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大地电磁测深结果表明,唐山地区深部电性中存在壳内高导层和上地幔高导层,其分别埋深为20公里和100公里左右,均显示为南浅北深。资料对比表明唐山、宁河地震都发生在两个高导层埋深变化梯度带上,其震源深度都不超过壳内高导层的埋深。此外,在该区南部发现埋深约45公里高导层,我们认为有可能为上地幔中间高导层。
The results of the geomagnetic survey show that there are high-conductivity shells and high-conductivity mantle layers in deep electrical properties in Tangshan area, which are respectively buried at depths of 20 km and 100 km, showing a south shallow north. The data comparison shows that both Tangshan and Ninghe earthquakes occur on the two gradient zones with high buried depth, and their focal depths do not exceed the depth of the high-conductivity layer in the crust. In addition, a high-lying layer about 45 km deep is found in the southern part of the area, which we think may be the middle high-conductivity layer of the upper mantle.