SHORT-TERM AND INTERMEDIATE-TERM GEOCHEMICAL PRECURSORS
SHORT-TERM AND INTERMEDIATE-TERM GEOCHEMICAL PRECURSORS
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DOI：
10.1007/bf00878999
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发表时间：
1988-01-01
影响因子：
2
通讯作者：
SANO, Y
中科院分区：
文献类型：
--
作者：
WAKITA, H;NAKAMURA, Y;SANO, Y
观测资料中异常现象的检测是地震预报研究的基础。在一个案例中，对日本地下水氡浓度的连续监测显示出与附近地震相关的短期异常。然而，除了1978年伊豆大岛金海地震（M7.0）外，没有发现异常变化。这可能部分是由于难以从观测数据中检测到不重要的干扰信号，其中通常包含噪声引起的波动，部分是由于对控制干扰现象出现的机制缺乏了解。为了加深对地下水氡浓度变化规律的认识，本文对具有显著特征的水文前兆进行了分析。讨论了异常现象出现的复杂性和具体地震归属中的问题。
Detection of precursory phenomena in observation data is essential to earthquake prediction studies. Continuous monitoring of radon concentration in groundwater in Japan in one case showed a short-term anomaly related to a nearby earthquake. With the exception of the 1978 Izu-Oshimakinkai earthquake (M7.0), however, no abnormal change has been noted. This may be due partially to difficulty in detecting insignificant precursory signals from observation data, which ordinarily contains a noise-induced fluctuations, and partially to lack of understanding of the mechanism controlling the appearance of precursory phenomena. In order to increase our knowledge of the variation pattern of precursory changes in radon concentration of groundwater, hydrologic precursors with significant features are examined in this paper. Complexity of appearance of precursory phenomena and problems in assignment of the specific earthquake are discussed.