张北—尚义地震区的壳幔构造  

750EhrlichG,J,CheThe Crust mantle Structure in Zhangbei Shangyi Earthquake Area

作　　者：祝治平[1] 张建狮[1] 张先康[1] 张成科[1] 刘明清[1] 聂文英[1] 

机构地区：[1]中国地震局地球物理勘探中心

出　　处：《中国地震》1999年第1期65-73,共9页Earthquake Research in China

基　　金：国家科委"八五"科技重点项目;地震科学联合基金

摘　　要：通过对河北张家口地区的深地震测深宽角反射／折射剖面资料的研究表明：近东西向的张北—崇礼地壳断裂带与北西西向的张家口—渤海地壳深断裂带在张北６２级地震区交汇。在这里延伸至莫霍面的地壳深断裂带和壳内界面的不连续处是汉诺坝大面积玄武岩溢出的通道。震区中上地壳内的局部速度逆转和下地壳内异常的低速带预示着岩浆活动仍较强烈。The seismic data obtained from the wide angle reflection and refraction profile passing through Zhangjiakou area in Hebei Province was interpreted.The results show as follows:the Zhangbei deep crust fault zone is nearly EW trending and the Zhangjiakou Bohai Sea deep crust fault zone is NWW trending that meet in Zhangbei earthquake ( M s=6.2) area where both the deep crust fault zones stretching to Moho and the interior crust discontinuity interfaces from the eruptive pathes for Hannuoba basalt in a large area.The local velocity inversion of middle and upper crust in earthquake area as well as the low velocity anomaly in lower crust imply that magmatic activities are still violent.The recent activities of Zhangjiakou Bohai Sea deep crust fault zone may be the main factors which cause the Zhangbei earthquake.

关 键 词：地壳上地幔 速度结构 深断裂 地震区 壳幔构造 

分 类 号：P315.2[天文地球—地震学] P183.2[天文地球—固体地球物理学]