Sun and Moon Trigger Deep Tremors on San Andreas Fault

Daily Scientist ^ | Dec 25 2009 | Daily Scientist

[PAR35]

suggesting that the rock 15 miles below is lubricated with highly pressurized water

Could be oil. If California would drill and pump much more aggressively, they might cut down on earthquake damage.

[dr_lew]

"When shear stress on a plane parallel to the San Andreas Fault most encourages slipping in its normal slip direction is when we see the maximum tremor rate," Bürgmann said. "The stress is many, many orders of magnitude less than the pressure down there, which was really, really surprising. You essentially could push it with your hand and it would move."

This is misleading. They give the figure of 1/1000 atm. for the shear stress, and this is .015 lb/in2, or 1.5 lb/ 100 in2. So imagine gently pushing a 10" X 10" board sideways with your hand.

The misleading thing is that this gentle force acts on every such 10" X 10" area over hundreds of square miles in the region, and the total shearing force over the region is the sum of these gentle forces.

The tidal potential is in the form of a raised bulge of a few feet which moves around as the earth turns. As it passes by, the local reference for a horizontal, or level, surface tilts very gently on way and then another. Of course, the oceans respond to this by sloshing within the confines of the ocean basin. Here, they're saying that the rock slides back and forth in similar fashion, much to their surprise.

[I see my hands]

Brugmansian

Mary, Mary, come with me. On a hill we'll take some tea and watch LA fall in the sea.

[Brugmansian]

The misleading thing is that this gentle force acts on every such 10" X 10" area over hundreds of square miles in the region, and the total shearing force over the region is the sum of these gentle forces.

Nice addition. I get it too. Or think I do Like suggesting because I can easily push a plank around a pond, I can swim up to the USS Constitution and push it out of Boston harbor?

[exnavy]

If any of them have two brain cells left between them, they are shaken’ in da boots!

[dr_lew]

Yeah. It’s kind of a “place to stand” issue. If you could position thousands of people on some kind of rack above the carrier so that they could reach down and push on it, then they might be able to move it with their collective effort.

[lonestar]

Oh ridigulous, man and man only affects the climate, ask Al Gore (By the way, he also invented the internet...and fire too!)

Don't forget Al invented the wheel.

[montag813]

"OTISBURG?"

[mikrofon]

The possibility that tidal tectonic effects could spur eruptions which release greenhouse gases into the atmosphere and thus add another complication into the climate equation wouldn’t faze these “experts” who have the “science” all pinned down....

[Moltke]

Clearly, we need to get the earth further away from the disruptive influences of the sun and the moon.

Al Gore, get on it already, will ya?

[happinesswithoutpeace]

lawl

[Right Wing Assault]

Years ago, didn’t they laugh at people who claimed the sun and moon influenced earthquakes?

When I was little, 4th grade, I mentioned to the teacher that it looked as if S. America fit right into Africa and I wondered if they had ever been connected. Ha,ha. Years later, I read about a guy called Wegener.

[zot]

Thass Okay, ‘bama’ll make it stop. /sarc

[norton]

After that ordeal, you will move on to Anchorage.
Where all the emergency housing will already have been gobbled up by refugee polar bears.

[SunkenCiv]

Thanks KoRn.

http://www.freerepublic.com/focus/chat/2414104/posts
http://www.freerepublic.com/focus/chat/2415413/posts

[SunkenCiv]

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[SunkenCiv]

• Sun, moon trigger San Andreas tremors: study
• Sun and moon 'set off deep tremors on San Andreas fault'