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Mt - St. Helens volcano (Washington): small earthquake swarms no signs of worries
Since the beginning of 2016, a swarm of small earthquakes has been occurring at under the volcano, suggesting that another phase of magma recharge is currently taking place. The recorded quakes have been at shallow depths between 2-7 km under the summit and ranged in magnitudes from 0 (or less) to 3 on the Richter scale, i.e. they are all tiny. Only rarely, they exceeded magnitude 2 and only a very few might have been felt by persons being very close.
The current swarm is only one of a series of similar swarms that have taken place since 1988, including some much more energetic ones (such as during 1998-99). Most such earthquake swarms, not only at Mt. St. Helens, but at almost any volcano, are NOT followed by eruption, or at least not immediately. In the case of Mt. St. Helens, the large earthquake swarm during 1998-99 preceded the small effusive activity during 2004-2008 by 5 years.
For the time being, USGS keeps the volcano at alert level green (=normal); the observed seismic activity is too small to justify a raise in alert and is best seen as part of the normal activity during a dormant phase of the volcano.
Nevados de Chillán volcano (Chile): new ash eruptions
Two new phases of ash explosions occurred at the volcano this morning. The first and strongest occurred at 13:03 local time, generating a dense ash plume that rose 1700 m above the crater, followed by a weaker series of ash emissions at 14:40. The eruption plumes caused moderate ash falls in areas up to a few km downwind (north) of the crater as well as small mud flows on its upper slopes. The latter were the result of rapid interaction of hot tephra (the erupted fragmented material) with snow. The new activity, sign of the volcano's ongoing phase of unrest, had been preceded by increasingly frequent gas and steam puffs since around yesterday evening; some of them possibly contained light ash ash well.
According to SERNAGEOMIN, the seismic activity of the volcano has been at fluctuating, but generally low energy levels during the recent weeks. Out of 614 seismic events detected during 16-30 April, more than 90% were related to internal fluid movements, in turn indicative of interaction of the volcano's (deeper) magmatic with the shallow hydrothermal system.
Strong Eruption of Volcano Affects Capital of Costa Rica PDF Imprimir E-Mail San Jose, May 12 (Prensa Latina)
The strong eruption by volcano Turrialba at the 01:19 local time affected a great part of the Costa Rican capital, which got up Thursday covered by a thin layer of ashes. Television stations transmitted images of the exact moment of the explosion, with a column of smoke and ashes, gases and other materials.
Most of the affectations were located in the Central Valley, particularly San Jose, the capital, and the smell at sulfur was still present, just as ashes in the air.
This increase in its emanations forced the National Commission of Emergencies (CNE) to adopt a series of measures, as the suspension of classes and the extension of the yellow alert from two to five kilometres in the surroundings of the Turrialba.
For the experts, the eruption of this dawn is comparable with the ones reported in October, 2014 and March 2015, when the hill presented strong eruptions.
What calls the attention is that after the emanations of last days, the volcano diminished its emanations and the CNE decided to raise the adopted measures.
Awu volcano (Sangihe Islands, Indonesia): alert level raised to second highest level
VSI raised the alert level of the volcano from 2 ("waspada") to 3 ("siaga" = eruption warning) yesterday - presumably because of increased seismic activity observed.
Ruapehu volcano (New Zealand): alert level raised due to increased degassing and heat output Friday May 13, 2016 18:38 PM | BY: T The alert level of the volcano was raised by a notch from 1 to Level 2 (moderate to heightened unrest) last Wednesday, Geonet informed in a special note. This was triggered by recent measurements that showed an increase in the degassing from Mt Ruapehu’s Crater Lake, a rise in temperature from 25 to 45 deg C since mid April, and ongoing moderate levels of volcanic tremor (reflecting the degassing). The Aviation Color Code was also raised from Green to Yellow.
