【作者】 滕吉文； 孙克忠； 熊绍柏； 姚虹； 尹周勋； 程立芳； 薛长顺； 田东生； 郝天珧； 赖明惠； 伍明储；

【Author】 Teng Jiwen Sun Kezhong Xiong Shaobai Yao Hong Yin Zhouxun Cheng Lifang Xue Changshun Tian Dongsheng Hao Tianyao Lai Minghui Wu Mingchu (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 本文根据马鞍山、常熟两地井中组合爆炸激发的地震波,在马鞍山-常熟-启东长约300余公里的测线上,利用相遇和单支观测系统得到的记录,进行了数据处理、走时拟合和反演计算,并通过射线跟踪和理论地震图等,探讨了地壳介质的横向不均匀性,建立了该区成层地壳结构与速度分布的初步模型.研究结果表明,该区不同界面的首波和反射波具有不同的特征.根据走时的间断、跳跃,视速度变化,频谱形态与主频率分布,Q值变化与振幅特征表明,在江苏省溧阳地震活动地区,地壳内部存在着深断裂和介质疏松破碎地带.在该测线所辖地区,地壳由成层介质组成,其平均厚度为28-32 km,在该地壳中存在着低速层,向东陆缘地带地壳缓慢变薄.本文最后讨论了剖面所经溧阳地震地区的深部结构特征.更多还原

【Abstract】 The data obtained from a seismic profile extending from Maanshan,Changshu to Qidong in the East China which is about 300km in length,was processed. The result shows that the head waves and reflected waves from different interfaces in this region possess different characteristics.By use of the travel time discontinuities,apparent velocity variations,frequency spectrum forms,Q value variation and amplitude characteristics,it is shown that there is a deep fault and a loose rubbish zone within the earth’s crust in the Liyang seismic zone of Jiangsu province. The crust consists of layered medium in the region along profile and the average thickness is between about 28-32km.It is shown that the crust is getting shallower in the eastern continental fringe zone and there is a low velocity layer within the crust.The characteristics of deep structure in the Liyang seismic region along the profile are also discussed.更多还原