Using data from the National Center for Environmental Prediction (NCEP), the paper analyzed the surface latentheat flux (SLHF) variations for five inland earthquakes occurred in some lake area, moist area and arid area of Chinaduring recent years. We used the SLHF daily and monthly data to differentiate the global and seasonal variability from thetransient local anomalies. The temporal scale of the observed variations is 1–2 months before and after the earthquakes, andspatial scale is about 10°×10°. The result suggests that the SLHFs adjacent the epicenters all are anomalous high value(>μ+2σ) 8–30 days before the shocks as compared with past several years of data. Different from the abnormal meteorologicalphenomenon, the distribution of the anomalies was isolated and local, which usually occurred in the epicenter and its adjacentarea, or along the fault lines. The increase of SLHF was tightly related with the season which the earthquake occurs in;the maximal (125 W/m2, Pu’er earthquake) and minimal (25 W/m2, Gaize earthquake) anomalies were in summer and winter,respectively. The abundant surface water and groundwater in the epicenter and its adjacent region can provide necessarycondition for the change of SLHF. To further confirm the reliability of SLHF anomaly, it is necessary to explore its physicalmechanism in depth by more earthquake cases.
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机译:利用美国国家环境预测中心(NCEP)的数据,分析了近年来中国一些湖泊地区,湿润地区和干旱地区发生的五次内陆地震的表面潜热通量(SLHF)变化。我们使用SLHF的每日和每月数据来区分全球和季节性变化与瞬时局部异常。观测到的变化的时间尺度在地震前后为1-2个月,空间尺度约为10°×10°。结果表明,与过去几年的数据相比,震中前8-30天,震中附近的SLHF都是异常高值(>μ+2σ)。与异常的气象现象不同,异常的分布是孤立的和局部的,通常发生在震中及其邻近区域或沿断层线。 SLHF的增加与地震发生的季节密切相关;夏季和冬季分别是最大(125 W / m2,普’地震)和最小(25 W / m2,盖兹地震)异常。震中及其邻近地区丰富的地表水和地下水可以为SLHF的变化提供必要的条件。为了进一步确认SLHF异常的可靠性,有必要在更多地震案例中深入探讨SLHF异常的物理机制。
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