Big Earthquakes Spark Jolts Worldwide

Science Daily ^ | 5-26-2008 | University of Utah

[SIDENET]

What’s shakin’, Blam?

[blam]

This map of the world shows seismic stations that detected more than twice the normal number of small, nearby earthquakes after the passage of what are known as "surface waves" from major quakes that were centered hundreds to thousands of miles away and occurred from 1992 through 2006. A new study co-authored by University of Utah seismologist Kris Pankow found that at least 12 of the 15 major earthquakes (greater than magnitude-7) during 1992-2006 triggered small quakes in distant parts of the world. Scientists once believed big quakes could not trigger distant tremors. (Credit: Aaron Velasco, University of Texas at El Paso)

[RightWhale]

large earthquakes routinely trigger smaller jolts worldwide, including on the opposite side of the planet

The angle is 120 degrees. It may work its way around to 180 degrees. The whole planet shakes for several days after a major quake and they seem to resonate according to the natural frequencies as standing waves. 1/3 seems more sustainable than 1/2. Ask your local percussionist.

[blam]

"What’s shakin’, Blam?"

Look at the west coast of the US on the map in post #3.

[RightWhale]

More data for quakes below 4.0 in N America.

[ArmyTeach]

I expected the west coast to be dense - I live in Alaska and lived in California. Also the New Madrid (I was there for the recent quake). I really didn’t think we were that unique; I expected to see more density in others points around the globe.

[null and void]

Ok, now here’s another exercise:

If a Chixulub size asteroid hits the earth, and rings the planet like a bell, would it trigger earthquakes and vulcanism world wide?

Second exercise:

If: “It has been proposed that the passage of the waves may change the water flow in a fault, possibly increasing the number of conduits that water can flow through which could cause the fault to slip.”

Then: Could disturbance of the aquifers expose the water to fresh mineral surfaces and “make a third of the waters bitter”?

[gitmo]

"It is interesting that Rayleigh and Love waves, two very different types of surface waves, are both able to trigger these events," says Pankow.

It's been my experience that Love Waves trigger lots of different events.

[null and void]

120°???

Oh crap.

Unless I’m much mistaken, 65 MYA that was the angle between Chixulub and the Deccan Traps!

[null and void]

Ummmmm, it’s most dense where there are more seismic stations...

[bigheadfred]

Scientists once believed big quakes could not trigger distant tremors.

There is a small area of Washington D.C., known for events of shocking stupidity. When such an event occurs, we feel the effects way out here in Idaho...

[Slip18]

I’ve only been in small EQs, up to 6.5 Richter Scale. All I know is the sliding glass door windows turned to something that looked like liquid. Pool overflowed. Things like that. Everything in the house that had more weight on top than bottom had been wired to studs.

Not in AZ. We just have to worry about things falling from the sky such as asteroids.

I love your threads, blam!

[RightWhale]

Looks about that on my Replogle.

[null and void]

Interesting. I think you’re on to something here!

BTW, I was yapping with weighted Companion Cube yesterday, and realized that we already have proof that there was life on Mars.

Mars is red because the soil is covered with rust.

On earth, we had seas green with elemental iron. Rust didn’t happen until photosynthesis started dumping raw oxygen into the atmosphere. (It was our planet’s first ecological catastrophe).

So, how did Mars end up with enough free oxygen to rust the entire surface? The only model we have for converting a primordial methane/carbon-dioxide/dihydrogen-monoxide atmosphere into an oxidizing atmosphere requires life...

[RightWhale]

APOD

The oxygen that rusts the surface iron on Mars originates predominantly from carbon dioxide gas, which composes 95% of the Martian atmosphere.

---

Given enough time

[Alia]

I have no problems following this logic with or without the number crunching: It makes sense.

[airborne]

December 21, 2012.