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USGS: Some Earthquakes on San Andreas Fault Are Triggered by Gravitational Tug Between Sun and Moon
Los Angeles Times ^ | 07/18/2016 | Rosanna Xia

Posted on 07/18/2016 7:49:56 PM PDT by BenLurkin

Like sea levels, the surface of the Earth also goes up and down with the tides, flexing the crust and stressing the faults inside....

“...[T]he moon, when it's pulling in the same direction that the fault is slipping, causes the fault to slip more – and faster,” said Nicholas van der Elst, a U.S. Geological Survey geophysicist...

...

Like ocean tides, the strongest Earth tides occur when the sun and moon are aligned, and the weakest occur when they are 90 degrees apart. The same gravitational forces stretch and compress the Earth’s crust (though the rock moves less dramatically than seawater).

Some faults are more susceptible to tidal triggering than others, such as offshore faults like the Cascadia subduction zone off the Pacific Northwest coast, scientists said. Other characteristics of the fault, such as its orientation or how close it is to the Earth’s crust, also affect the tidal response. 'Seismic strain': Land around the San Andreas fault is rising and sinking, new earthquake research shows 'Seismic strain': Land around the San Andreas fault is rising and sinking, new earthquake research shows

...

...

They also show that this part of the San Andreas is creeping, or slowly moving, almost all the time....

...

“So if all of a sudden, we saw that the deep part of the fault was slipping a huge amount, it might be an indication that there was an increased chance of having an earthquake come at the shallower part of the fault,” he said.

...

It’s like the fault has an earthquake budget...“If you used them up yesterday, you don’t have as many to trigger today. By actually measuring that, we get an estimate of what that stress budget is.”

Essentially, scientists now have a way to measure the fault’s recharge time in certain locations.

(Excerpt) Read more at latimes.com ...


TOPICS: Science
KEYWORDS: earthquakes; sanandreasfault; sunandmoon; usgs
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1 posted on 07/18/2016 7:49:57 PM PDT by BenLurkin
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To: rdl6989

bookmark for later


2 posted on 07/18/2016 7:52:45 PM PDT by rdl6989
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To: BenLurkin

3 posted on 07/18/2016 7:55:39 PM PDT by sagar
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To: BenLurkin

The only way to resolve this is to have a solar-lunar tax to pay someone to mediate the two celestial bodies. I’ll buy moonbeam credits from Algore against the fact that I have shade trees.


4 posted on 07/18/2016 7:59:14 PM PDT by SERKIT ("Blazing Saddles" explains it all.......)
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To: BenLurkin

Surely someone can be sued for the celestial contest.


5 posted on 07/18/2016 7:59:25 PM PDT by lurk (T)
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To: BenLurkin

This has been known for decades.


6 posted on 07/18/2016 7:59:59 PM PDT by SpaceBar
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To: BenLurkin

The 15-215 interchange — which is built right on top of the fault — is still in redevelopment. I’m wondering if this redevelopment tries to minimize the affects of all this constant movement.


7 posted on 07/18/2016 8:07:27 PM PDT by Vision Thing (hillarhoids says, "I am not a crooked hillary!")
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To: BenLurkin

I’ve been watching this for a couple months.
Right now TODAY, Jupiter, Sun and Mercury are on one side of the Earth.
The Moon, Mars and Saturn are on the other.

A week ago, small quakes started to pop up in CA, NV and WA and the timings seem to indicate they were interrelated.
CA activity has been pretty quiet for the last year other than an occasional 4.x

I’m not predicting anything but it is something worth studying carefully.


8 posted on 07/18/2016 8:13:33 PM PDT by Zathras
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To: Zathras

I know, half the galaxy is on one side and the other half is pulling on the other side.
No wonder my waste has gotten bigger.


9 posted on 07/18/2016 8:15:23 PM PDT by A CA Guy (God Bless America, God Bless and keep safe our fighting men and women.)
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To: BenLurkin

I thought Algore and his loonies said “global warming” was causing it.


10 posted on 07/18/2016 8:15:59 PM PDT by FlingWingFlyer (Let's Make Our Founding Documents Great Again!)
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To: Zathras

It has been scarily quiet in SoCal.


11 posted on 07/18/2016 8:16:54 PM PDT by BenLurkin (The above is not a statement of fact. It is either satire or opinion. Or both.)
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To: BenLurkin

Planet X is getting closer.


12 posted on 07/18/2016 8:16:59 PM PDT by crazydad
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To: SpaceBar

“This has been known for decades.”

You know it and I know it but most scientists have a hard time believing something so obvious. About 40 years ago I learned that the Great Alaska Good Friday Earthquake of 1964 occurred within 4 minutes of the official local time that the Moon was Full. I’ve believed in the connection with geologic events ever since then. It’s only logical.

I have worked in Emergency Medicine for most of my career. I dread working the Full Moon and the few days following. Not sure if its the Moon’s pull on our precious bodily fluids but SOMETHING upsets a whole lot of people.


13 posted on 07/18/2016 8:17:00 PM PDT by 43north (BHO: 50% black, 50% white, 100% red.)
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To: BenLurkin

I thought earthquakes were caused by global warming. S/


14 posted on 07/18/2016 8:17:47 PM PDT by Mark17 (The love of God, how rich and pure, how measureless and strong. It shall forevermore endure.)
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To: BenLurkin

WHAT!!?? You mean it’s NOT global warming?


15 posted on 07/18/2016 8:19:51 PM PDT by grey_whiskers (The opinions are solely those of the author and are subject to change without notice.)
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To: BenLurkin

From page 196 in the book “Darwin’s Ghost”, written by Steve Jones, ... “Fifteen million years ago, life on Earth was much as it is today; but fifteen million years hence, because of the imperceptible creep of coastal California along the San Andreas fault, the Santa Monica Freeway in Los Angeles will run directly into the San Francisco Bay Bridge, as the City of Angels migrates northward.”


16 posted on 07/18/2016 8:27:51 PM PDT by OldNavyVet (USS Intrepid Vet)
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To: BenLurkin

It’s not much of a stretch to imagine that tidal forces generated by nearby massive objects, for example a dumb box of rocks, or its equivalent such as a Michael Moore, may be responsible for causing a substantial proportion of the slippage along some of those faults.

In a manner of speaking, Michael Moore functions much like a supermassive black hole. Well, not really, rather it would be much more technically accurate to describe him as a supermassive a-hole.


17 posted on 07/18/2016 8:31:35 PM PDT by Zeppo ("Happy Pony is on - and I'm NOT missing Happy Pony")
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To: BenLurkin

Some?


18 posted on 07/18/2016 8:35:31 PM PDT by TexasTransplant (Idiocracy used to just be a Movie... Live every day as your last...one day you will be right)
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To: 43north

I have worked in Emergency Medicine for most of my career. I dread working the Full Moon and the few days following. Not sure if its the Moon’s pull on our precious bodily fluids but SOMETHING upsets a whole lot of people.


Same observation from law enforcement and mental health crisis workers. It will be relatively quiet and then you get a rash of crazy.


19 posted on 07/18/2016 8:36:28 PM PDT by volunbeer (ABH for President! - Anybody but Hillary)
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To: BenLurkin

I thought earthquakes were caused by global warming. S/


20 posted on 07/18/2016 8:37:26 PM PDT by Mark17 (The love of God, how rich and pure, how measureless and strong. It shall forevermore endure.)
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