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1)  Long term precursor
长期前兆异常
2)  Precursory abnormity of short-term
短期前兆异常
3)  precursory anomaly
前兆异常
1.
Based on the synthetic math expression of earthquake precursory anomaly information variable in this paper,we acquired the S-values according to the information with precursory anomaly provided by 11 seismic stations and non-precursory anomaly by 7 seismic stations before Xiuyan 5.
本文以地震前兆异常信息量综合数学表达式为基础,结合平滑滤波、消周期及趋势项和从属函数等数据处理方法,对1999年11月29日岫岩5。
2.
Based on the mechanism to induce groundwater anomaly,the interferences of precursory anomaly and its recognition are discussed,and the view of "rain and groundwater interference"is questioned.
按照地下水诱发异常的机理,讨论了诱发前兆异常的干扰与识别问题,并对"降水、地下水干扰"观点提出质疑。
4)  Precursory anomalies
前兆异常
1.
Before the two events,a lot of precursory anomalies of subsurface fluid appeared in north Tianshan mountations area,but there is clearly difference in the anomalies before the two events.
7级地震 ,两次地震前 ,北天山地区地下流体都相继出现了不少前兆异常 ,但两次前兆异常也存在着明显差异。
5)  Precursory Abnormity
前兆异常
1.
Discussion on precursory abnormity of water chymistry mechanism in Wutazui spring;
福州乌鸦咀泉水化学前兆异常机理探讨
2.
There appeared orderly precursory abnormity of underground fluid in the northern Tienshan mountain before the earthquake,and most of them is mid-short term abnormity,concentrating on around Urumqi,which is 265 km or so from the epicenter.
7地震,震前北天山地区的地下流体相继出现一些前兆异常,并且以中短期异常为主,异常主要集中在距震中约265 km的乌鲁木齐附近。
6)  Precursor anomaly
前兆异常
1.
The Research of Precursor Anomaly Characteristic of Ground Resistivity Anisotropy and Its Physical Mechanism in Earthquake;
地电阻率各向异性前兆异常特征及其与地震的关系
2.
Based on the method of anomaly recognition and mark system for the precursor subject, the characteristics of precursor anomaly of the ground fluid have been identified and studied during the Heze M59 earthquake in 1983 and the features of stages, layer and synchronism of precursor anomaly of ground fluid were analyzed.
9级地震前地下流体前兆异常特征进行了识别与研究,分析了菏泽5。
3.
Therefore,we consider that using wavelet transform method to extract seismic precursor anomaly is efficient.
因此,运用小波分析方法可以有效地提取地震前兆异常信息。
补充资料:地震前兆
地震前兆
earthquake precursors
    在地震发生之前一段时间内出现,并能预示地震将要发生的自然现象和仪器反应。前者可由人直接观察得到,称为宏观前兆,后者只能用仪器检测,称为微观前兆。地震前兆在理论上是存在的 ,但在实际工作中尚未找到普遍适用的、可靠的前兆手段。已经发现的、认为可能是地震前兆的现象是从过去的大地震发生之前的异常现象中筛选出来的。它们可以试用,但不是每次都有效。已观测到的震前异常现象有:地壳形变异常、地震活动性异常,以及地震波、地磁、地电、地下水(或所含气体)异常,地声、地光、动物行为异常等。
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