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本文运用可公度计算和蝴蝶结构图对斐济地区1962年以来MS≥7.1地震时空对称性及其趋势进行分析,结果显示:2015、2016年斐济地区发生MS≥7.1地震的信号较强,其中2015年的信号强于2016年.通过震中迁移分析,发现其空间迁移经纬向具有一定的同步性和对称性;纬向迁移对称轴在21°S左右,经向迁移对称轴在180°左右.未来空间迁移可能向东北方向迁移,其对称轴呈西北—东南走向.正常年份和厄尔尼诺年份研究区域多发地震,拉尼娜时期地震发生少.该研究对完善重大自然灾害时空对称性理论研究具有参考意义.
In this paper, we analyze the spatiotemporal symmetry and its trend of MS≥7.1 earthquakes in Fiji since 1962 using the method of commensurate computation and butterfly structure. The results show that there is a strong signal of MS≥7.1 earthquakes in Fiji area in 2015 and 2016, with 2015 The signal of the year is stronger than that of 2016. According to the analysis of the epicenter migration, the latitudinal and longitudinal latitudinal directions of the spatial migration are found to be synchronous and symmetrical; the symmetry axis of the latitudinal migration is about 21 ° S and the symmetry axis of the meridional migration is about 180 °. The spatial migration may migrate to the northeast and its axis of symmetry is from northwest to southeast. In normal years and El Niño, there are many earthquakes in the study area and few earthquakes occur during the La Niña period.This study has reference significance for the study of the theory of spatiotemporal symmetry of major natural disasters.