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地震 ›› 2019, Vol. 39 ›› Issue (4): 136-146.

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华东地区地震空区预报效能评估

汤兰荣, 曾新福, 董非非, 罗丽, 查小惠, 郭雨帆, 曾文敬   

  1. 江西省地震局, 江西 南昌 330096
  • 收稿日期:2019-02-27 出版日期:2019-10-31 发布日期:2019-10-30
  • 作者简介:汤兰荣(1983-), 女, 湖南浏阳人, 高级工程师, 主要从事地震分析预报工作。
  • 基金资助:
    地震科技星火计划青年项目(201402Y); 地震科技星火计划攻关项目(XH16023)

Assessment on Forecasting Effectiveness of SeismicGap in Eastern China

TANG Lan-rong, ZENG Xin-fu, DONG Fei-fei, LUO Li, ZHA Xiao-hui, GUO Yu-fan, ZENG Wen-jing   

  1. Earthquake Administration of Jiangxi Province, Nanchang 330096, China
  • Received:2019-02-27 Online:2019-10-31 Published:2019-10-30

摘要: 对华东地区1970年以来的地震空区进行了预报效能评估。 结果表明: ML≥3.0地震空区的报准率为0.45, 虚报率为0.55, 漏报率为0.57, R值为0.26; ML≥3.5地震空区的报准率为0.31, 虚报率为0.69, 漏报率为0.75, R值为0.08; ML≥4.0地震空区无对应的MS5.5以上地震。 ML≥3.0地震空区的R值高于具有97.5%置信水平的R0值, 具有一定的预报能力, ML≥3.5和ML≥4.0地震空区不具有预报能力。 主震一般发生在空区内部边缘, 震前空区一般不会被打破; 空区的持续时间、 空区尺度、 震级下限与主震震级无明显线性关系; 空区主要分布在江苏、 山东及附近海域。

关键词: 中强地震, 地震空区, 预报效能评估, 华东地区

Abstract: In this paper, forecasting effectiveness of seismic gap was evaluated in Eastern China since 1970. The results show that accurate rate of ML≥3.0 earthquakes gap is 0.45, inflating rate is 0.55, missing rate is 0.57, R value is 0.26. The values of ML≥3.5 earthquakes are 0.31, 0.69, 0.75 and 0.08 respectively. ML≥4.0 gap without corresponding to MS≥5.5 earthquake. R value of ML≥3.0 earthquakes gap is higher than R0 value of 97.5% confidence level, and is has certain forecasting capability, ML≥3.5 and ML≥4.0 earthquakes gap have no forecasting capability. The mainshocks are usually located in the gap and near the edge, the gap will not be broken before an mainshock. There is no obvious linear relationship between the gap lasting time, gap scale, magnitude lower limit and mainshock magnitude. The gaps are mainly distributed in Jiangsu, Shandong and adjacent sea areas.

Key words: Moderate-strong earthquake, Seismic gap, Forecasting effectiveness evaluation, Eastern China

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