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Maximum　entropy　spectral　characteristics　of　seismic　activity　for　great　earthquakes　in　China

Acta Seismologica Sinica(English Edition) 1997年第1期10卷 8-15页

作者：宋治平梅世蓉武安绪薛艳

The maximum entropy spectral characteristics of seismicity in the seismic enhanced region of 11 great earthquakes is analysed in this paper to seek the difference of seismic period spectral structure between the normal and the abnormal stage of seismic activity in this paper. The results show that, during decades or even one hundred years before great earthquakes, only short periods with 6.5～24.3 years appear, and long ones disappear. Otherwise, long periods with 18.5～38.5 years exist chiefly within the normal stages. Decades years after great earthquakes, the period spectra of seismicity are generally about several or ten years. Then the characteristics of great earthquakes is explained physically by applying the strong body seismogenic model, so a method of studying and predicting great earthquakes is offered.

关键词： great earthquake maximum entropy spectrum short period long period strong body seismogenic model

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Analysis of the characteristics of gravity waves during a local rainstorm event in Foshan,China

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Atmospheric and Oceanic Science Letters 2020年第2期13卷 163-170页

作者： WANG Xiujuan LEI Hengchi FENG Liang ZHU Jiangshan LI Zhaoming JIANG Zhongbao Key Laboratory of Cloud-Precipitation Physics and Severe Storms of Chinese Academy of Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Meteorological Observatory of Jilin Province Jilin Province Meteorological BureauChangchunChina Foshan Tornado Research Center Foshan Meteorological BureauFoshanChina Climate Center of Jilin Province Jilin Province Meteorological BureauChangchunChina

A detailed analysis of the dynamic frequency spectrum characteristics of gravity waves(GWs)during a local heavy rainfall event on 20–21 November 2016 in Foshan,China,is *** results of this analysis,which was based on high-precision microbarograph data,indicate that GWs played a key role in generating the *** GWs experienced two intermittent periods of amplitude enhancement and period *** largest amplitudes of the GWs were 80–160 Pa,with a corresponding period range of 140–270 min,which were approximately 4 h ahead of the *** severe storms appeared to affect the GWs by augmenting the wave amplitudes with center amplitudes of approximately 80–100 Pa and periods ranging between 210 and 270 min;in particular,the amplitudes increased to approximately 10 Pa for GWs with shorter periods(less than 36 min).The pre-existing large-amplitude GWs may be precursors to severe storms;that is,these GWs occurred approximately 4 h earlier than the time radars and satellites identified ***,these results indicate that large-amplitude GWs constitute a possible mechanism for severe-storm warning.

关键词： Gravity wave microbarograph dynamic characteristics short period long period amplitude

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