寝室の下に開いた大穴に転落 −−−

時々このテのニュースを見かけますが、人が呑みこまれ（落ち）て行方不明と云うのは珍しい。被害者は何と元フロリダ州知事でブッシュファミリーのジェブ・ブッシュさん！！ −−− と思ったらジェフ・ブッシュ（Jeff Bush）さん；

◆寝室の下に巨大な陥没穴、寝ていた男性が行方不明米フロリダ州
　　2013年03月02日 13:08、AFPBB News

◆
　
　　Florida Sinkhole Rescue Crews Try To Reach Man Swallowed By Massive Chasm
　　MrMagicalBBMan, 公開日: 2013/03/01

◆Seffner sinkhole 911 call: 'Bedroom floor just collapsed"
　　Friday, March 1, 2013 7:44am, Tampa Bay Times

◆Florida Sinkhole: Rescue Crews Try To Reach Man Swallowed By Massive Chasm (VIDEO)
　　AP, 03/01/13 07:30 PM ET EST @ TheHuffingtonPost.com

◆Man swallowed up by 30ft sinkhole in Florida
　　Friday 01 March 2013, The Independent

でも、どうもこの陥没はフロリダでは珍しいことではない様子；

　出典： Sinkholes / Southwest Florida Water Management District.us

■ FGS, Sinkholes in Florida
　　 Florida Geological Survey （Home Page）

　　Sinkholes are a common feature of Florida's landscape. They are only one of many kinds of karst landforms （引用者注：記事末尾の「カルスト」参照）, which include caves, disappearing streams, springs, and underground drainage systems, all of which occur in Florida. Karst is a generic term which refers to the characteristic terrain produced by erosional processes associated with the chemical weathering and dissolution of limestone or dolomite, the two most common carbonate rocks in Florida. Dissolution of carbonate rocks begins when they are exposed to acidic water. Most rainwater is slightly acidic and usually becomes more acidic as it moves through decaying plant debris.　（以下略、引用終わり）

　　⇒ Florida Geological Survey - Data and Maps

以下、他国でのケース；

◆
　
　　'Sinkhole' appears in Guatemala bedroom
　　NewsInWorldNow, 公開日: 2013/01/29