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The ground in the Puget Sound region didn't just shake during the magnitude 6.8 Nisqually earthquake, it moved -- literally.
"Not only that, but it moved in completely the opposite direction of what we've observed from year to year," said Anthony Qamar, a University of Washington research associate professor in Earth and space sciences and the state seismologist.
PANGA's measurements have shown that typically the central Puget Sound region moves to the east-northeast at about 3 to 5 millimeters per year. By contrast, at Neah Bay on the state's northwest coast the movement is about 10 millimeters, or a half-inch, per year. That's because the coast is much closer to the zone where the Juan de Fuca plate dives beneath the North American Plate, and the pressure moving the land surface is much greater than farther inland.
In the Nisqually earthquake, GPS sensors showed a Coast Guard station at Point Robinson on the east edge of Maury Island moved 8 millimeters to the south-southwest and the UW campus moved 5 millimeters -- about two-tenths of an inch -- south-southwest. The data showed that Satsop, which is about midway between the epicenter and the Washington coast, moved west about 6 millimeters and Pacific Beach, on the coast, moved northwest about 4 millimeters.
Though currently there are no measurements, Qamar also expects that data eventually will show that areas west of the earthquake's focus deep beneath the Nisqually River delta north of Olympia rose as much as a half-inch in the quake. He expects that areas to the east will have dropped about one-third of an inch. (An earthquake's epicenter is the area on the surface that lies directly above the hypocenter, or focus.)
The actual movement of the fault at the focus of the earthquake was probably about 1 meter, more than 3 feet, Qamar said. But the fact that the focus was some 34 miles deep in the Earth means the displacement at the surface is far less.
Originally posted by beforebc
They say that oceanic crust subducts at the continental margins. How does rock sink into rock! And isn't the outside layer of a sphere larger in volume than anything that lays below? So where's all the room coming from to allow this (subduction) to happen? And where in all this wide world is there one single example of this type of (rock sinking into rock) out in the open so's we can see it?
They say that up-flowing magma at the mid-ocean ridges is forcing the continental plates apart! Last time I looked those continental plates were thousands of miles wide .. so how does this (up-flowing magma) that has no resistance to flowing upward and onto the ocean floor .. suddenly get the expansion capability to push huge blocks of ocean crust?
One last point: Structural foundations in all nations around the world, are designed on the established knowledge that compression forces [hence their associated compression stresses] are dissipated through shear by a leading "compression cone!" So my question is this:
"How is it then that tectonics is able to push up mountains in apparent defiance to this well established physical principle?"
tectonics is pure nonsense and we need to think of our children first .. and get it out of our schools
[edit on 23-4-2006 by beforebc]
Originally posted by beforebc
bigx01 - what you're posting is simple orthodox "Descriptive Jargon!"
PANGA's measurements have shown that typically the central Puget Sound region moves to the east-northeast at about 3 to 5 millimeters per year. By contrast, at Neah Bay on the state's northwest coast the movement is about 10 millimeters, or a half-inch, per year. That's because the coast is much closer to the zone where the Juan de Fuca plate dives beneath the North American Plate, and the pressure moving the land surface is much greater than farther inland.
In the Nisqually earthquake, GPS sensors showed a Coast Guard station at Point Robinson on the east edge of Maury Island moved 8 millimeters to the south-southwest and the UW campus moved 5 millimeters -- about two-tenths of an inch -- south-southwest. The data showed that Satsop, which is about midway between the epicenter and the Washington coast, moved west about 6 millimeters and Pacific Beach, on the coast, moved northwest about 4 millimeters.
Though currently there are no measurements, Qamar also expects that data eventually will show that areas west of the earthquake's focus deep beneath the Nisqually River delta north of Olympia rose as much as a half-inch in the quake. He expects that areas to the east will have dropped about one-third of an inch. (An earthquake's epicenter is the area on the surface that lies directly above the hypocenter, or focus.)
The actual movement of the fault at the focus of the earthquake was probably about 1 meter, more than 3 feet, Qamar said. But the fact that the focus was some 34 miles deep in the Earth means the displacement at the surface is far less.
Originally posted by whaaa
Im not sure about this but I think beforebc has a biblical
fundamental ax to grind here.
First of all spacedoubt, you're right! There is a mechanism that is making the mountains grow- and it's NOT tectonics!
a body in motion will follow a straight line unless acted upon by an external force
Originally posted by beforebc
what you're posting is simple orthodox "Descriptive Jargon!"
-- While this is Descriptive Jargon:
* The Earth's surface is covered ..
* The ocean floors are continually moving ..
* Convection currents ..
* The source of heat ..
* Subduction
* Continental drift
-- tectonics is in a different Universe! NO physical principles - No mathematical formulations, NO verifiable engine or driving forces. Just old fashion (on and on) forever - "Descriptive Jargon!"
bc.
.
This radar interferogram shows a pattern of ground uplift centered about 3 miles (5 km) west of South Sister volcano in central Oregon. Each full color band from blue to red represents about 2.8 cm (slightly more than 1 inch) of ground movement in the direction of the radar satellite. In this case, four concentric color bands show that the surface moved toward the satellite (mostly upward) by as much as 10 cm (about 4 inches) sometime between August 1996 and October 2000. No information is available for uncolored areas, where forest vegetation or other factors hinder the acquisition of useful radar data. A numerical model places the source of the uplift about 4 miles (7 km) beneath the ground surface. The most likely cause is magma accumulation in the Earth's crust, a process that has been observed with radar interferometry at several other volcanoes worldwide. There is no immediate danger of a volcanic eruption or other hazardous activity. The U.S. Geological Survey, in cooperation with the U.S. Forest Service, is analyzing additional information and installing new monitoring instruments to determine if the uplift is continuing. The interferogram was produced by Wicks and others (2001) using radar images from the European Space Agency's ERS satellites.
Originally posted by beforebc
t
The alternative you're looking for is what I've coined "the RB-Effect." The concept is that geo-physical forces are those that hold the earth in solar orbit! Planets don't orbit .. because that's what planets do! --- Planets orbit because they are forced to by gravitational attraction. Left on their own they'd go straight out into deep space in accordance with Newton's First Law.
Each part of the Earth responds to these orbital-gravitational forces in a different way. The iron core, for instance, is massive in comparison to earth's rocky interior .. and the presence of a surrounding molten layer gives the core a degree of freedom of it's own.
So as solar-gravitational forces cause the earth into curvilinear-orbital motion .. The independence of the core causes it to lag a bit.
Hence a unique rotational rate of it's own. This was discussed in a 1996 article by William J. Broad reports :: "Earth’s Core, a Planet Within the Planet, Is Spun by Twin Streams of Molten Iron," The New York Times, Tue, Dec. 17, 1996, Pg. C1
We can see immediately that it's NOT -- "Twin Streams of Molten Iron," that causes the core to rotate on it's own .. it's Newton's First Law.
Originally posted by beforebc
but since when can heat drive anything except by thermal expansion?
Once the material has expanded, there's no more movement .. it's over - done!
How does rock sink into rock!
so how does this (up-flowing magma) that has no resistance to flowing upward and onto the ocean floor .. suddenly get the expansion capability to push huge blocks of ocean crust?
How is it then that tectonics is able to push up mountains in apparent defiance to this well established physical principle
You ask "How does anything sink?" .. easy it follows Archimedes principle .. but recall that the object must be freely suspended in the medium. But unfortunately that rock you want to sink into other rock .. is attached to 3000 miles of ocean basin!