摘要: |
分析了1965~2014年发生在云南地区的共计223次M≥5.0地震,发现其中有前震的地震74次,占33.2%;云南不同构造区前震的比例差异较大,前震较多的地区是澜沧-耿马地块和腾冲-保山地块;前震与主震的震级差、时间间隔、空间距离优势分布分别为0.5~2.9、10天内和20km内,可以利用这些特点在识别出前震后进而对后续主震做出预测。 |
关键词: 前震 主震 震级差 云南地区 |
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基金项目:云南省地震局继续深入推进预防和处置地震灾害能力建设10项重点工程“前震及其识别技术研究”资助 |
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Spatial-temporal distribution and their statistical characteristicsof foreshocks in the Yunnan region |
Zhao Xiaoyan, Sun Nan, Su Youjin
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Earthquake Administration of Yunnan Province,Kunming 650224,China
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Abstract: |
The 223 earthquakes with M≥5. 0 in the Yunnan region during 1965 ~ 2014 wereanalyzed. Among them,74 earthquakes have foreshocks ( about 33. 2% ) . There is greatdifference between different structures: the Lancang-Gengma and Tengchong-Baoshan block havethe most abundant foreshocks in the Yunnan region; the predominant magnitude difference,timeinterval and spatial distance are 0.5 ~ 2.9,within 10 days and within 20km respectively. We canuse those characteristics to forecast the mainshock after the identification of a foreshock. |
Key words: The Yunnan region Foreshock Mainshock Magnitude difference |