摘要
根据华北地区分布的 ３３ 个水化观测点的水氡观测资料，以半年为尺度对唐山７．８ 级地震前水氡的异常演化过程进行了研究，认为：唐山 ７．８ 级地震前水氡异常存在由外围向震中区演化的异常特征，且在唐山地震发生的短临阶段，水氡异常在唐山地区形成集中。
On the basis of water radon data of 33 wells distributed in North China and taking per half of a year as a scale,the evolution processes of the water radon before the Tangshan M7.8 earthquake are studied.The results are:the water radon anomalies were progressively developed from the outer ring to the epicentral area before the Tangshan M7.8,the earthquake occurred in its short-imminent stage,at this stage,water radon anomalies were accumulated at Tangshan area and the anomalous intensity was the bigest. Subject words:Tangshan earthquake;water radon;featurephora stylosa, Hyoporum bontioides, etc. , growing in some coastal areas in Guangdong province, China. It is found that, in addition to the differences in the activities of PPO and POD in the leaves of mangrove plants of different kinds, mangrove plants of the same kind but growing in different areas also differs from each other. Possible reasons are discussed in the paper.
出处
《华北地震科学》
1999年第2期79-85,共7页
North China Earthquake Sciences
