LATE QUATERNARY PALEOEARTHQUAKES AND THEIR RUPTURE FEATURES ALONG THE LINGWU FAULT

SEISMOLOGY AND GEOLOGY ›› 2001, Vol. 23 ›› Issue (1): 15-23.

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LATE QUATERNARY PALEOEARTHQUAKES AND THEIR RUPTURE FEATURES ALONG THE LINGWU FAULT

Chai Chizhang¹, Liao Yuhua¹, Zhang Wenxiao¹, Xu Wenjun¹, Shen Xuhui², Tian Qinjian²

Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan 750001

Received:2000-05-31 Revised:2000-07-31 Online:2001-03-07 Published:2009-10-26

灵武断裂晚第四纪古地震及其破裂特征

柴炽章¹, 廖玉华¹, 张文孝¹, 许文俊¹, 申旭辉², 田勤俭²

1. 宁夏回族自治区地震局, 银川 750001;
2. 中国地震局分析预报中心, 北京 100036

基金资助:
国家自然科学基金(49732090)、地震科学联合基金(197013)和宁夏回族自治区科技攻关计划项目(26)共同资助.

Abstract

Abstract: Based on geological and geomorphic investigation, the paleoearthquake events along the Lingwu faults have been revealed by digging trenches. The results show that there are five faulting events along the Lingwu faults since 28ka B.P. and they happened in about (27.15±0.778)ka、20.0ka,(13.07±0.06)ka,(10.586±0.05)ka and 6.0ka B.P., respectively. According to synthetic comparison and analyses on the five paleoearthquakes events,it is suggested that the fault has the segmented and combined rupture features. And we have estimated their magnitudes by combining the rupture lengths and the coseismic displacement revealed by the trenches.

Key words: Lingwu fault, Paleoearthquake, Combining rupture, Yinchuan Basin

摘要： 在地质地貌调查基础上,对灵武断裂进行了古地震槽探揭露。结果显示,距今28ka以来,灵武断裂上发生过5期地表破裂型地震事件,时间大约分别在距今(27.15±0.778),20.0,(13.07±0.06),(10.586±0.05)和6.0ka。根据5期古地震事件的综合对比分析,发现断裂有分段组合破裂的特征,由此并结合槽探揭示的古地震同震位移等估计了古地震的震级。

关键词: 灵武断裂, 古地震, 组合破裂, 银川盆地

Chai Chizhang, Liao Yuhua, Zhang Wenxiao, Xu Wenjun, Shen Xuhui, Tian Qinjian. LATE QUATERNARY PALEOEARTHQUAKES AND THEIR RUPTURE FEATURES ALONG THE LINGWU FAULT[J]. SEISMOLOGY AND GEOLOGY, 2001, 23(1): 15-23.

柴炽章, 廖玉华, 张文孝, 许文俊, 申旭辉, 田勤俭. 灵武断裂晚第四纪古地震及其破裂特征[J]. 地震地质, 2001, 23(1): 15-23.

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LATE QUATERNARY PALEOEARTHQUAKES AND THEIR RUPTURE FEATURES ALONG THE LINGWU FAULT

灵武断裂晚第四纪古地震及其破裂特征

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