The East Japan Mega Earthquake with a moment magnitude 9.0 occurred on March 11, 2011 and shook almost the entire japan. There are many abandoned lignite mines in the close vicinity of the epicentral area such as Miyagi and Iwate
Prefectures.and many sinkholes occurred following the earthquake. There are also reports
on the delayed occurrence of numerous sinkholes in the same areas. In addition, some collapses and settlement occurred in abandoned underground quarries in Oya town of Utsunomiya City. The authors investigated damaged areas soon after the earthquake and they present their investigations results. They also discuss their implications in short and long-term performance of abandoned mines and quarries in this article.
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