But such extreme damage, formally referred to as “catastrophic ground cover collapse” in insurance parlance, is actually quite rare. Instead, sinkholes are generally smaller depressions that ...
These sinkholes form like gradually deepening depressions as the loose surface layer of sediment trickles down into gaps in the underlying rock below. Cover-Collapse Sinkholes: The most dangerous ...
Ono said he thought the sinkhole may have been caused by a "crack in the Nakagawa River Basin sewer pipe," NBC News reported. According to government officials in Saitama Prefecture, the collapse ...