香港地区活动断裂的初步探讨  

PRELIMINARY DISCUSION OF ACTIVE RIFT IN HONG KONG AREA

作　　者：丁原章[1,2] 黎权伟 

机构地区：[1]广东省地震局 [2]香港土木工程署

出　　处：《华南地震》1998年第1期84-90,共7页South China Journal of Seismology

摘　　要：香港地区的断裂构造颇为发育，主要有北东、北东东和北西向三组断裂。在现今构造应力场作用之下，北东东和北西向断裂组成共轭断裂系统。由于本地区地震活动水平不高，尚难确定哪组断裂与地震活动密切相关。断层泥的热释光资料表明，断裂的最新活动应在晚更新世，断裂的复发周期应在１０万年左右。目前尚不能肯定哪条断裂为活动断裂。Hong Kong lies within a major NE-trending fault zone that has been reactivated during several tectonic episodes since the Palaeozoic. Three main faults sets are recognized in Hong Kong: a dominant NE-trending set, an NEE- varying to E-trending set and a subordinate NW-trending set. Under the action of the prevailing tectonic stress field, NEE-trending and NW-trending faults system dislocated as a conjugated fault system. Thermoluminescence(TL) dates of fault gouge suggest that there have been three episodes of recent fault activity in Hong Kong, these occurred at approximately at 100000, 190000 and 270000 years BP. TL dating of alluvial sedimentsindicates fault activity in the Late Pleistocene, the possible recurrence interval of major fault activity is about 100000 years. Hence, On the basis of the TL dating alone, it is not possible to demonstrate that the fault system in Hong Kong is activity fault.

关 键 词：活动断裂 地震活动 热释光法 香港 

分 类 号：P315.2[天文地球—地震学] P315.5[天文地球—固体地球物理学]