Comparative study of the large-scale landslides in the Zhangjian and the Hwang Ho Valleys.

1988年10月1日至21日在新泻和长野县进行了滑坡和泥石流的联合调查，继续与中国科学家在中国进行合作。这些工作的主要结果如下：1.日本调查报道的滑坡为复活型泥石流，而我国的滑坡分为灰岩或白云岩滑坡和复活型泥石流。通过对中国岩滑的研究，有助于了解日本近年来罕见的原生滑坡的滑动机理。暴雨是我国泥石流灾害发生的主要原因，给人们的生命、房屋等造成了巨大的损失。在日本北方，融雪水和暴雨是滑动的触发因素。

Joint investigation have been carried out in the landslides and debris flows in Niigata and Nagano Prefectures in October 1-21, 1988 continued to joint works with Chinese scientists in China. The obtained results from these works can be summarized as follows:1. The investigated and reported landslides in Japan are reactivated debris slides, whereas the landslides in China are divided into two types, limestone or dolomite rock slides and reactivated debris slides. The investigation of rock slides in China may contribute to Understanding the sliding mechanism of primary landslides which are rarely observed in Japan, recently,2. The storms are the main cause for occurrence of debris slides in China which did damage to human lives, houses, et ct.. It is characteristic feature that the snow-melting water as well as heavy rains acts as trigger of sliding in northern Japan.