Characteristic Research of Seismic Activity of ML4 Earthquakes in Yinchuan Region
ZENG Xianwei
MA Heqing
REN Xuemei
TAN Junlin
LUO Guofu
Abstract：The characteristic of ML 4 earthquakes in Yinchuan region since 1970 is time clustering. The paper analyzes the activity characteristic of earthquakes from three aspects, that are distribution characteristic of small earthquakes before the main earthquake and aftershocks, parameters of aftershock sequence, and focal mechanism of the earthquakes. The results show that:every earthquake has certain independence when occurring;the two calculable earthquake sequences are non precursory earthquake swarm, that is consistent with the actual; seismogenic faults of the several earthquakes showed by focal mechanism belong to Yinchuan buried fault, and it may be related to a series of minor faults near the buried fault. Then, the authors conclude that local stress adjustment may cause several earthquakes occurring, and there is no relationship between the several earthquakes and the big earthquake occurring in the region in the future. At the same time, the authors can speculate about a possibility of felt earthquakes with similar magnitude still occurring in the region in the future.
Keywords：Yinchuan regionAftershock sequenceFocal mechanismTime clusteringYinchuan buried fault
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 49-55 )