| 郯庐带中段第四纪断裂活动特征与地震地质条件述评 |
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| 引用本文： | 方仲景
,计凤桔
,向宏发
,丁梦麟.郯庐带中段第四纪断裂活动特征与地震地质条件述评[J].地质科学,1976,11(4):354-366. |
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| 作者姓名： | 方仲景 计凤桔 向宏发 丁梦麟 |
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| 摘 要： | 考察郯城-庐江深断裂带中段的断裂新活动情况,对开展该区地震地质、矿产勘测和水工建筑具有重要的实际意义。 三百多年前,1668年7月25日,鲁中南的临沂-郯城地区发生了8.5级强震。这样强烈的地震为什么发生在这一地带?发震的地质条件有什么特征?未来百年内有再发震的可能吗?为寻找问题的答案,近两年来我们沿郯庐带中段进行了地质考查。
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| 关 键 词： | , |
THE CHARACTERISTICS OF QUARTERNARY MOVEMENTS ALONG THE MIDDLE SEGMENT OF THE OLD TANCHENG-LUJIANG FRACTURE-ZONE AND THEIR SEISMOGEOLOGIC CONDITIONS |
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| Fang Zhongjing,Ji Fengju,Xiang Hongfa,Ding Menglin.THE CHARACTERISTICS OF QUARTERNARY MOVEMENTS ALONG THE MIDDLE SEGMENT OF THE OLD TANCHENG-LUJIANG FRACTURE-ZONE AND THEIR SEISMOGEOLOGIC CONDITIONS[J].Chinese Journal of Geology,1976,11(4):354-366. |
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| Authors: | Fang Zhongjing Ji Fengju Xiang Hongfa Ding Menglin |
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| Abstract: | The Tancheng-Lujiang deep fracture-zone is a long time developed NNE trending fracture-zone in eastern China. It occurred as a tectonic boundary between old faulted blocks as well as an important seismically active zone. The investigations of newly active fractures in the middle segment of the fracture-zone concerned here (i.e. area along central-southern Shandong and northern Jiangsu) carried out in the late two years by authors indicate that a series of large-scale overthrusting or new overriding faults discontinuously extended about 200 km occurred along the pre-existing fracture-zone since Quarternary. After Middle Pleistocene the relative fracturing amplitude of uplift and subsidence reached 20-50 m under the distinctly lateral compression force. It is, therefore, suggested that the investigated area belongs to a segment of greater velocity of crustal deformation. From the trace of the newly active fractures in the middle segment of the Tancheng-Lujiang fracture-zone the area under investigation was controlled by the regional tectonic stress field of Late Mesozoic to Cenozoic ages. For example, the Tancheng earthquake of magnitude 8.5 in 1668 occurred just in this neotectonically active area. By analyzing the seismo-geologic conditions there exists a possibility to break out strong earthquake in future. |
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