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Saturday, May 25, 2013
The volcano remains restless and shows significant degassing activity. Elevated SO2 emission visible on the latest NOAA satellite data is probably the result of the recent magma intrusions. Seismic recordings show internal fluid movements, degassing tremor and occasional small quakes.
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Thursday, May 23, 2013
Small ash emissions were reported yesterday from the volcano. Seismic activity remains elevated, but reduced compared to the recent earthquake swarms in April and early May.
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Nevado del Ruiz volcanostratovolcano 5321 m / 17,457 ft
Colombia, 4.9°N / -75.32°W Current status: minor activity or eruption warning (3 out of 5) Nevado del Ruiz webcams / live data [hide map] [enlarge map]
Last update: 25 May 2013
Typical eruption style: explosive Nevado del Ruiz volcano eruptions: 1994, 1985-91, 1984-85, 1916, 1845, 1833?, 1831, 1829, 1828, 1826(?), 1805, 1623, 1595, 1570, 1541(?) Nevado del Ruiz Volcano Photos Last earthquakes nearby:
Background:Nevado del Ruiz covers more 200 sq km and it is composed by 3 major andesitic and dacitic edificed of lavas and tuffs. The present-day cone is composed by lava domes built within the summit caldera of the older Ruiz volcano. Its summit contains the 1-km-wide and 240-m-deep Arenas crater.The prominent La Olleta flank cone on the SW flank was probably built in historic time. Nevado del Ruiz has repeatedly produced large mud flows (lahars), triggered by melting of the summit glacier during eruptions. Deposits of these mud flows are found on its broad flanks and these events have been known since the 16th century. Nevado del Ruiz Photos:
1985 Armero mud flow disaster
Nevado del Ruiz erupted on 13 November 1985. Although the eruption was small, it caused a large mud flow which swept through the town of Armero almost 40 km away from the summit where more than 23,000 people were killed. The event caused a heated debate because government officials chose to ignore volcanologists' warnings of the imminent danger of the advancing lahar. The eruption itself had been preceded by increased fumarolic, phreatic and seismic activity for a year. The tragedy was South America's worst and globally the 4th worst volcanic known disaster. The event was even more tragic, because it the same events had already occurred at least 2 times during earlier eruptions. ...more |
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