Situation Update No. 2 on May 20 2016 05:08 PM (UTC)
Fears are mounting a massive volcanic eruption could be on its way after a swarm of 62 mini-earthquakes were recorded around one of American's biggest mountains. A series of tremors continued for around 24 hours. Minor tremors are common around the Mt Hood volcano, which is located near to Portland, Oregon, with around three recorded every week within a 10 kilometre radius of the volcano. But for 63 in just 24 hours is extremely rare and could be a sign that an eruption is on its way. A spate of small tremors around a volcano usually signifies that magma and gasses beneath the surface are beginning to navigate their exit. Portland State University Geology Professor Emeritus Scott Burns told KATU News: "If you get swarms under a working volcano, the working hypothesis is that magma is moving up underneath there." The tremors began on Sunday and continued into the beginning of this week. The massive volcano, which reaches a height of 3,429 metres, has experienced four major eruptions in the last 15,000 years, but three of those have come in the last 1,800 years. The last major one occurred in 1782 and erupted for almost two decades. The news follows on from a similar announcement regarding St Helens volcano in Washington, where a spate of tremors have also been felt. Professor Burns continued: "It just reminds us that we live in a geologically active area. Volcanoes do occur periodically. "It may be related to an eventual eruption. If it is, we will know well in advance." Yellowstone volcano has been another US volcano which has showed signs that it is about to burst into life. Terrifying footage recently emerged which shows steam and ash rising beneath the surface of the 2,805m tall volcano, which is probably the deadliest in the US, in Wyoming, fuelling fresh concern it could be about to blow.
Costa Rica's Turrialba volcano spews ash into neighboring communities
Loud explosions were heard for the third straight day in central Costa Rica as the Turrialba volcano remained active on Friday.
Volcanic activity first began on Wednesday, but the most powerful in a string of eruptions was reported around 7:20 a.m. local time Friday, according to the Tico Times. Ash was reportedly spewing up to 3 kilometers (2 miles) into the air.
The volcano, which is located about 50 kilometers (31 miles), east from the nation's capital of San Jose, reportedly forced some airlines to cancel or divert flights into the country.
Costa Rica's National Emergency Commission of Risk Emergency and National Response (CNE) implemented a perimeter of 5 kilometers (3 miles) around the crater for health and safety reasons.
According to reports from the TV channel CB24.tv News Central America, in downtown San Jose, Costa Rica, there have been some situations among the inhabitants, such as difficulty breathing and blinking normally, after the eruption of Turrialba volcano and the falling ash.
3 die as Sumatra volcano erupts
Three people died and four others were critically injured on Saturday after a highly active volcano in western Indonesia erupted violently, shooting hot ash and gases into the atmosphere, an official said. The victims were all farming on the slopes of Mount Sinabung, a rumbling volcano on Sumatra island, when they were consumed by clouds of hot gases, disaster agency spokesman Sutopo Purwo Nugroho said. "Seven people were exposed to the hot clouds, killing three and leaving four others in critical condition," he said in a statement, adding the injured had been taken to hospital. Several houses were also destroyed during the eruptions, which sent hot gases and columns of ash three kilometres into the sky, he added. The victims were farming within the "red zone", an area four kilometres from the volcano declared off-limits by government authorities for safety reasons.
HAWAII VOLCANOES NATIONAL PARK, Hawaii – The dramatic show continues at Puʻu ʻŌʻō, where lava flows continue to issue down the flanks of the volcanic vent in long channels. The activity associated with two new lava flows that began on May 24 changes on a day-to-day basis, say the photographers who dedicate themselves to documenting the volcano. Videographer Mick Kalber reported the lava from breakouts on the north and east flanks of Puʻu ʻŌʻō are still not advancing much but are spreading out. “Interestingly, the northern flow was mostly inactive” on Sunday (May 29), Kalber wrote in a description of his video taken from a Paradise Helicopter overflight. He said the southern lobe erupting from the east-flank breakout appeared to be increasing in activity.