To establish a method to evaluate the stability of masonry walls, it is required to collect on masonry wall structures and earthquake damages. This investigation found that most of the masonry walls along the railroad in question are constructed by ashlar; most of high masonry walls are constructed by uncoursed masonry; and coursed masonry is used only in part. There are three types of back-fill structure which are dry masonry, wet masonry and Aibaneri-zumi, it is intermediate method of dry and wet masonry, of which dry masonry and wet masonry are dominant. The average height is about 3m with dry masonry and 6m with wet masonry walls. There are some walls that highly stable even though made of low strength backfill concrete. Haramidasi is one of the characteristic deformation modes of masonry walls that features the largest displacement at the middle height.

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