2007年11月8日 CNNニュースから Magma pushing up ground in Yellowstone(イエローストーンでマグマが地表面を押し上げている) updated 2:49 p.m. EST, Thu November 8, 2007 www.cnn.com (画像) Yellowstone's Great Fountain Basin spews in file photograph provided by the National Parks Service.
WASHINGTON (AP) -- Yellowstone National Park, once the site of a giant volcano, has begun swelling up, possibly because molten rock is accumulating beneath the surface, scientists report.
But, "there is no evidence of an imminent volcanic eruption," said Robert B. Smith, a professor of geophysics at the University of Utah. Many giant volcanic craters around the world go up and down over decades without erupting, he said.
Smith and colleagues report in Friday's issue of the journal Science that the flow of the ancient Yellowstone crater has been moving upward almost 3 inches per year for the past three years. That is more than three times faster than ever observed since such measurements began in 1923, the researchers said.
"Our best evidence is that the crustal magma chamber is filling with molten rock," Smith said in a statement. "But we have no idea how long this process goes on before there either is an eruption or the inflow of molten rock stops and the caldera deflates again."
It's not unusual for ancient volcano sites like Yellowstone and Long Valley, California, to rise and fall, according to the researcher
>>18 確かに研究費の問題は切実だw だけど一応アメリカ地質調査所も群発地震の情報出してるよ。 水蒸気爆発発生の可能性はあるらしい。 http://volcanoes.usgs.gov/ Latest U.S. Volcano Alerts and Updates for Thursday, Jan 1, 2009 at 14:12:09 PST 2009-01-01 15:01:46 Yellowstone Normal Green ------------------------ イエローストーン火山のステータスリポート Yellowstone Recent Status Report, Updates, and Information Releases http://volcanoes.usgs.gov/yvo/activity/