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海原断裂高湾子地点三维探槽的开挖与古地震研究
引用本文:冉勇康,焦德成.海原断裂高湾子地点三维探槽的开挖与古地震研究[J].地震地质,1997,19(2):2-107.
作者姓名:冉勇康  焦德成
作者单位:[1]国家地震局地质研究所 [2]宁夏回族自治区地震局
摘    要:对海原断裂高湾子地点进行大比例尺地质地貌填图和三维探槽开挖,揭示出7次古地震事件,除1920年地震外,它们的年龄分别为距今(10004±3196),(6689±169),(6120±505),(4208±577),(2763±372)和(1005±465)a;重复间隔分别为(3315±3200),(561±532),(1920±766),(1425±686),(1578±595)和(980±465)a。事件Ⅲ,Ⅳ,Ⅴ,Ⅵ,Ⅶ的水平位移量分别为(5.6±2.3),(1.5±1.1),(1.5±1.1),(2±1)和(7±0.5)m。显示出重复间隔时间的分段性和特征行为的分级性。两次类似1920年强度的地震间隔期间,有3次位移量为1~2m的地震发生

关 键 词:古地震  地震复发间隔  断层位移  海原断裂  三维探槽

3 D TRENCH EXCAVATION AND PALEOSEISMOLOGY AT GAOWANZI OF THE HAIYUAN FAULT
Ran Yongkang,Duan Ruitao,Deng Qidong.3 D TRENCH EXCAVATION AND PALEOSEISMOLOGY AT GAOWANZI OF THE HAIYUAN FAULT[J].Seismology and Geology,1997,19(2):2-107.
Authors:Ran Yongkang  Duan Ruitao  Deng Qidong
Abstract:The 240km long Haiyuan fracture zone is a typical active fault in the inland of China. The 1920 Haiyuan earthquake ( M S 8.6) has made the whole fault offset sinistrally. Our recent research on the large scale geological geomorphological mapping and 3 D trench excavation at Gaowanzi, Haiyuan fault has revealed that at least 7 paleoearthquakes have been occurred since Holocene. And we have also studied the time intensity distribution of these events. Except the earthquake of 1920, these events have t
Keywords:Paleoearthquake  Recurrence interval  Fault displacement  Haiyuan fault      3  D trench  
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