This paper analyzes the spectrum characteristics in Qianguo region, where an ML6. 1 earthquake occurred on October 31, 2013. The ratio of the static stress drop and dynamic stress drop is calculated, and compared with Value Y in Heilongjiang Province. Since 2005, Value Y in Heilongjiang Province is between 0. 3 and 0. 6, which is larger than normal. The earthquake type gives priority with the isolated earthquake. Value Y of Qianguo earthquake is 0. 37, lower than that in Heilongjiang Province.%计算静态应力降与动态应力降之比Y值,根据Y值的大小初步判定地震类型,是震后趋势判定的一种新方法,对震后趋势快速判定有一定意义。通过计算我省历年有影响地震的Y值,发现2005年以来黑龙江省及其周边地区中强地震静态应力降与动态应力降之比( Y值)在0.3~0.6之间,总体来说Y值较大,其地震类型以孤立型地震为主,吉林省前郭县地震Y值为0.37,与我省其他中强地震相比,Y值相对较低,初步判定为震群型地震。
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