青藏高原北部地区地震空区初步研究
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摘要
研究了青藏高原北部地区地震空区的时空演化特征,结果表明大部分MS≥5地震在孕育发展过程中会形成空区,从孕震空区形成到发震,最短时间1个月,最长时间2a,优势发震时段为4~15个月。孕震空区可作为青藏高原北部地区MS≥5地震1年尺度的中期预报指标;逼近地震的出现可作为孕震空区形成之后半年内发震的短期指标。
In this paper, the features of spatial-temporal distribution and processes of evolution of seismic gap are studied in the northern area of Tibet Plateau. The results show the seismic gap may form in the process of preparation and development of major M_S≥5.0 earthquakes in this area. The duration from the forming of the seismogenic gap to the occurrence of the earthquake is 1 (the shortest time) to 24 (the longest time) months and the most possible occurrence time is 4-15 months. So it can be regarded as a mid-term (one year) prediction index of M_S≥5.0 earthquakes in the northern area of Tibet Plateau, and the imminent earthquake may be taken as a short-term index of half a year in earthquake prediction after a seismogenic gap forms.
引文
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