滇西北至滇南强震危险区地震活动能量场分析*

(1.宁夏回族自治区地震局,宁夏 银川 750001; 2青海省地震局,青海 西宁 810001)

地震能量场; 随机函数; 地震危险区; 时空分布; 滇西北; 滇南

Analysis on Energy Field of the Seismic Activity in Earthquake Hazard Area from the Northwest to the South of Yunnan
LUO Guo-fu1,TU Hong-wei2,MA He-qin1,YANG Ming-zhi1

(1. Earthquake Administration of Ningxia Hui Autonomous Region,Yinchuan 750001,Ningxia,China)(2. Earthquake Administration of Qinghai Province,Xining 810001,Qinghai,China)

seismic energy field; random function; earthquake risk zone; spatial-temporal distribution; nothwest of Yunnan; south of Yunnan

备注

运用随机函数理论,将滇西北至滇南地区的地震活动能量场看作时间和空间的随机函数,用自然正交函数展开方法,研究主要能量场的时间权重系数变化曲线、空间等值线图和研究时段内的均值能量场空间分布。结果 发现,能量场的时间权重系数变化曲线较大幅度的升、降变化异常预示了可能发生强震的时间段,而等值线图的高值变化异常对应了可能发生强震的区域。

According to the Random Function Theory,we take the seismic energy field from the northwest to the south of Yunnan as a spatial-temporal random function,and study the isogram chart of the time weight coefficient of several typical sub-fields,spatial contour,and distribution of the average energy field by the expansion of natural orthogonal function. We find that the curve's sharp rise and fall suggests the occurrence time of the strong earthquakes,while the high-value anomaly of the spatial contour suggests the risk zone of the strong earthquakes.