渭河地震带地裂与地震活动的周期性

近年来,渭河地震带10个县、市发现地裂缝,其中西安市区有7条,共长26.3公里,危害城市建设。作者在咸阳、西安、渭南发现了埋在地下的汉、唐、明等朝代的古地裂缝,它们与史料记载的18次地裂共同组成四个完整的长周期,各长700——800年,与地震活动周期相一致。 这些规律为该区地裂与地震活动的预报提供了一些新依据。

PERIODICITY OF GROUND FISSURES AND EARTHQUAKES IN THE EARTHQUAKE BELT OF THE WEIHE RIVER

In recent years, ground fissures were found in ten prefectures or cities in the earthquake belt of Weihe River. There are 7 ground fissures in Xian city that total 26.3 km in length. They constitute a great threat to city construction. The auther has also found historical fissures of the Han, Tang and Ming Dynasties buried ibelow the ground surface in the cities of Xianyang, Xian and Woman. These newly discovered fissures, together with 18 fissures recorded in history, form four groups each with a period of 700-800 years that conform with earthquake periodicity.The result of the observations may provide a new -basis, for the prediction of ground fissures and earthquakes in the earthquake belt of the Weihe River.