| 1932年昌马7.5级地震形变带及其构造背景的初步分析 |
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| 引用本文： | 周俊喜,张生源.1932年昌马7.5级地震形变带及其构造背景的初步分析[J].西北地震学报,1981,3(1):92-100. |
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| 作者姓名： | 周俊喜 张生源 |
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| 作者单位： | 甘肃省地震局兰州地震研究所
(周俊喜)，甘肃省地震局兰州地震研究所(张生源) |
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| 摘 要： | 昌马1932年12月25日7.5级地震主要是昌马—俄博断裂带西段现今强烈活动的结果。该带的垂直差异运动西段此东段更为明显。第四纪以来,该带的活动通常是以北北西、北西西向两组扭裂面方式表现出来的。地震形变带就沿其展布,北北西向形变带显示顺时针扭动,北西西向形变带为反时针扭动,与发震断裂的两组扭裂面不仅方向吻合,而且扭动方向一致。平面上形成一系列的反“S”状构造,从而认为这种单体非反“S”状,而总体排列为反“S”状的构造是祁只系西翼挽近和现今活动的地质标志之一。根据地震形变带的分析,地震时震区的平均主压应力方向为北30～40°东,与土体应力解除所得平均主压应力方向北33°东相一致。运用地质类比法,认为民乐地区有同昌马地震相似的构造条件和岩性条件,所以有发生中强地震的可能。
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| 收稿时间： | 1980/2/1 0:00:00 |
PRELIMINARY ANALYSIS OF THE EARTHQUAKE'S DEFORMATION ZONES AND STRUCTURAL BACKDROP IN THE 1932 CHANG MA EARTHQUAKE (M=7.5) |
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| Zhou Junxi and Zhang Shengyuan.PRELIMINARY ANALYSIS OF THE EARTHQUAKE''S DEFORMATION ZONES AND STRUCTURAL BACKDROP IN THE 1932 CHANG MA EARTHQUAKE (M=7.5)[J].Northwestern Seismological Journal,1981,3(1):92-100. |
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| Authors: | Zhou Junxi and Zhang Shengyuan |
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| Institution: | Seismologicai Institute of Lanzhou and Seismologicai Institute of Lanzhou |
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| Abstract: | The Chang Ma earthguake (M=7.5) Qccurred on December 25th, 1932 was the conseguence of the then strong movement in western Chang Ma-EBo fault zone. In this zone, the movement of the vertical displacement was more evident in its western sector than the eastern one. Since the Quaternary, the movement had shown in the way of two planes of shear fracture of the north-north west and north-west west.The earthguake''s deformation zohe expended in the direction of the planes of shear fracture. It appeared in the shape of reversed S on the plane. The north north-west deformation zone indicated a clockwise twist, while the north-west west deformation an anti-clockwise twist. This not only coinsides with the direction of the plane of shear fracture, but also conforms in the direction of twist, compared, with the two planes of shear fracture of the earthquake fault. In Gansu Corridor, when the total structure became the shape of reversed S, while the individual was not, it was one of the geological marks of the western Qi-Lü epsilon structural system that moved recently and at present.According to the differentiation in the earthquake deformation zono at the time of the earthquake the direction of the principal compression stress was north 30°-40° east, it was similar to north 33° east, obtained by stress relief method.Based on the geological analogical method, it is believed that since the Min Le area and Chang Ma area have similar Comditions in structure and rock, there exists the possibility of middle-strong earthquake. |
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