地震研究

在建立了银川盆地活动断裂和地震资料数据库的基础上,利用缓冲区分析、叠加分析和统计分析等方法,进行GIS支持下的地震与活动断裂关系的研究,探明了以20 km为半径的缓冲区内包含了约95%的地震,区内的近代地震主要沿全新世活动断裂分布,正断裂的单位地震数较高,在断裂交汇区地震分布较集中。研究结果表明,GIS技术是地震与活动断裂关系研究的有效手段。

Basing on the establishing active faults and database of seismic data in Yinchuan basin,we studied the relationship between the earthquakes and active faults by using GIS methods of buffer analysis,overlay analysis and statistical analysis etc.. We found that 95% of the earthquakes occurred in the buffer with the radius of 20 km,and the modern earthquakes were mainly distributed along the Holocene active faults in the study area. The number of units of the earthquake was higher in the normal faults,and the distribution of the earthquakes concentrated in fracture intersection area. The results demonstrate that the GIS technology is an effective mean to study the relationship between earthquakes and active faults.

引言
1 研究区活动断裂与地震分布概况
2 断裂缓冲区的创立
3 地震与断裂的叠加分析
4 结论与讨论

表1 研究区主要断裂及其活动性<br/>Tab.1 The main faults and their activeties in the study area

表1 研究区主要断裂及其活动性
Tab.1 The main faults and their activeties in the study area

图1 研究区断裂分布图<br/>Fig.1 Distribution of active faults in the study area

图1 研究区断裂分布图
Fig.1 Distribution of active faults in the study area

图2 研究区地震分布图<br/>Fig.2 Distribution of earthquakes in the study area

图2 研究区地震分布图
Fig.2 Distribution of earthquakes in the study area

图3 地震震中距最邻近断裂的距离分布频率直方图<br/>Fig.3 Distance distribution histogram of the distance of epicenter from the closest fault

图3 地震震中距最邻近断裂的距离分布频率直方图
Fig.3 Distance distribution histogram of the distance of epicenter from the closest fault

表2 不同断裂时代地震数目分布<br/>Tab.2 Distribution of earthquake number on the active fault in different age

表2 不同断裂时代地震数目分布
Tab.2 Distribution of earthquake number on the active fault in different age

图4 半径10 km(a)和20 km(b)缓冲区单位长度地震数目分类渲染图<br/>Fig.4 Rendering of earthquake number classification per unite length in buffer of radio 10 km(a)and 20 km(b)

图4 半径10 km(a)和20 km(b)缓冲区单位长度地震数目分类渲染图
Fig.4 Rendering of earthquake number classification per unite length in buffer of radio 10 km(a)and 20 km(b)

表3 不同性质断裂的地震数目分布<br/>Tab.3 Distribution of earthquake numbers on the different active fault

表3 不同性质断裂的地震数目分布
Tab.3 Distribution of earthquake numbers on the different active fault

图5 不同性质断裂地震分布图<br/>Fig.5 Distribution of earthquakes on different active fault

图5 不同性质断裂地震分布图
Fig.5 Distribution of earthquakes on different active fault

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备注

引言

1 研究区活动断裂与地震分布概况

2 断裂缓冲区的创立

3 地震与断裂的叠加分析

4 结论与讨论

期刊信息