闽南海岸带浅层地震层序特征  

Characteristics of Min-nan offshore shallow seismic sequence

作　　者：许江[1,2] 赵绍华[1] 李海东[1] 胡毅[1] 毛建利[1] 房旭东[1] 

机构地区：[1]国家海洋局第三海洋研究所,厦门361005 [2]中国地质大学地球物理与空间信息学院,武汉4300743

出　　处：《地球物理学进展》2011年第2期498-504,共7页Progress in Geophysics

基　　金：国家海洋局908-ZC-105;908-01-QC21资助

摘　　要：闽南海岸带类型多样、岸线曲折,近岸海域资源丰富,历史上曾对该地区作过一些工程环境调查研究,受当时技术条件的限制,探测精度、分辨率,已不能满足近海工程建设的需要.本文主要采用海底浅层剖面仪进行探测,根据上下地震层序之间的接触关系特征,将研究区内浅部地震反射界面主要分为T_0、T_1和T_2三个区域性地震反射界面,其间还断续发育R_1和R_2两个局部性反射界面.根据T_0、T_1和T_2三个区域性地震反射界面特征,划分出U_a、U_b和U_c三个主要地震层序,根据R_1、R_2的反射界面特征,可将U_、aU_b分别划分为U_a^2、U_a^2和U_b^1、U_b^2四个亚地震层序.结合地质历史资料对比分析,简要阐述了研究区全新世以来的地质演化过程.On Mimnan coastal zone, shoreline is zigzag and its types are diverse, coastal waters is rich in natural resources. In history, some engineering and environmental research have been carried on these areas, however, due to the limits of former technical conditions, the accuracy and resolution of exploration can not meet the needs of offshore engineering construction. In this paper, using sub-bottom profiler, shallow stratigraphic sequence of Min-nan coastal zone is surveyed. According to the characteristics of contact relationship between the upper and lower seismic sequences, the whole shallow seismic reflecting layer can be divided into 3 different regional reflecting boundaries, which marked as：T0, T1 , T2. Besides, among them there are 2 partial reflecting boundaries： R1 , R2 developed off and on. Based on the characteristics of 3 regional reflecting boundaries： T0, T1, T2, the whole shallow seismic sequence can be divided into 3 major seismic sequences： Ua, Ub, Uc. According to the characteristics of R1, R2 reflecting boundaries, seismic sequences U~, U, can be separately divided into 4 sub seismic sequences： Ua^1 , Ua^2 , Ub ^- and Ub^2. At last, through comparative analysis of historical geological data, the geological evolution in the study area is briefly discussed since the Holocene.

关 键 词：闽南海岸带 浅层地震 地震层序特征 

分 类 号：P315[天文地球—地震学]