聊城-荣城地壳二维速度结构——初探“泰山震”之谜
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摘要
本文采用新的方法对山东省聊城-荣城深地震测深(DSS)资料作了重新解释,所获得的地壳速度结构反映出:胶东地块的速度结构比较均匀,壳内无明显的低速层;鲁西地块的速度结构极不均匀,尤其是沂沭断裂带以西,中、下地壳内有明显的低速体;沂沭断裂带北段的地壳速度结构介于上述两者之间,具有典型的过渡性特征。引人注目的济南——周村附近的壳内低速体,可能就是公元前1831年(夏帝发七年)“泰山震”的震源环境的一种反映。这不仅为探索“泰山震”之谜提供了线索,同时对济南地区的地震危险性评估提出了值得重视的问题。
By using new method, this paper presents a new interpretation on the data of deep seismicsounding of Liaocheng-Rongcheng profile in Shandong province. The results showed that the velocity structure of Jiaodong block is relatively homogeneous and there is no abvious low velocity layer in the earth crust; the velocity structure of Luxi block is very nonhomgeneous, especially along the weatern segment of the Yishu Fault Belt, an abvious low velocity layer existed in the middle and lower crust; the crustal velocity structure of northern section of the Yishu Fault Belt showed a typical transitional nature between the Jiaodong and Luxi blocks. The abvious low velocity block within the crust near Jinan-Zhoucun area may reflect the source environment of "the Taishan Earthquake" (1831 B.C. ). This not only provided an indication of the mystery Taishan Earthquake but also put forward an attention for the assessment of seismic risk in Jinan area.
By using new method, this paper presents a new interpretation on the data of deep seismicsounding of Liaocheng-Rongcheng profile in Shandong province. The results showed that the velocity structure of Jiaodong block is relatively homogeneous and there is no abvious low velocity layer in the earth crust; the velocity structure of Luxi block is very nonhomgeneous, especially along the weatern segment of the Yishu Fault Belt, an abvious low velocity layer existed in the middle and lower crust; the crustal velocity structure of northern section of the Yishu Fault Belt showed a typical transitional nature between the Jiaodong and Luxi blocks. The abvious low velocity block within the crust near Jinan-Zhoucun area may reflect the source environment of "the Taishan Earthquake" (1831 B.C. ). This not only provided an indication of the mystery Taishan Earthquake but also put forward an attention for the assessment of seismic risk in Jinan area.
引文
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高维明、郑朗荪、李家灵、林趾祥,1988,1668年郯城8． 5级地震的发震构造,中国地震,Vol.4,No.3,9-15。
黄怀勇、张碧秀、朱建亚,1989,安阳-泗水DSS剖面地壳二维速度结构,华北平原南部地区深部地球物理综合探测方法和成果,64-78,海洋出版社,北京。
卢造勋,1993,内蒙古东乌珠穆旗-辽东东沟地学剖面,地球物理学报,Vol.36,No.6,765-782。
汤永安,1989,华北平原南部地区深部地球物理综合探测方法与成果,101-111,海洋出版社,北京。
魏计春、滕吉文、孙克忠、苏宏,1990,中国山东聊城-潍坊-荣城地壳结构,中国地球物理学会年刊,78。
张碧秀、汤永安,1988,沂沭断裂带地壳结构特征,中国地震,Vol.4,No.3,16-22。
张孟昂、徐学英、陈锦泰,1995,山东省志·地震志,258,山东人民出版社,济南。
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