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2:13
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USGS
Caldera Demonstration Model
More information on the USGS Multimedia Gallery: http://gallery.usgs.gov/videos/333 A caldera is a large, usually circular volcanic depression formed when magma is withdrawn or erupted from a shallow underground magma reservoir. It is often difficult to visualize how calderas form. This simple experiment using flour, a balloon, tubing, and a ...
422.6K views
Dec 29, 2010
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Volcano Eruptions
0:38
WATCH: The effusive eruption at Mayon Volcano continues for the 28th consecutive day, producing incandescent lava flows, pyroclastic density currents (PDC) or “uson,” and rockfall. Lava flows have reached radial distances of around 3.7 kilometers in the Basud (east), 1.6 kilometers in the Bonga (southeast), and 1.3 kilometers in the Mi-isi Gullies, based on footage from the VMLH (Ligñon Hill) IP Camera as of February 3, 2026, according to PHIVOLCS. Alert Level 3 remains in effect over Mayon, and
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GMA News
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0:31
WATCH: Mayon Volcano on Tuesday night continued to shed incandescent pyroclastic density currents (PDCs) and rockfalls amid the 28th consecutive day of its effusive eruption, PHIVOLCS said. “Alert Level 3 prevails over Mayon and entry into the 6-km Permanent Danger Zone should be prohibited,” the agency stressed. Video courtesy: PHIVOLCS Read more: https://www.gmanetwork.com/news/topstories/regions/975260/look-mayon-volcano-continues-to-shed-uson-lava-flows-rockfalls-on-tuesday-night/story/ | GM
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