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６２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.
出处
《中国地震》
CSCD
北大核心
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
关键词
地壳上地幔
速度结构
深断裂
地震区
壳幔构造
Zhangbei and its adjacent area\ Crust and upper mantle velocity structures\ Deep
crust fault\ wide angle reflection and refraction
