[Vulkanen] The ring of fire #6: Waar diverse vulkanen puffen

quote:

Magma rising in Washington state's Mount St. Helens volcano

(Reuters) - Magma levels are slowly rebuilding inside Mount St. Helens, a volcano in Washington state that erupted in 1980 and killed 57 people, although there was no sign of an impending eruption, U.S. scientists said.

The roughly 8,300-foot volcano erupted in an explosion of hot ash and gas on May 18, 1980, spewing debris over some 230 square miles and causing more than a billion dollars in property damage. Entire forests were crushed and river systems altered in the blast, which began with a 5.2 magnitude earthquake.

"The magma reservoir beneath Mount St. Helens has been slowly re-pressurizing since 2008," the U.S. Geological Survey said in a statement on Wednesday. "It is likely that re-pressurization is caused by (the) arrival of a small amount of additional magma 4 to 8 km (2.5 to 5 miles) beneath the surface."

The USGS said this is to be expected with an active volcano and does not indicate "the volcano is likely to erupt anytime soon."

The USGS, and the Pacific Northwest Seismic Network at University of Washington, closely monitor ground deformation and seismicity at the volcano. This summer, they will also measure its released gases and gravity field, measurements that can be used to monitor subsurface magma and forecast eruptions.

quote:

Evacuations near volcano in El Salvador
At least 1,000 people living near the Chaparrastique volcano have been evacuated as a precautionary measure after seismic activity increased at the volcano, Salvadoran civil protection authorities said Monday.

There was an explosion early Monday and the volcano then spewed reddish ash, officials said.

The Civil Protection Department said in a statement that an alert had been declared for the municipality of San Miguel, where the volcano is located. The city of San Miguel itself is 50 kilometres from the volcano. It is one of the largest cities in the Central American country.

The 2,129-metre volcano is about 145 kilometres east of San Salvador, the capital of El Salvador.

The volcano's last significant eruption was in 1976.

quote:

Op donderdag 29 mei 2014 11:53 schreef Treehut362 het volgende:
De Bromo is de bekendste vulkaan op het eiland Java, Indonesië.
[ afbeelding ]

quote:

Op donderdag 29 mei 2014 12:14 schreef Treehut362 het volgende:

[..]

mijn vader is er geweest

quote:

Alaska Pavlof Volcano Erupts: Alert Level At Orange

The Alaska Volcano Observatory (AVO) issued a red alert warning this week when the Pavlof Volcano shifted into an intense eruption, sending ash 22,000 feet into the air.

Pavlof is located in an uninhabited region of the Alaska Peninsula, 625 miles southwest of Anchorage.

This is the state's first red alert since 2009, Reuters reports, when Mount Redoubt sent ash flying 50,000 feet into the air, disrupting air traffic.

This week's eruption didn't aggravate airline activity.

Pavlof's alert level was slightly lowered to Orange by late Tuesday because seismic tremors had decreased for the past 12 hours, but scientists are still watching the volcano closely.

"It can erupt for weeks or months," observatory research geologist Michelle Coombs told Reuters.

The event over the weekend was unusual because scientists did not initially detect elevated seismicity below the mountain. Instead, scientists using satellite signals detected elevated surface temperatures late Friday afternoon.

A lava flow began from a vent on the north side of the mountain a few hundred meters from the peak, and scientists began to see plumes heading to the east and northeast at 9,000 to 10,000 feet.

Around 3 p.m. Monday, there was a considerable uptick in seismicity, according to Game McGimsey, a volcanologist at the observatory, prompting the red warning alert.

quote:

Volcanoes are waking up in the Aleutians
Sharply increased seismic activity and volcanic eruptions in the Aleutian Islands and the far western Brooks Range are being investigated by scientists.

The Alaska Volcano Observatory says the activity over the past few months is the most seen by the station 26 years.

On the Alaska Volcano Observatory website three volcanoes are classified with a yellow alert level—signifying signs of elevated unrest above known background levels—and three are at an orange alert level—heightened unrest with increased likelihood of eruption.

Orange is the second-highest alert level after red signifying an eruption that is imminent or underway.

Pavlof Volcano released an ash plum in May that diverted aircraft. The 8,262-foot (2,518-meter) tall volcano erupted sending ash plumes as high as 30,000 feet (9,144 meters). Aircraft were advised to avoid the area since ash could damage airplane engines.

With heightened activity from all volcanoes, scientists still don't have enough information to point to any larger trend or activity.

"At this point, you know, we have to say it’s coincidental," he said in an interview with radio station KTOO News.

"It could be that there is a larger process at work, but we’re not able to say what that is at this point in time, or if there is such a process. You know, perhaps the answer is we haven’t been looking long enough to know."

The government agency posted news updates on its Facebook page today showing elevated surface temperatures at the summit of Shishaldin Volcano.

quote:

San Cristobal (El Salvador) unleashes steam and ash
At about 1:50 pm the San Cristobal volcano, located in the department of Chinandega reported an explosion, according to El Nuevo Diario reported Maj. Carlos Caceres Mendoza, departmental head of the Civil Defense in this department, where also several people managed see a column of smoke between 80 to 100 meters, throwing colossus material between ash and sand.

Neighbors sector of the region "The Greece 1, 2 and 3" were observed ash and fine sand that fell on the road, thrown by the volcano as well as residents of the estates "La Roja", "Flags", near to San Cristobal.

In this situation, the Civil Defense Chinandega is under continuous observation of the volcano who informed that this is a gasification process of the Colossus and watch him be for any damage that may be caused in the regions close to San Cristobal.

twitter:

teideano twitterde op dinsdag 22-07-2014 om 12:07:59 Extreme vibration at San Miguel #volcano in El Salvador. Increíble el estado sísmico del #volcàn San Miguel. #science http://t.co/n624Sybi8k reageer retweet