【摘要】 为了进一步研究唐山地区深部地壳构造与唐山大地震孕育及发生的关系,国家地震局地球物理研究所在石油部物探局的协助下,于1985年1月在唐山震区完成了64km长的深反射剖面野外观测,获得了高分辨率的整个地壳结构的详细资料。分析结果表明,唐山震区内深度500m以上的沉积层十分破碎;结晶基底为前震旦纪地层,埋深2—7km不等,覆盖地层倾斜,且断层发育,其中陡河断裂为正断层,延深至6—7km,推断该断层为1976年唐山发震的重要构造之一。测线上大约21km深处普遍存在一反射层;莫霍面深度在31—32km左右,与该地区折射剖面得到的结果相当一致。更多还原

【Abstract】 Deep reflection surveys carried out in 1985 are revealing fine structures within the continental crust in Tangshan region. Their records extend to 11.7 seconds (two-way travel time). Well control indicates that the sedimentary layers are stronly deformed and faulted. Basement is represented at depth of 2-7 km, and a normal fault, the Dou-he fault, extends to depth of 6-7 km and the Moho is at depth of 31-32 km corresponding to results from seismic refraction profiling.更多还原