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To help prevent harm when living or working on or near a volcano, countries have adopted classifications to describe the various levels and stages of volcanic activity, the two main volcano warning systems being colour codes and/or numeric alert levels. [7] United States Alert System; Indonesia Alert System [8] Russia; Alaska Alert System
On 4 November 2024, the volcano spewed molten debris at several villages some 4 km (2.5 mi) away, destroying homes and killing at least nine. [74] The Centre of Volcanology and Geological Hazard Mitigation recommended that a 7 km (4.3 mi) radius around the volcano be evacuated. [75] Seven villages were affected by the eruption. [76]
On December 9, PHIVOLCS raised the alert level of Kanlaon from level 2 to level 3 after an explosive eruption occurred at the summit vent at 3:03 p.m. The eruption produced a large plume that rose 4,000 m (13,000 ft) above the vent and drifted west-southwest, with pyroclastic flow moving down the south-southeastern side of the volcano.
In October 2006, the United States Geological Survey (USGS) adopted a nationwide alert system for characterizing the level of unrest and eruptive activity at volcanoes. The system is now used by the Alaska Volcano Observatory, the California Volcano Observatory (California and Nevada), the Cascades Volcano Observatory (Washington, Oregon and Idaho), the Hawaiian Volcano Observatory and the ...
2 Indonesia: 1944 [30] 114 Dieng Volcanic Complex: 1 Indonesia: 1964 [30] 108 to 120 Mount Tarawera: 5 New Zealand: 1886 1886 eruption of Mount Tarawera: 106 Dubbi: 3 Eritrea: 1861 [6] 87 Volcán Arenal: 3 Costa Rica: 1968 [31] 80 Mount Marapi: 2 Indonesia: 1979 1979 eruption of Mount Marapi [32] 79 Mount Mayon: 2 Philippines: 1993 [16] 70 ...
Volcanoes vary greatly in their level of activity, with individual volcanic systems having an eruption recurrence ranging from several times a year to once in tens of thousands of years. [62] Volcanoes are informally described as erupting, active, dormant, or extinct, but the definitions of these terms are not entirely uniform among ...
As of 27 November 2017, the alert level was at its highest and evacuation orders were in place. Tectonic earthquakes from the volcano had been detected since early August 2017, and volcanic activity intensified for several weeks before decreasing significantly in late October. A second, more violent period of major activity began in late November.
MARSEC alert levels, U.S. Coast Guard Topics referred to by the same term This disambiguation page lists articles associated with the title Alert Level System .