Jack777
February 10th 2005, 02:16 PM
I thought I would post this to answer Lion's question since edit time ran out, dang...
It is true that messing with the hydrodynamics of a reservoir can trigger movement of structural lineaments. I usually think of the results in Colorado. There are other reasons for things moving about in addition. I did not want to put down here anything about geomagnetic influences on this kind of thing as it is tough to prove and anecdotal as a rule, but there is also circumstantial evidence. Anyway, here you go about the effect on the polar axis by the earthquake.
For a global perspective, consider...
http://story.news.yahoo.com/news?tmpl=story&cid=570&ncid=753&e=2&u=/nm/20041229/sc_nm/quake_usa_earth_dc (http://story.news.yahoo.com/news?tmpl=story&cid=570&ncid=753&e=2&u=/nm/20041229/sc_nm/quake_usa_earth_dc)
Science - Reuters
Quake May Have Made Earth Wobble--US Scientists
Tue Dec 28, 8:20 PM ET Science - Reuters
LOS ANGELES (Reuters) - The deadly Asian earthquake may have permanently accelerated the Earth's rotation -- shortening days by a fraction of a second -- and caused the planet to wobble on its axis, U.S. scientists said on Tuesday.
Richard Gross, a geophysicist with NASA (news - web sites)'s Jet Propulsion Laboratory in California, theorized that a shift of mass toward the Earth's center during the quake on Sunday caused the planet to spin 3 microseconds, or 3 millionths of a second, faster and to tilt about an inch on its axis.
When one huge tectonic plate beneath the Indian Ocean was forced below the edge of another "it had the effect of making the Earth more compact and spinning faster," Gross said. Gross said changes predicted by his model probably are too minuscule to be detected by a global positioning satellite network that routinely measures changes in Earth's spin, but said the data may reveal a slight wobble.
The Earth's poles travel a circular path that normally varies by about 33 feet, so an added wobble of an inch is unlikely to cause long-term effects, he said. "That continual motion is just used to changing," Gross said. "The rotation is not actually that precise. The Earth does slow down and change its rate of rotation."
When those tiny variations accumulate, planetary scientists must add a "leap second" to the end of a year, something that has not been done in many years, Gross said. Scientists have long theorized that changes on the Earth's surface such as tide and groundwater shifts and weather could affect its spin but they have not had precise measurements to prove it, Caltech seismologist Hiroo Kanamori said.
"Even for a very large event, the effect is very small," Kanamori said. "It's very difficult to change the rotation rate substantially."
http://forums.lycaeum.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=9&t=000687 (http://forums.lycaeum.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=9&t=000687)
These pages contain source material whether you agree with their conclusions about things or not. I would disagree with some things, but they do present some ideas and data.
See: http://standeyo.com/index1.html (http://standeyo.com/index1.html)
See: http://www.barry.warmkessel.com/barry/SynopsisComet.html (http://www.barry.warmkessel.com/barry/SynopsisComet.html)
It is true that messing with the hydrodynamics of a reservoir can trigger movement of structural lineaments. I usually think of the results in Colorado. There are other reasons for things moving about in addition. I did not want to put down here anything about geomagnetic influences on this kind of thing as it is tough to prove and anecdotal as a rule, but there is also circumstantial evidence. Anyway, here you go about the effect on the polar axis by the earthquake.
For a global perspective, consider...
http://story.news.yahoo.com/news?tmpl=story&cid=570&ncid=753&e=2&u=/nm/20041229/sc_nm/quake_usa_earth_dc (http://story.news.yahoo.com/news?tmpl=story&cid=570&ncid=753&e=2&u=/nm/20041229/sc_nm/quake_usa_earth_dc)
Science - Reuters
Quake May Have Made Earth Wobble--US Scientists
Tue Dec 28, 8:20 PM ET Science - Reuters
LOS ANGELES (Reuters) - The deadly Asian earthquake may have permanently accelerated the Earth's rotation -- shortening days by a fraction of a second -- and caused the planet to wobble on its axis, U.S. scientists said on Tuesday.
Richard Gross, a geophysicist with NASA (news - web sites)'s Jet Propulsion Laboratory in California, theorized that a shift of mass toward the Earth's center during the quake on Sunday caused the planet to spin 3 microseconds, or 3 millionths of a second, faster and to tilt about an inch on its axis.
When one huge tectonic plate beneath the Indian Ocean was forced below the edge of another "it had the effect of making the Earth more compact and spinning faster," Gross said. Gross said changes predicted by his model probably are too minuscule to be detected by a global positioning satellite network that routinely measures changes in Earth's spin, but said the data may reveal a slight wobble.
The Earth's poles travel a circular path that normally varies by about 33 feet, so an added wobble of an inch is unlikely to cause long-term effects, he said. "That continual motion is just used to changing," Gross said. "The rotation is not actually that precise. The Earth does slow down and change its rate of rotation."
When those tiny variations accumulate, planetary scientists must add a "leap second" to the end of a year, something that has not been done in many years, Gross said. Scientists have long theorized that changes on the Earth's surface such as tide and groundwater shifts and weather could affect its spin but they have not had precise measurements to prove it, Caltech seismologist Hiroo Kanamori said.
"Even for a very large event, the effect is very small," Kanamori said. "It's very difficult to change the rotation rate substantially."
http://forums.lycaeum.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=9&t=000687 (http://forums.lycaeum.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=9&t=000687)
These pages contain source material whether you agree with their conclusions about things or not. I would disagree with some things, but they do present some ideas and data.
See: http://standeyo.com/index1.html (http://standeyo.com/index1.html)
See: http://www.barry.warmkessel.com/barry/SynopsisComet.html (http://www.barry.warmkessel.com/barry/SynopsisComet.html)