且有逐步升级之势。2月28日发生2.8级(Ms)地震。3月14日发生2.9级(Ms)地震,4月9日又发生3.9级(Ms)地震,这是梅陇地区近十年来最大的一次地震,震中在梅陇东南的坡平附近,周围几个公社明显有感,地震有声,个别房屋掉瓦,旧墙裂缝扩大。梅陇震群的震级虽小,但地震连续发生,持续时间较长,究竟原因何在?本文就其构造背景作一简要分析。
Meilong Town, about 15 km southwest of Haifeng County, Guangdong Province, has been building more than 800 earthquakes since its establishment in 1971 to the end of 1980. The activities of minor earthquakes in 1981 were more frequent. From February to April alone, more than 1,500 minor earthquakes were recorded and there was a gradual escalation. An earthquake of magnitude 2.8 (Ms) occurred on February 28. An Ms (Ms) earthquake occurred on March 14 and an Ms (Ms) earthquake occurred on April 9. This is the largest earthquake in Meilong area in recent ten years. The epicenter was around Pingping, southeast of Meilong, and several The commune clearly felt that there was a sound of earthquakes, that individual houses dropped tiles and the cracks in the old walls widened. Although the magnitude of the Meilong earthquake swarm is small, the earthquakes occur continuously and last longer. What exactly is the reason? This paper gives a brief analysis of its tectonic setting.