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辽西兴城地区深反射地震剖面初步研究

DOI: 10.6038/cjg20140910, PP. 2833-2845

Keywords: 辽西,地震,反射,莫霍

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Abstract:

为了分析和研究辽西兴城地区深部地下结构,深部探测与实验研究专项SinoProbe在辽西进行了深反射地震实验研究.本文报告了在辽西东部进行的一次二维近垂直深反射地震实验结果,测线西起葫芦岛市西老爷庙村,东至兴城市区外首山附近的郭家店,方向约为北偏西33°,剖面全长21.93km.在共中心点叠加剖面发现了5个主要反射波组,分别出现在双程走时6s,6.5s,7.5s,8s,10.4s左右.论文对主要反射波组地球物理特征进行了描述、分析,并结合邻区深部地震资料研究成果,得出三点认识:一是研究区域地壳可分为上、下两层结构,上地壳内无明显反射层位,下地壳呈现“凹陷”特征;二是观测到来自莫霍面反射信号(10.4sTWT),对应莫霍面深度约为30km左右(速度按地壳平均速度6km/s折算),莫霍面西深东浅,东部较西部约抬升600m;三是本区域莫霍面可能由一组横向速度、厚度不一致的多个薄层构成.

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