晋江——永安断裂带在泉州盆地的表现特征及其对工程建设的影响
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摘要
在前人工作的基础上研究表明,晋江-永安断裂带在泉州盆地深部切穿中、下地壳和莫霍面,影响宽度约2Km,表现为韧性变形为主的走滑断层;在浅部影响宽度约12Km,表现为一组北西向断裂,以正断层为主,兼有左旋性质,是泉州盆地控盆断裂。该组断裂上陡下缓,向深部呈铲式归并到上地壳与中地壳之间的界面上(深度11.0~11.5Km),均为第四纪早期活动断裂,更新世晚期至全新世以来不活动,未来发生破坏性地震(≥6.0级)的可能性很小,对泉州市的工程建设有一定影响,但危害性不大。
The study shows that the Jinjiang-Yongan Faulted Belt cuts through the middle and lower crusts and Moho surface on the Quanzhou Basin and has an influence on the 2-kilometer-wide area of the faulted belt,which appears as the strike-slip thrust giving priority to tenacity deformation.The faulted belt impacts on the 12-kilometer-wider area in the superficial part of the basin,which goes as a group of northwestern-trend faults that are mostly the normal faults with sinistral characters.The northwestern-trend faults are the basin-controlled faults of the Quanzhou Basin,present the steep in the upper part and slow in the lower part and wedge out the interface between the upper and middle crust with the depth of 11 to 11.5 kilometers.The faults are active in early stages of Quaternary and have been inactive from the Late Pleistocene to Holocene.In the surveyed area it is little possible to take place a destructive earthquake in the future.Therefore,the faults have some influence on and do a little harm on the engineering construction of Quanzhou municipal works.
The study shows that the Jinjiang-Yongan Faulted Belt cuts through the middle and lower crusts and Moho surface on the Quanzhou Basin and has an influence on the 2-kilometer-wide area of the faulted belt,which appears as the strike-slip thrust giving priority to tenacity deformation.The faulted belt impacts on the 12-kilometer-wider area in the superficial part of the basin,which goes as a group of northwestern-trend faults that are mostly the normal faults with sinistral characters.The northwestern-trend faults are the basin-controlled faults of the Quanzhou Basin,present the steep in the upper part and slow in the lower part and wedge out the interface between the upper and middle crust with the depth of 11 to 11.5 kilometers.The faults are active in early stages of Quaternary and have been inactive from the Late Pleistocene to Holocene.In the surveyed area it is little possible to take place a destructive earthquake in the future.Therefore,the faults have some influence on and do a little harm on the engineering construction of Quanzhou municipal works.
引文
[1]国家地震局灾害防御司,《中国历史强震目录》(公元前23世纪至公元1911年),1995。
[2]国家地震局灾害防御司,《中国近代地震目录》(公元1912年至1991年,M≥4.7),1999。
[3]廖其林,王振明,王屏路等,福州-泉州-汕头地区地壳结构的爆炸地震研究,地球物理学报,1988,33(2):163~167。
[4]丁祥焕,王耀东,叶盛基等,福建东南沿海活动断裂与地震,福建科学技术出版社,1999。
[5]马宗晋,王乾盈,徐杰等,台湾海峡两岸横向构造的对比研究,中国科学(D辑),2002,32(6):441~451。
[6]林锦华,长乐-诏安断裂带活动特征与继承性活动,华南地震,1999,19(2):57~61。
[2]国家地震局灾害防御司,《中国近代地震目录》(公元1912年至1991年,M≥4.7),1999。
[3]廖其林,王振明,王屏路等,福州-泉州-汕头地区地壳结构的爆炸地震研究,地球物理学报,1988,33(2):163~167。
[4]丁祥焕,王耀东,叶盛基等,福建东南沿海活动断裂与地震,福建科学技术出版社,1999。
[5]马宗晋,王乾盈,徐杰等,台湾海峡两岸横向构造的对比研究,中国科学(D辑),2002,32(6):441~451。
[6]林锦华,长乐-诏安断裂带活动特征与继承性活动,华南地震,1999,19(2):57~61。
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