[vulkanen] The ring of Fire

quote:

Op zondag 15 januari 2006 10:48 schreef star_gazer het volgende:
Ik ben net terug uit Indonesie... Heb de Semeru zien uitbarsten, de Bromo zien roken, de Tankuban Parahu zien roken en de Merapi gezien Kortom, het was zeer gesaagd

quote:

Op zondag 15 januari 2006 10:48 schreef star_gazer het volgende:
Ik ben net terug uit Indonesie... Heb de Semeru zien uitbarsten, de Bromo zien roken, de Tankuban Parahu zien roken en de Merapi gezien Kortom, het was zeer gesaagd

quote:

Op maandag 16 januari 2006 08:24 schreef Frutsel het volgende:

[..]

vogelgriep meegenomen?

quote:

Surviving Disaster
Tue 17 Jan, 9:00 pm - 10:00 pm 60mins

Eruption at Mount St Helens

Drama documentary retelling the story of the 1980 eruption of Mount St Helens in Washington State from the perspective of scientists and locals, all working and living in the shadow of this time bomb. With surrounding towns and lives at risk, and some locals refusing to move, scientists battled against the clock to try and unlock the mountain's secrets. Features testimony from a range of eye witnesses with first hand accounts of the devastation.

quote:

Op dinsdag 17 januari 2006 10:01 schreef Againzender het volgende:
Misschien interessant om vanavond te kijken, 22:00 uur op BBC1 over de beruchte explosie van Mount St Helens:
[..]

quote:

Op dinsdag 17 januari 2006 18:19 schreef francorex het volgende:

[..]

Dank u, een goeie tip.

quote:

Op dinsdag 17 januari 2006 10:01 schreef Againzender het volgende:
Misschien interessant om vanavond te kijken, 22:00 uur op BBC1 over de beruchte explosie van Mount St Helens:
[..]

quote:

Op dinsdag 17 januari 2006 22:00 schreef Againzender het volgende:
Nou, het begin ga ik missen
_{vrouw kijkt Grey's anatomy}

quote:

ANCHORAGE, Alaska, Jan 17 (Reuters) - A volcano on an uninhabited island off the coast of Alaska erupted again on Tuesday, shooting ash miles (km) into the air, a scientist at the Alaska Volcano Observatory said.

The eruption from the Augustine volcano, which is about 175 miles (280 km) southwest of Anchorage, sent a cloud of ash 8.5 miles (13.7 km) above sea level. It was the ninth eruption since the volcano rumbled to life last week.

quote:

Op donderdag 19 januari 2006 02:16 schreef Godshand het volgende:
Even een vraagje: waar haalt de aarde de energie vandaan om al dat magma en de kern etc. zo heet en vloeibaar te houden? is er kernfusie ofzo in de kern?

quote:

Op donderdag 19 januari 2006 02:16 schreef Godshand het volgende:
Even een vraagje: waar haalt de aarde de energie vandaan om al dat magma en de kern etc. zo heet en vloeibaar te houden? is er kernfusie ofzo in de kern?

quote:

ANCHORAGE, Alaska (Reuters) - After 10 days of relative calm, Alaska's Augustine Volcano roared back to life late on Friday, shooting a cloud of ash 40,000 feet into the sky.

It was the 10th explosion since January 11, when the 4,134-foot (1,260-meter) volcano in southern Cook Inlet began an eruptive phase, reported the Alaska Volcano Observatory, a joint federal-state office

quote:

Op dinsdag 7 februari 2006 12:27 schreef Keileweg-ethicus het volgende:
Jezus jongens, ga eerst het Nederlands eens beheersen, en daarna je bezig houden met vulkanen.

Vulkanen zijn mooi.

quote:

The Mayon volcano in Albay Tuesday spewed ash, noting an increased seismic activity in the area.

The Philippine Institute of Volcanology and Seismology reported the minor ash explosion at 9:41 a.m., the ash column rising at 500 meters and drifting southwest.

Renato Solidum, PHIVOLCS director, said that ash deposits from the explosion were limited to the upper slopes.

Simultaneously, a small explosion-type earthquake shook nearby areas but its intensity was only recognizable by seismographs around the volcano.

Solidum said they expect similar ash explosions in the coming days with magma entering the summit area and releasing volcanic gases.

Before the ash explosion, the PHIVOLCS also recorded 147 low frequency volcanic earthquakes starting at 3:45 p.m. on February 20 until 5:20 a.m. yesterday.

Solidum said the recurrence of earthquakes was unusual as the normal earthquake ranges from zero to five tremors.

"These low frequency volcanic earthquakes were relatively large in amplitude compared with previous seismicity and are interpreted to be caused by the shallow movement of magma within the summit crater," he said.

The PHIVOLCS maintains the alert level-2 status at Mayon Volcano reminding the public to stay away from the six-kilometer permanent danger zone and to avoid major river channels that come from the volcano.

quote:

Pulse reveals beating heart of a supervolcano
01 March 2006
From New Scientist Print Edition
Jessica Marshall

"I DON'T think visitors appreciate that they're standing directly on top of the largest, most dynamic magmatic system on the planet," says geologist Daniel Dzurisin. While the supervolcano that is Yellowstone National Park won't be erupting any time soon, he and his colleagues have uncovered a surprising source of volcanic activity beneath tourists' feet, which was probably the reason trails had to be closed in 2003.

The Yellowstone caldera formed 640,000 years ago in an explosion of magma more than 1000 times greater than the Mount St Helens eruption in 1980. While it is common knowledge that the caldera floor rises and falls, the source of the motion remains uncertain. According to a previous popular theory, the accumulation and release of fluid not far beneath the surface is driving the cycles, but Dzurisin, of the David A. Johnston Cascades Volcano Observatory in Vancouver, Washington, and his colleagues say a deeper source best explains their latest findings.

The team, led by Charles Wicks of the US Geological Survey in Menlo Park, California, used a series of satellite measurements to determine the fluctuations in elevation - up to 120 millimetres - over a seven-year period.

Although the floor of the caldera began subsiding in 1997, the researchers uncovered a new region of activity beneath the north rim of the caldera that continued to swell from 1995 until 2002. Models incorporating the measurements indicate that the source of the upward push was 10 to 16 kilometres beneath the surface in the basaltic magma layer, well below the level of the fluid suggested as the source of the motion (Nature, vol 440, p 72).

The picture is one of magma flow driving the undulation of the surface, flowing upward from beneath the caldera floor towards the northern rim and then down and out from beneath the rim. Seismic activity near the exit acts as a valve, suggests Wicks, blocking or releasing the magma outflow. This explains why the rim and floor can swell and sink at different times.

The idea also explains the rise in thermal activity in the rim area in 2003, Wicks says, when some trails had to be closed because of increased steam releases and a rise in surface temperatures. The swelling magma could have cracked the crust, creating new avenues for steam to escape to the surface, he says.