NASAのインスタグラム(nasa) - 3月7日 07時26分

NASA Radar Demonstrates Ability to Foresee Sinkholes - New analyses of NASA airborne radar data collected in 2012 reveal the radar detected indications of a huge sinkhole before it collapsed and forced evacuations near Bayou Corne, La. that year. The findings suggest such radar data, if collected routinely from airborne systems or satellites, could at least in some cases foresee sinkholes before they happen, decreasing danger to people and property.
Sinkholes are depressions in the ground formed when Earth surface layers collapse into caverns below. They usually form without warning. The data were collected as part of an ongoing NASA campaign to monitor sinking of the ground along the Louisiana Gulf Coast.

Their analyses showed the ground surface layer deformed significantly at least a month before the collapse, moving mostly horizontally up to 10.2 inches (260 millimeters) toward where the sinkhole would later form. These precursory surface movements covered a much larger area -- about 1,640 by 1,640 feet, (500 by 500 meters) -- than that of the initial sinkhole, which measured about 2 acres (1 hectare). Aerial photo of a 25-acre sinkhole that formed unexpectedly near Bayou Corne, La., in Aug. 2012.

Image Credit: On Wings of Care, New Orleans, La.

#sinkhole #nasa #radar #bayou #louisiana

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