地震研究

滇西北至滇南强震危险区地震活动能量场分析^*

罗国富¹,屠泓为²,马禾青¹,杨明芝¹

(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)

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)

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

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参考文献

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.

引言
1 研究方法
2 数据处理和分析
3 结论和讨论

表1 前6个主要能量场的特征值<br/>Tab.1 First 6 eigenvalues of the main energy field

表1 前6个主要能量场的特征值
Tab.1 First 6 eigenvalues of the main energy field

图1 前6个主要能量场的时间权重系数曲线<br/>(a)第1个能量场占总能量场的25.1%;(b)第2个能量场占总能量场的21.38%;(c)第3个能量场占<br/>总能量场的19.5%;(d)第4个能量场占总能量场的17.12%;(e)第5个能量场占总能量场的9.55%; <br/>(f)第6个能量场占总能量场的2.33%(细实线是曲线变化的基准线,过纵坐标0点)<br/>Fig.1 The time weight coefficient curve in the front of six main energy fields(a)Time factor accounting for 25.1% of the total energy field;(b)Time factor accounting for 21.38% of the total energy field; (c)Time factor accounting for 19.5% of the total energy field;(d)Time factor accounting for 17.12% of the total energy field; (e)Time factor accounting for 9.55% of the total energy field;(f)Time factor accounting for 2.33% of the total energy field

图1 前6个主要能量场的时间权重系数曲线
(a)第1个能量场占总能量场的25.1%;(b)第2个能量场占总能量场的21.38%;(c)第3个能量场占
总能量场的19.5%;(d)第4个能量场占总能量场的17.12%;(e)第5个能量场占总能量场的9.55%;
(f)第6个能量场占总能量场的2.33%(细实线是曲线变化的基准线,过纵坐标0点)
Fig.1 The time weight coefficient curve in the front of six main energy fields(a)Time factor accounting for 25.1% of the total energy field;(b)Time factor accounting for 21.38% of the total energy field; (c)Time factor accounting for 19.5% of the total energy field;(d)Time factor accounting for 17.12% of the total energy field; (e)Time factor accounting for 9.55% of the total energy field;(f)Time factor accounting for 2.33% of the total energy field

图2 研究区域构造与中强地震分布图<br/>Fig.2 Distribution map of the moderate-strong earthquake and tectonics in the research area

图2 研究区域构造与中强地震分布图
Fig.2 Distribution map of the moderate-strong earthquake and tectonics in the research area

图3 前6个主要能量场的等值线图(图中色标数字为能量(单位:×105 J))<br/>(a)第1个能量场占总能量场的25.1%;(b)第2个能量场占总能量场的21.38%;(c)第3个能量场<br/>占总能量场的19.5%;(d)第4个能量场占总能量场的17.12%;(e)第5个能量场<br/>占总能量场的9.55%;(f)第6个能量场占总能量场的2.33%<br/>Fig.3 The isograms in the first 6 main energy fields(colour code in the figure indicates energy(×105 J))(a)Isograms in the first main energy field accounting for 25.1% of those in the total energy fields;(b)Isograms in the first main energy field accounting for 21.38% of those in the total energy fields;(c)Isograms in the first main energy field accounting for 19.5% of those in the total energy fields;(d)Isograms in the first main energy field accounting for 17.12% of those in the total energy fields;(e)Isograms in the first main energy field accounting for 9.55% of those in the total energy fields;(f)Isograms in the first main energy field accounting for 2.33% of those in the total energy fields

图3 前6个主要能量场的等值线图(图中色标数字为能量(单位:×105 J))
(a)第1个能量场占总能量场的25.1%;(b)第2个能量场占总能量场的21.38%;(c)第3个能量场
占总能量场的19.5%;(d)第4个能量场占总能量场的17.12%;(e)第5个能量场
占总能量场的9.55%;(f)第6个能量场占总能量场的2.33%
Fig.3 The isograms in the first 6 main energy fields(colour code in the figure indicates energy(×105 J))(a)Isograms in the first main energy field accounting for 25.1% of those in the total energy fields;(b)Isograms in the first main energy field accounting for 21.38% of those in the total energy fields;(c)Isograms in the first main energy field accounting for 19.5% of those in the total energy fields;(d)Isograms in the first main energy field accounting for 17.12% of those in the total energy fields;(e)Isograms in the first main energy field accounting for 9.55% of those in the total energy fields;(f)Isograms in the first main energy field accounting for 2.33% of those in the total energy fields