On September 6th, 2018, at 3:07 local time, a strong earthquake of magnitude Mw = 6.6 struck the east Iburi region in Hokkaido, Japan. Many serious damages such as landslide, liquefaction and collapse of houses occurred from this earthquake. Liquefaction caused road deformation and inclination of houses in Sapporo city, Hokkaido. In order to understand the damage caused by the earthquake, and find a solution to mitigate the liquefaction-induced damage in Sapporo city, a preliminary investigation of the 2018 Hokkaido Iburi-tobu earthquake was conducted from 18 to 20 September 2018. The damages to the houses at Satozuka town and Utsukushigaoka town in Sapporo city are focused on. The damage at Satozuka was so enormous that the residents could not continue to live in their houses. Although the inclination of houses can be seen by visual inspection at Satozuka, there were few houses where the inclination can be judged visually at Utsukushigaoka. Therefore we did a field survey of inclined houses by using a digital angle meter at Utsukushigaoka. The inclination of 57 houses at Utsukushigaoka was measured, and the maximum value and direction of inclination are shown on the map. The houses located at the reclaimed land of the former river and former valley plain were inclined. Therefore, the old terrain greatly affected to the inclination of houses. These liquefaction-induced damage occurred in the same area where liquefaction occurred during the 2003 Tokachi-oki earthquake.

中文翻译：

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日本2018年北海道伊武里东武地震中液化引起的房屋倾斜

2018年9月6日，当地时间3:07，日本北海道东部伊布里地区发生了Mw = 6.6级强烈地震。这次地震造成了许多严重的破坏，例如山体滑坡，液化和房屋倒塌。液化导致北海道札幌市的道路变形和房屋的倾斜。为了了解地震造成的破坏，并找到减轻液化引起的札幌市破坏的解决方案，2018年9月18日至20日对2018年北海道依布里-东武大地震进行了初步调查。札幌市的佐藤冢町和宇津久高冈町的房屋集中在此。佐藤冢市遭受的破坏是如此之大，以至于居民无法继续住在他们的房屋中。尽管可以通过目视检查在佐藤冢看到房屋的倾斜度，但是在Utsukushigaoka可以通过肉眼判断倾斜度的房屋很少。因此，我们在Utsukushigaoka使用数字角度计对倾斜的房屋进行了实地调查。测量了Utsukushigaoka的57栋房屋的倾斜度，并在地图上显示了最大值和倾斜方向。位于前河和前山谷平原开垦土地上的房屋倾斜。因此，旧地形极大地影响了房屋的倾斜度。这些由液化引起的破坏发生在2003年十胜井地震中液化发生的同一区域。因此，我们在Utsukushigaoka使用数字角度计对倾斜的房屋进行了实地调查。测量了Utsukushigaoka的57栋房屋的倾斜度，并在地图上显示了最大值和倾斜方向。位于前河和前山谷平原开垦土地上的房屋倾斜。因此，旧地形极大地影响了房屋的倾斜度。这些由液化引起的破坏发生在2003年十胜井地震中液化发生的同一区域。因此，我们在Utsukushigaoka使用数字角度计对倾斜的房屋进行了实地调查。测量了Utsukushigaoka的57栋房屋的倾斜度，并在地图上显示了最大值和倾斜方向。位于前河和前山谷平原开垦土地上的房屋倾斜。因此，旧地形极大地影响了房屋的倾斜度。这些由液化引起的破坏发生在2003年十胜井地震中液化发生的同一区域。旧地形极大地影响了房屋的倾斜度。这些由液化引起的破坏发生在2003年十胜井地震中液化发生的同一区域。旧地形极大地影响了房屋的倾斜度。这些由液化引起的破坏发生在2003年十胜井地震中液化发生的同一区域。