银川盆地地壳稳定性分析
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摘要
银川盆地地质构造复杂,地震活动频繁.为评价该区域地壳的稳定性,用重力资料解译3条北西断裂,并结合已有的构造认识,讨论深部构造样式和浅部断裂的空间展布特征及活动性,以及地震活动特征、大地形变特征及区域地球物理场特征;用模糊数学的综合评价模型将银川盆地按照77个待评区进行分区评价.结果表明,银川盆地总体处于稳定与不稳定之间;贺兰山断裂、黄河断裂附近以及盆地的中部贺兰等地区,由于断裂活动性强、构造复杂,深部构造交汇等特征,稳定性相对较差,而盆地的北部和南部稳定性则相对较好.
Yinchuan Basin is complex in geologic structure with frequent earthquake activities. To evaluate the regional crustal stability, the article interprets 3 north-west breakages with gravity data, and discusses deep structure type and superficial fracture's spatially distributing feature and activity and the seismicity feature, the ground deformation, and regional geophysical field feature based on existed structure knowledge; it divided Yinchuan Basin into 77 parts for evaluation with comprehensive assessment model of fuzzy mathematics. The result shows that, the overall Yinchuan Basin lies between stability and instability; the stability is poor in the area of Helanshan breakage, the Yellow River breakage area, and the middle part of basin-Helan area with the features of strong fault activity, complex structure, and intersection of deep structure, the north and south of the basin, however, is relatively good in stability.
Yinchuan Basin is complex in geologic structure with frequent earthquake activities. To evaluate the regional crustal stability, the article interprets 3 north-west breakages with gravity data, and discusses deep structure type and superficial fracture's spatially distributing feature and activity and the seismicity feature, the ground deformation, and regional geophysical field feature based on existed structure knowledge; it divided Yinchuan Basin into 77 parts for evaluation with comprehensive assessment model of fuzzy mathematics. The result shows that, the overall Yinchuan Basin lies between stability and instability; the stability is poor in the area of Helanshan breakage, the Yellow River breakage area, and the middle part of basin-Helan area with the features of strong fault activity, complex structure, and intersection of deep structure, the north and south of the basin, however, is relatively good in stability.
引文
[1] 王成,程建华,孟方,等.宁夏区域地质志[M].北京:地震出版社,2016.
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[3] 赵成彬,方盛明,刘保金,等.银川盆地断裂构造深地震反射探测试验研究[J].大地测量与地球动力学,2009,29(2):33-38.
[4] 杜鹏,柴炽章,廖玉华,等.贺兰山东麓断裂南段套门沟-榆树沟段全新世活动与古地震[J].地震地质,2009,31(2):256-263.
[5] 王银,孟广魁,柴炽章,等.隐伏活断层探测中的精定位技术——以银川盆地芦花台断裂为例[J].地震地质,2015,37(1):256-268.
[6] 柴炽章,孟广魁,杜鹏,等.隐伏活动断层的多层次综合探测——以银川隐伏活动断层为例[J].地震地质,2006,28(4):536-546.
[7] 雷启云,柴炽章,郑文俊,等.钻探揭示的黄河断裂北段活动性和滑动速率[J].地震地质,2014,36(2):464-477.
[8] 杨明芝,马禾青,廖玉华,等.宁夏地震活动与研究[M].北京:地震出版社,2007.
[9] 丁平,于建民,江在森.宁北地区近期垂直形变场演化特征——兼与关中地区垂直形变比较[J].地壳形变与地震,1990,10(2):99-106.
[10] 孙叶.区域地壳稳定性定量化评价[M].北京:地质出版社,1998.
[2] 酆少英.银川盆地地壳精细结构、孕震构造与隐伏活动断层浅层地震勘探[D].北京:中国地质科学院,2011.
[3] 赵成彬,方盛明,刘保金,等.银川盆地断裂构造深地震反射探测试验研究[J].大地测量与地球动力学,2009,29(2):33-38.
[4] 杜鹏,柴炽章,廖玉华,等.贺兰山东麓断裂南段套门沟-榆树沟段全新世活动与古地震[J].地震地质,2009,31(2):256-263.
[5] 王银,孟广魁,柴炽章,等.隐伏活断层探测中的精定位技术——以银川盆地芦花台断裂为例[J].地震地质,2015,37(1):256-268.
[6] 柴炽章,孟广魁,杜鹏,等.隐伏活动断层的多层次综合探测——以银川隐伏活动断层为例[J].地震地质,2006,28(4):536-546.
[7] 雷启云,柴炽章,郑文俊,等.钻探揭示的黄河断裂北段活动性和滑动速率[J].地震地质,2014,36(2):464-477.
[8] 杨明芝,马禾青,廖玉华,等.宁夏地震活动与研究[M].北京:地震出版社,2007.
[9] 丁平,于建民,江在森.宁北地区近期垂直形变场演化特征——兼与关中地区垂直形变比较[J].地壳形变与地震,1990,10(2):99-106.
[10] 孙叶.区域地壳稳定性定量化评价[M].北京:地质出版社,1998.
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