Tribe.net. Local Connections Rhino http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#1108b6a8-c2ce-414a-b2d3-db56582c4f8f 2008-12-31T22:32:22Z 2008-12-31T22:32:22Z

The pressure of the curve in the spin of the earth is smaller than what it takes. What causes the magma to erupt upwards is convection currents of molten material in the mantle of the earth that are pushing up after becoming both superpressurized and superheated. They're in a plastic/liquid state in the mantle, and get pushed up, where they find fault lines, crustal weaknesses, and other weakenesses in the earth's crust, exploit those weaknesses by pushing into them, and push upward and out as lava. It's a process that can take hundreds of thousands of years. We're honored to give you a hand, Plokk. The professionals and rockhounds both love to talk about the wonder and beauty of the earth. That's why the rockhounds and professionals are usually pretty good friends.

Rhino 2008-12-31T22:32:22Z Plokk D Rainbo http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#0d806d5c-0778-471b-b5fa-51ad19bdca47 2008-12-31T22:20:50Z 2008-12-31T22:20:50Z

Thank you for the link.... the author says to note the curvature of the earth.. yet doesn't explain... given the rest of the article and that Hawaii is at the end of the chain and closest to the curve I was wondering if they were considering that the pressure of the curve in the spin of the earth causes the magma to push _________ plate out of the way and erupt....or I may be way off lol in which case tell me to go read some more.. and yes thank you for helping me along.

Plokk D Rainbo 2008-12-31T22:20:50Z Rhino http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#a153d2a1-4c09-4609-b30a-d8bcd8adce2b 2008-12-31T21:09:45Z 2008-12-31T21:09:45Z

Exactly right, Will. The structural articulations in the crust that absorb or disperse seismic energy include faults and folds, and lest we forget, the degree to which a quake is felt decreases with the root mean square of distance from the epicenter. On Long Valley's caldera, all I've been able to call up right away is sitting on my desktop. The Continental Consortium for Deep Drilling obtained continuous core from Phase III of the Long Valley Exploratory Well from 7180 to 9831 feet during coring operations there. From that coring operation (USGS Open File Report 99-158, available on CD ROM.) preliminary stratigraphy of the caldera was determined, and the jury is still out on what causes what. The Yellowstone Hot Spot used to be under Idaho. From dating of the volcanic deposits there and from deposits at Ash Fall Fossil Beds in Nebraska, it's been determined that there was a major eruption phase in Idaho which blanketed most of the western states with several meters of ash. Where it hasn't been eroded, it's still visible. In the Eocene epoch of the Tertiary Period it buried the barrel-chested rhinos at Ash Fall- - they're being excavated today. The same species, Teleoceras, is also known from the Miocene Gray fossil site in eastern Tennessee that was found by some out-of-state colleagues of mine. For the sake of providing a little more information...the Hawaiian Islands chain hot spot is further defined by a series of former volcanoes that extend into the subsea....these are called the Emperor seamounts. Good discussion, folks!

Rhino 2008-12-31T21:09:45Z Snowlover http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#a777f01b-d5a1-4e05-822e-9f141234bb07 2008-12-31T20:47:25Z 2008-12-31T20:47:25Z

here's a brief explanation of hot spots from the USGS http://pubs.usgs.gov/gip/dynamic/hotspots.html Just beacuse quakes occur at similar times doesn't necessarily mean they are related.

Snowlover 2008-12-31T20:47:25Z Plokk D Rainbo http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#24e914ae-4edf-4739-8575-93bec1cb9caf 2008-12-31T19:57:55Z 2008-12-31T19:57:55Z

mantle upwelling like a pot of boiling water? the bubble is pushing the bottom of the lake?

Plokk D Rainbo 2008-12-31T19:57:55Z Will The Dancer http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#8ce8cbf7-75d0-47d8-8819-fab106c6596a 2008-12-31T17:48:54Z 2008-12-31T17:48:54Z

Highly unlikely, as there are many structural articulations in the crust that would absorb seismic energy, otherwise, a quake in Indiana would be felt across the continent as if it happened in one's own backyard. Mostly, local events impact local stresses. There are some indications that the 2002 Denali event did trigger some small scale activity in the Long Valley Caldera. Sorry, I do not have the link to the article on tap, but I read it somewhere. Rhino is right on the money about Yellowstone. I have been enjoying some of the spirited debate over the existence of mantle plumes, but I do think that defines Yellowstone, and the Hawaiian chain. BTW Mantle Plume=Hot Spot.

Will The Dancer 2008-12-31T17:48:54Z Plokk D Rainbo http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#391ae1c9-2338-4038-870b-db350de6541c 2008-12-31T17:21:10Z 2008-12-31T17:21:10Z

by hot spot your referring to the underlying magma which helps fuel the geysers ? and now I get the reference to volcanic activity. Ok I'm not a geologist nor do I play one on the internet.. :) I took some basic courses in college as needed for a degree in ornamental horticulture. So I'm familiar with aquifers and some land formations... my grandfather was a rock hound and Rhino suggested I come here.. thanks Rhino... anyway just before the China quakes there was a small event near Evansville Indiana which is what made me question whether the swarm in Yellowstone could be a precursor to a coming event.

Plokk D Rainbo 2008-12-31T17:21:10Z Rhino http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#4cd93ec0-6f0f-4dfb-8d0c-d13fe7138323 2008-12-31T16:10:57Z 2008-12-31T16:10:57Z

My feeling is that the two would occur independent of each other. You see, Yellowstone is a "hot spot", or a continental crust, part of the North American plate, that's overriding a mantle upwelling. These are magmatically induced quakes, whereas the ones at plate boundaries are frictionally induced, when plates meet each other or when they spread apart, or when they slide past each other.

Rhino 2008-12-31T16:10:57Z Plokk D Rainbo http://geologygeeks.tribe.net/thread/880ce283-0944-4585-97e0-e4ad0cf24f6c#009769f8-cf07-472b-8157-809a4cdd9d02 2008-12-31T01:55:29Z 2008-12-31T01:54:06Z

I became interested in watching the earthquake movements when I started looking at Google earth, it shows fault lines and earthquakes then I added the widget on my g mail homepage so I watched the earthquakes build and release in China.. there is still alot of energy around the inner edge of the continents shown here http://neic.usgs.gov/neis/qed/ With the current event (swarm) in Yellowstone , which is in the middle of the continent occurring is it more likely to have a larger event along the faults? to release the pressure? Can you explain if yes or no?

Plokk D Rainbo 2008-12-31T01:54:06Z