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Old 22-October-2004, 05:39 PM
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Default Tides can trigger earthquakes
One for HUb'?:

Strong Earth Tides Can Trigger Earthquakes, UCLA Scientists Report

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Earthquakes can be triggered by the Earth's tides, UCLA scientists confirmed Oct. 21 in Science Express, the online journal of Science. Earth tides are produced by the gravitational pull of the moon and the sun on the Earth, causing the ocean's waters to slosh, which in turn raise and lower stress on faults roughly twice a day. Scientists have wondered about the effects of Earth tides for more than 100 years. (The research will be published in the print version of Science in November.)

"Large tides have a significant effect in triggering earthquakes," said Elizabeth Cochran, a UCLA graduate student in Earth and space sciences and lead author of the Science paper. "The earthquakes would have happened anyway, but they can be pushed sooner or later by the stress fluctuations of the tides."
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Old 22-October-2004, 05:47 PM
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Bah... they have been talking about this on "Coast to Coast AM" for quite some time now. At least ayear
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Old 23-October-2004, 12:26 AM
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Originally Posted by samseed
they have been talking about this on "Coast to Coast AM" for quite some time now.
Wrongly, though.

Quakes linked to high tides

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The news is good and bad for James Berkland, Santa Clara County's former staff geologist who claims he can predict earthquakes based on tides and runaway pets.
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But the connection does not work the way Berkland thought. A separate analysis found no more quakes during his predicted "seismic windows'' than would be expected from chance alone.
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Old 23-October-2004, 12:52 AM
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I don't know about the tidal connection but I can see a low pressure system coming on my seismograph a day away. I have had a seismograph I built in my basement since the eighties and when the pressure drops the microseisms really pick up strength. There is a relation between the overlying weight on the Earth and seismic activity, at least at the microseism level.
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Old 23-October-2004, 02:31 AM
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I thought it looked like there often were earthquakes near the low pressure areas of typhoons and hurricanes. Usually they were small enough that the overwhelming disaster effects were from the storm, not the earthquake. I never did a statistical analysis.
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Old 23-October-2004, 11:42 AM
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Originally Posted by Evan
I don't know about the tidal connection but I can see a low pressure system coming on my seismograph a day away. I have had a seismograph I built in my basement since the eighties and when the pressure drops the microseisms really pick up strength. There is a relation between the overlying weight on the Earth and seismic activity, at least at the microseism level.
Everyone is running to get out of the rain.
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Old 23-October-2004, 05:20 PM
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Ha. ha.

In a really strong weather system like a typhoon or hurricane the pressure can drop by two inches of mercury in a short time. That is around 1 pound per square inch. Or, ~690 kilos per sq meter. Or, 690,000,000 kilos per sq kilometer. Or 69,000,000,000 tonnes per 100km^2. Gotta make a difference.
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Old 23-October-2004, 06:11 PM
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Originally Posted by Evan
In a really strong weather system like a typhoon or hurricane the pressure can drop by two inches of mercury in a short time. That is around 1 pound per square inch. Or, ~690 kilos per sq meter. Or, 690,000,000 kilos per sq kilometer. Or 69,000,000,000 tonnes per 100km^2. Gotta make a difference.
I seem to recall some studies published ten years ago that showed that relationship. I'll see if I can dig them out.
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Old 24-October-2004, 07:50 AM
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Series of Earthquakes Strike Japan

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Originally Posted by MSNBC
The quakes — the most powerful recorded as magnitude-6.8 — were spread over several hours and centered on Ojiya, about 160 miles northwest of Tokyo. Still, buildings swayed in the Japanese capital.
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