On october 23 , an earthquake measuring 6 . 8 on the richter scale and striking only 13 kilometers underground rocked the central niigata region , killing 40 people 去年10月23日，一场发生在地面以下仅13公里处的里氏6 . 8级地震袭击了日本新滹市中心，造成40人丧生。
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This paper computed the weight of influence factors by gray pertinence method and bp network , and assessed shallow groundwater resource vulnerability in the hufu plain in 1984 and 2000 by the integrated method 摘要采用灰色关联度法和bp神经网络法计算各指标权重，然后用综合指数法分别对滹滏平原1984年和2000年地下水资源脆弱性进行了评价。
