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本文在前人研究的基础上论证了唐山地震是由垂直力引起的。已有资料表明，唐山地震前其震中区及附近地壳内发生过岩浆上涌。根据地球化学资料对比，可初步确证岩浆上涌可以产生向上作用的垂直力．唐山地震便是岩浆上涌的直接结果。
Based on the previous studies, this paper demonstrates that the Tangshan earthquake is caused by vertical force. The available data show that there was magmatic upwelling in the epicenter area and nearby crust of Tangshan before the Tangshan earthquake. According to the comparison of geochemical data, we can tentatively confirm that the upwelling magma can generate upward vertical force. Tangshan earthquake is the direct result of the magma upwelling.