| 海原活动断裂带破裂行为特征研究 |
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| 引用本文： | 闵伟,张培震等. 海原活动断裂带破裂行为特征研究[J]. 地质论评, 2001, 47(1): 75-81 |
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| 作者姓名： | 闵伟 张培震等 |
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| 作者单位： | 中国地震局地质研究所,北京,100029;中国地震局地质研究所,北京,100029;中国地震局地质研究所,北京,100029;中国地震局地质研究所,北京,100029 |
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| 基金项目： | 国家自然科学杰出青年基金(编号49825104),地震科学联合基金(编号9507421) |
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| 摘 要： | 通过对海原断裂带18个探槽资料的研究,分析得出海原断裂带是10ka以来共发生10次古地震事件,这些古地震事件具有分级破裂的特征,第一次和最后一次是沿全断裂的破裂事件,其他都是沿次级段落的破裂事件。在时间上,古地震事件的分布是不均匀的,具有丛集的特征;在空间上,具有西段或中东段（中段）来回迁移的特征。沿全断裂的破裂事件震级约8．5级左右,沿次级断裂的破裂事件震级约7．5级左右。
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| 关 键 词： | 断裂 古地震 丛集 |
Detailed Study of Holocene Paleoearthquakes of the Haiyuan Active Fault |
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| MIN Wei,ZHANG Peizhen,DENG Qidong,MAO Fengying China Seismological Bureau. Detailed Study of Holocene Paleoearthquakes of the Haiyuan Active Fault[J]. Geological Review, 2001, 47(1): 75-81 |
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| Authors: | MIN Wei ZHANG Peizhen DENG Qidong MAO Fengying China Seismological Bureau |
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| Affiliation: | MIN Wei,ZHANG Peizhen,DENG Qidong,MAO Fengying China Seismological Bureau,Institute of Geology,Beijing |
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| Abstract: | Through studying eighteen trenches along the Haiyuan fault, ten paleoearthquakes were determined since ten thousand years ago. They have different rupture scales. The first and last events ruptured along the entire fault; the other events ruptured along secondary segments. The paleoevents are characterized by clustering in time and migrated back and forth from the west segment to middle - east segment. The magnitude of earthquakes along the entire ruptured fault is about 8. 5 and of those along the secondary ruptured segments is about 7.5. |
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| Keywords: | fault paleoearthquake cluster |
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