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#159147 - 10/04/04 07:20 PM
Re: Volcano Thread
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Backstop
Member
Registered: 01/17/04
Posts: 2332
Loc: Texas
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Thanks, Mal.
I just finished searching:
http://wrgis.wr.usgs.gov/fact-sheet/fs036-00/
quote:
Summary of May 18, 1980 Eruption of Mount St. Helens
Volcano
Elevation of summit 9,677 feet before; 8,363 feet after; 1,314 feet removed Volume removed* 0.67 cubic miles (3.7 billion cubic yards)
Crater dimensions 1.2 miles (east-west); 1.8 miles (north-south); 2,084 feet deep Crater floor elevation 6,279 feet
Landslide Area and volume* 23 square miles; 0.67 cubic miles (3.7 billion cubic yards)
Depth of deposit Buried 14 miles of North Fork Toutle River Valley to an average depth of 150 feet (max. depth 600 feet)
Velocity 70 to 150 miles per hour
Lateral Blast Area covered 230 square miles; reached 17 miles northwest of the crater
Volume of deposit* 0.046 cubic miles (250 million cubic yards)
Depth of deposit From about 3 feet at volcano to less than 1 inch at blast edge Velocity At least 300 miles per hour
Temperature As high as 660° F (350° C)
Energy released 24 megatons thermal energy (7 by blast, rest through release of heat)
Trees blown down 4 billion board feet of timber (enough to build about 300,000 two-bedroom homes)
Holy cow!
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#159148 - 10/05/04 04:07 AM
Re: Volcano Thread
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INVICTUS
Member
Registered: 03/29/04
Posts: 3112
Loc: USA
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quote:
Originally posted by Backstop:
Mal (et al),
In your photo, do you know how far it is across that crater?
If you know off the top of your head, great. If not, I'll search.
Thanks.
Baclstop...
I viewed it from the Johnstop Observatoy which is about 5 miles distant... here is the same view I saw four years ago
A view of Mount St. Helens from the Johnston Ridge Observatory. Forest Service photograph by D. Lapcewich
HOW BIG IS THAT CRATER???
LET THIS COMPARISON OF JUST THE LAVA DOME BE YOUR GUIDE!!!
NOTE THAT IN 1983 THE LAVA DOME ALONE WAS 1/2 MILE WIDE
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#159150 - 10/05/04 09:21 AM
Re: Volcano Thread
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INVICTUS
Member
Registered: 03/29/04
Posts: 3112
Loc: USA
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Check the live cam... Mount St.Helens is erupting right now.
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#159152 - 10/08/04 09:24 AM
Re: Volcano Thread
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INVICTUS
Member
Registered: 03/29/04
Posts: 3112
Loc: USA
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Seems as if the entire 'Ring of Fire' is acting up these days.
Most of the US and Canadian Pacific NW volcanos are showing signs of increased seismic activity.
Mount St. Helens can still blow unexpectedly. Keep an eye on Mt. Ranier and Mt. Adams. Yellowstone super-volcano is not to be forgotten.
In rapid succession within the past 24 hours we've seen major earthquakes moving North-to-South along the western Pacific part ofthe "Ring"
a 6+ richter on Japan (Hokkaido) yesterday
a 6+ richter in Manilla, Philipines today
a 6.8 richter in the Solomon Islands today.
Yikes!
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#159154 - 11/29/04 09:47 AM
Re: Volcano Thread
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Rick Donaldson
Time Traveler
Senior Investigator
Registered: 05/04/01
Posts: 6985
Loc: Colorado Springs
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Big eruption of New Guinea volcano possible
Space Daily ^ | 11/28/2004 | Agence France-Presse
Evacuation Of Volcano-Hit Papua New Guinea Island Gets Underway
Port Moresby, PNG (AFP) Nov 28, 2004
An urgent evacuation of around 9,000 villagers from Papua New Guinea's remote Manam Island got underway Sunday amid fears the the island's volcano was on the verge of a major eruption, officials said.
The first batch of hundreds of islanders were taken off the island by container boat in the morning, an official coordinating the evacuation told AFP from the remote community of Bogia, where the islanders are to be taken.
"It is on its way to Bogia," disaster relief official John Bivi said, when asked about the boat's progress. He said the islanders were in relatively good shape despite the lack of food.
"Some of the food gardens and cash crops, trees and houses have been destroyed," he said. "There is no food and even water."
The first boatload was expected to complete the two-hour trip to Bogia by late afternoon.
Clouds of ash spewing from the cone of Manam Volcano, with plumes rising up to 10 kilometres (six miles) above the summit, have left ash raining back down on the fertile island for nearly a week.
Officials have blamed contaminated water for two deaths, although this was denied by Bivi who said nobody had died so far but there had been several injuries.
The mass evacuation could take up to a week and will require more than 20 trips by the container vessel, which has a capacity of around 600 people.
The evacuation was originally planned to begin on Saturday, but delays in bringing the ship from Port Moresby meant it only arrived in the regional centre of Madang late in the day.
Officials at the Rabaul Volcano Observatory, which has sent an observer to Manam to monitor the situation, said Sunday the levels of activity within the volcano were still rising.
From Madang, disaster relief official Luke Kalaua said the situation could worsen and that islanders could be at risk if they stayed.
"That means there is a possibility that it will go into a major eruption," he said.
Land has been prepared for the islanders near Bogia on a former coconut and cocoa plantation and the government expects to feed the evacuees for at least six months.
The eruption began last month but resumed with a vengeance a week ago, leaving the subsistence farmers and fishermen malnourished and short of clean water.
The island has no telephone service and relies on radio for contact with the outside world, and the poor communications have been worsened by the ash, which has rendered solar panels to generate electricity useless.
It remains unclear whether the islanders will be able to return to Manam.
It is not the first time the island has been evacuated. Its long history of volcanic eruptions has required similar evacuations in the past but the fertile soil and strong ties have always lured the islanders back.
However, traditional leaders have firmly backed the latest evacuation as there is little alternative.
Manam last erupted in 1996, when a lava flow hit a village and killed several people.
PNG contains a large number of volcanoes as it lies at the junction of two tectonic plates on the earth's surface.
_________________________
Ad astra per aspera
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