关键词: 氢气, 灵敏元素, 首都圈地区

Abstract:

Following M7.8 Tangshan earthquake of 1976,6 moderate-strong earthquakes with magnitude of greater than 5 and a sequence of moderate-small earthquakes with magnitude of greater than 3.5 had occurred successively in the capital circle untill 1991, such as M6.9 Ninghe earthquake of 1976 and M6.1 Datong earthquake of 1989 and so forth. A distinct increase of anomalous cocentration of hydrogen in thermal underground water might be observed by the hydrochemical monitoring network lying in the Beijing area preceding or following moderate-strong earthquakes and parts of moderate-small earthquakes, with its amplitude up to a few times or more than ten times, even to tens,of times the normal background value, which returned to the normal following the earthquake, suggesting that groundwater hydrogen forms a part of geochemical compositions sensitive to the stress-strain of the layers and also that it is a hopeful tool for the prediction of earthquakes.

Key words: Hydrogen, Sensitive element, Capital circle