Bidirectional muographic measurements were conducted at the Imashirozuka burial mound, Japan. The mound was built in the beginning of the 6th century as a megalithic tomb and later collapsed after a landslide caused by the 1596 Fushimi earthquake, one of the largest earthquakes that has occurred in Japan over the last few centuries. The measurements were conducted in order to find evidence of this past disaster recorded in this historical heritage site. As a result, the vertical low-density regions were found at the top of the mound. These regions were interpreted as large-scale vertical cracks that caused the translational collapse process behind the rotational landslide that was already found in prior trench-survey-based works. These results indicate that there was an intrinsic problem with the stability of the basic foundation of the Imashirozuka mound before the 1596 Fushimi earthquake.

中文翻译：

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地理摄影作为研究古代墓葬中记录的历史地震的新工具

在日本Imashirozuka墓冢上进行了双向胶印测量。该土墩建于公元6世纪初，是一座巨石墓，后来因1596年伏见地震（日本过去几百年来最大的地震）造成的山体滑坡而倒塌。进行测量是为了找到记录在该历史遗产遗址中的过去灾难的证据。结果，在土丘的顶部发现了垂直的低密度区域。这些区域被解释为大规模的垂直裂缝，导致了在先前基于沟槽测量的工程中已经发现的旋转滑坡背后的平移塌陷过程。