The characteristics of the medium-term seismic quiescence before 14 moderate or strong earthquakes in Eastern China are studied.The normalized N-T and L-T curves and the statistical parameter βn are adopted.Each point in the isopleth map of βn can show the level of seismic activity and its corresponding duration and end date,which can be utilized to determine the time span of the medium-term quiescence quantitatively.The several seismic activity patterns, with general feature of seismic activity rate from increasing to decreasing before the main-shocks and fluctuation variation of irregular sine wave in N-T and L-T curves,appeared before moderate and strong earthquakes are also summarized.
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宋俊高,王炜,陆锦花.前兆性地震平静在中期预报中的定量研究[J].地震工程学报,1997,19(3):37-43. SONG Jungao, WANG Wei, LU Jinhua. QUANTITATIVE STUDY OF PRECURSORY SEISMIC QUIESCENCE FOR MEDIUM-TERM EARTHQUAKE PREDICTION[J]. China Earthquake Engineering Journal,1997,19(3):37-43.