So anyone here from Alaska? This is the first I've heard of it. I thought there would be earthquakes. :shrug: It doesn't seem to be on the scale of Mt St Helenes. Mount Redoubt, the Alaskan volcano expected to erupt at any time, is getting a bit more edgy. The Alaska Volcano Observatory said in a statement Friday "volcanic tremor" has increased in "amplitude." The activity on the 10,197-foot peak is "more energetic than that of the previous several days. However, it is still less vigorous than that observed last weekend," the observatory said. Peter Cervelli, a research geophysicist with the observatory, told CNN that "every indication is that we're heading toward an eruption." Cervelli said scientists don't know exactly when it will happen, but if it does happen, it could be days or weeks -- or even hours. "I would not be surprised to see it erupt at anytime," Cervelli said. "We're going to know it when we see it." Learn more about Redoubt and its history ยป Scientists raised the alert status Sunday to a "watch" level, the second-highest, based on seismic activity detected January 23. The peak is about 100 miles southwest of Anchorage, the state's most populous city. Mount Redoubt last erupted nearly 20 years ago, in December 1989, and that eruption lasted until April 1990. Geologists think there could be an eruption "similar to or smaller than the one that occurred in 1989-90." ....
Please Register or Log in to view the hidden image! http://en.wikipedia.org/wiki/Good_Friday_Earthquake This is Anchorage after the Great Alaska earthquake, that struck on Friday, March 27, 1964. It was the most powerful recorded earthquake in U.S. and North American history, measured at 9.2. I've heard this crack or fault in the "Pacific ring of fire" goes all the way down to and includes the San Andreas fault. This could have been part of a long chain of events that causes the sinking of the entire Pacific shelf under California when the anticipated "Big One" strikes. I wonder if current activity in Alaska's volcanoes could be a sign of a significant event about to happen in California? The University of California study on "the next big one" A study completed by Yuri Fialko, has demonstrated that the San Andreas fault has been stressed to a level sufficient for the next "big one," as it is commonly called. The study also concluded that the risk of a large earthquake may be increasing faster than researchers had previously believed. Fialko also emphasized in his study that, while the San Andreas Fault had experienced massive earthquakes in 1857 at its central section and in 1906 at its northern segment (the great San Francisco earthquake), the southern section of the fault has not seen a similar rupture in at least 300 years. If such an earthquake were to occur...such an event would be felt throughout much of Southern California, i ncluding densely populated areas of metropolitan Los Angeles, Orange County, San Diego and Tijuana, Baja California.
I don't know about that. These uploaded pics are really messing with the screen size. Are you having a display sync problem on your computer? Sorry about that if you are.
No, many of them are active. Currently, 2 volcanoes in the Aleutian islands are in a state of unrest, (plus Redoubt which not part of those the islands) and several others have erupted in the last couple of years. The following website usually has a great deal of information on them, but it is currently limited because of the amount of use due to Redoubt. http://www.avo.alaska.edu/ Wikipedia also has a good write-up about them. Purveyor of BOOM!
Many of them are active, actually. There was a recent evacuation of one island, as it had an erupting volcano on it. They've got hot springs out there, too. I remember the '89 eruption. It went off shortly after we moved back to Alaska from California. It was a cold, gray fall, made worse by all the ash coming down. I was five. Playing in that stuff made my hands hurt. There was a layer of ash in the soil for seveeral years after that. Probably still is; I just haven't been mucking about in puddles like I was when I was a kid.
Why? Was it the texture of teh ash or what it was chemically composed of. I guess I'm asking if it burned your skin or if it abraded your skin.
Pumice is a textural term for a volcanic rock that is a solidified frothy lava typically created when super-heated, highly pressurized rock is violently ejected from a volcano. This unusual formation is due to the simultaneous actions of rapid cooling and rapid depressurization. The depressurization creates bubbles by lowering the boiling point of the lava (akin to the bubble-creation when a carbonated drink is opened). The simultaneous cooling then freezes the bubbles in the matrix. Pumice is composed of highly microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock. It is commonly, but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte), but basaltic and other compositions are known. Pumice is commonly pale in color, ranging from white, cream, blue or grey, to green-brown or black. It forms when gases exsolving from viscous magma nucleate bubbles which cannot readily decouple from the viscous magma prior to chilling to glass. Pumice is a common product of explosive eruptions (plinian and ignimbrite-forming) and commonly forms zones in upper parts of silicic lavas. Pumice has an average porosity of 90%, and initially floats on water. http://en.wikipedia.org/wiki/Pumice
so if you breath ash long term, what parts of your body does it affect? I would think it would hurt more than just your lungs. And pumice is microvesiclar glass? I use a pumice stone on my feet. Should I quit??
Nah, it's all about size and shape. Just like a beer bottle is safe to use until it breaks, your pumice is ok until it gets blown up in a volcano into bits less than 2mm in diameter. Technically, ash isn't just silica dioxide. I'm no geologist, so I can't tell you what's in it for sure, but wiki tells me that ash is just magma that has been blown out of a volcano an solidified in the air. I think it was once explained to me like cotton candy- the magma is the molten sugar, and by blowing it into the atmosphere, it cools and forms tiny crystal particles.
December 14, 1989 Redoubt EruptionPlease Register or Log in to view the hidden image! Look at the similarities here! French Nuclear Test ExplosionPlease Register or Log in to view the hidden image! Alaskans brace for another Redoubt Volcano eruption ANCHORAGE, Alaska. - Volcanic activity is picking up at Alaska's Mount Redoubt, and that has meant an increase in business for hardware stores and auto parts shops in south-central Alaska.
If they could bore a tunnel with a large boring machine into the side of it they could releive the pressure by letting some of the magma escape through that tunnel and prevent an eruption.
I was looking for a picture of a bomb blast that showed similar cloud rings to the eruption photo... Heres another one. That much heat released into the atmosphere creates this effect. Ivy Mike U.S. test - Please Register or Log in to view the hidden image! 1989 Redoubt Eruption - Please Register or Log in to view the hidden image!
