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1918年2月13日14时07分在广东南澳东北侧海中发生的7.3级地震,是本世纪我国东南诸省(台湾除外)的最大地震,波及粤、闽、赣、浙、台、苏、沪、皖、鄂、湘、桂等省市自治区,震中烈度十度,造成相当大的破坏和伤亡。重新查阅上海保存的地震记录,发现在次日04时25分又发生一次7.0级地震和一系列小于6级的余震。两次大震的震级相近,所释放的能量占整个地震序列总能量的99.4%。因此,这次地震属双震型。利用丰富的宏观资料绘制了该次地震的等震线图,求得了该次地震的震源机制解,判定该次地震是由于泉州——汕头断裂带左旋走向滑动的结果。
The magnitude 7.3 earthquake that hit the northeastern coast of Nanao in Guangdong Province at 14:07 on February 13, 1918 was the largest earthquake of all southeastern provinces in China this year (except Taiwan), affecting most of Guangdong, Fujian, Jiangxi, Zhejiang, Taiwan, the Soviet Union, Shanghai, Anhui, Hubei, Hunan, Guangxi and other provinces and municipalities, the intensity of ten degrees epicenter, causing considerable damage and casualties. Revisiting the records of the earthquakes preserved in Shanghai, it was found that another 7.0 magnitude earthquake and a series of aftershocks less than magnitude 6 occurred on the next day at 0425. The magnitudes of the two major earthquakes are similar, and the released energy accounts for 99.4% of the total energy of the entire earthquake sequence. Therefore, the earthquake is double shock type. Using the macroscopic data, the isoseismic map of the earthquake was plotted, and the focal mechanism solution of the earthquake was obtained. It is concluded that the earthquake was due to the left-lateral slip of Quanzhou-Shantou fault.