This paper analyzed long-wave radiation before the Japan MW9. 0 earthquake with cluster analysis. The results show that a seasonal high temperature band appeared in a wide range of the western Pacific Ocean in August 2010, which extended from the northern Japan trench to the southern Philippine plate boundary. Meanwhile, seasonal changes of vertical crustal movements disappeared in the Japan trench in August 2010. Whether the geophysical field exhibited abnormal variations before the Japan MW9. 0 earthquake? Are the thermal anomalies half year ago related to this earthquake? These problems remain to be explored.%应用聚类分析方法对日本Mw9.0地震前长波辐射进行了分析,结果表明2010年8月在大范围的西太平洋海域,出现一个自北向南逐渐增强的季节性高温条带,该条带从日本海沟中北段开始,一直向南延伸到伊豆小笠原海沟.同时日本海沟的地壳垂直运动自2010年8月份开始出现季节性运动消失的异常现象.这两种现象同时出现是否表明地球物理场在大地震发生前可能出现异常?地震发生前半年时间出现的热异常条带是否与此次地震有关?这些问题有待进一步探索.
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