1999•Earthquake Research in SichuanRequires access
Regional seismic characteristics before Ninglang earthquake on 19 November 1998
Qian Xiao
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Abstract
On 19 November 1998,an M =6 2 earthquake occurred at the Ninglang in Yunnan Province Before this earthquake,the regional seismic intensity around the earthquake epicenter increases and the both accumulative times of earthquake and the release of stress change from the slow linear procedure to the fast non linear procedure This situation of earthquake formed a seismogenic zone and many seismic abnormal phenomenae appeared During the slow linear procedure,the earthquake distribution shows a random pattern But during the fast non linear procedure,the position of earthquake focuses on a future earthquake epicenter step by step