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1605年琼山地震是数百年来海南岛北部及其邻区发生过的最强烈的一次地震。据广东地震局丁原章等的最新研究结果,这次地震的宏观震中在东寨港附近(东经110.5°,北纬20.0°),震中烈度为十度,震级为7 1/2级;史料明确记载发震时间是明万历三十三年五月二十八日夜亥时。近一、两年来,广东省地震局重新收集、整理、订正了这次地震的有关史料,写出了一本丰富的史料汇编。本文正是以这些史料中的房屋破坏资料为基础,用正态模糊集贴近度方法,对这次大地震的六度以上烈度区进行了模糊评定。这是我们单独采用模糊数学方法来近似划定历史大地震的烈度分区的第一次尝试。
The 1605 Qiongshan Earthquake was the most intense earthquake that occurred in the northern part of Hainan Island and its neighboring areas for hundreds of years. According to the latest research results by Ding Sezhang of the Seismological Bureau of Guangdong Province, the epicenter of this earthquake was in the vicinity of Dongzhaigang (110.5 ° longitude and 20.0 ° north latitude) with a moderate intensity of ten degrees and a magnitude of 7 1/2; The time of the earthquake was Ming Wanli thirty-three years May 28 at midnight. In the past one or two years, the Seismological Bureau of Guangdong Province has re-collected, sorted out and corrected the relevant historical data of the earthquake and wrote a rich compilation of historical materials. Based on the data of house destruction in these historical materials, this paper uses the approach of normal fuzzy set approach to make a fuzzy assessment of the intensity above six degrees of the earthquake. This is the first attempt of us to use fuzzy mathematics alone to approximate the intensity subdivision of a historic earthquake.