Title: Characteristics of Strong Earthquake Activity in Northwest Yunnan and Study on Short-term Earthquake Precursor
Abstract: Based on the historical earthquake data,we study the rhythm of strong seismicity in Northwest Yunnan and get the medium-sized earthquake space evolution images in the neighboring region of epicenters before the M≥6.0 strong quakes occurred in Northwest Yunnan over the past decade. According to the M≥5.0 strong quakes since 1986,we study the activity and equability anomaly of the M≥3.0 or M≥4.0 earthquakes,and the M≥3.0 clusters. The index of short precursor of strong earthquake in northwest Yunnan is given quantitatively. The main results show:(1) before the M≥6.0 quakes occurred in Northwest Yunnan,the M≥4.0 were in equability and M≥3.0 were in activity,the MS3.0 quakes around the potential epicenter were in activity,so the abnormal images of orderly distribution of seismic activity were given including the obvious band,void and intensive areas; (2) the integrated forecasting index Y of the quakes above 6 in short term anomaly in Northwest Yunnan is equal to or greater than 0.5. There are two types of short term precursor model; type one,the anomaly of activity of earthquakes with M≥3.0 appear synchronously with the clusters of earthquakes with 3.0≥M≥4.0. Type two,in the process of the tranquility of the M≥4.0 earthquakes,there are intermittent tranquility of M≥3.0 earthquakes.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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