| 鄂中胡集-沙洋断裂活动性及钟祥地震发震构造 |
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| 引用本文： | 蔡永建,雷东宁,曾佐勋,乔岳强,郑水明.鄂中胡集-沙洋断裂活动性及钟祥地震发震构造[J].地球科学,2015,40(10):1607-1615. |
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| 作者姓名： | 蔡永建 雷东宁 曾佐勋 乔岳强 郑水明 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 湖北省"十一五"重点建设项目"湖北省地震背景场探测工程" |
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| 摘 要： | 为了调查该研究区的断裂活动性和发震构造, 采用现场地质、地貌调查、断层物质及阶地年龄测试等方法进行研究.调查结果显示: 胡集-沙洋断裂以正断层活动为主, 最新活动时期在第四纪早更新世晚期, 约1 136 ka.在此基础上, 进一步分析了区域构造应力场和微小地震活动与断层的关系.同时勾绘出了钟祥4次地震的有感范围, 其规模、形态与胡集-沙洋断裂的走向和活动性质基本吻合.在钟祥一带的第四纪中更新世网纹红土中, 发现疑似地震形成的破裂及喷砂喷砾现象, 表明钟祥地区在第四纪中更新世发生过M≥6.0的中强地震.基于此认识, 讨论了钟祥1407年、1469年、1603年M5.0~5.5地震的发震构造.研究表明: 该发震构造为控制汉水地堑的胡集-沙洋断裂, 也证实了在中国东部非活动断裂具有发生中强地震的构造潜力.
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| 关 键 词： | 胡集-沙洋断裂 第四纪活动性 地震 喷砂喷砾现象 发震构造 |
| 收稿时间： | 2014-12-22 |
Quaternary Activity of Huji-Shayang Fault and Seismogenic Structure Relating to Zhongxiang Earthquake |
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| Abstract: | In order to investigate the fault activity and earthquake structure of research area. Field geology, landform survey, fault gouge and terrace dating indicate Huji-shayang fault is characterized by normal faulting and the latest activity time is in late early Pleistocene of Quaternary, approximately 1 136 ka. Furthermore, we make some analysis on relation between regional tectonic stress field and micro-small earthquake activity and fault. Meanwhile, According to field earthquake destroy survey, we draw four earthquake felt area of which size and shape are consistent with strike of the fault. Moreover, we found abnormal phenomenon like fracture and sand-gravel liquefaction in middle Pleistocene reticulate red clay, which suggested a strong shock of magnitude more than 6.0 strike this area of Zhongxiang. Based on these understanding, we discuss the seismogenic structure of Zhongxiang earthquake happening in the year of 1407, 1469, 1603 of magnitude 5.0~5.5. Some conclusion that Hujia-shayang fault controlling Han river garben is possible seismogenic structure of Zhongxiang earthquake can be drawn, which confirm that non-active fault has an ability to produce moderate earthquake in east China. |
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