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Author Topic: Do Earthquakes Happen Under Mountains ?  (Read 42221 times)

Offline neilep

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Do Earthquakes Happen Under Mountains ?
« on: 28/08/2007 22:58:33 »
Dearest Mountaineers,

D'ya like my mountain ?



Nice isn't it ?..it's being delivered next Tuesday...I just need to find a place for my bird bath now as it's taking it's place !

Do Mountains have earthquakes beneath them ?..I know they are formed by tectonic plate movement (Please confirm) and that they gain...what ?..an inch a year or something ?



Is this additional height a jolt or just a gradual smooth increase ?

If I was on top of Everest for instance and there was an earthquake below..would I feel it ?





 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #1 on: 28/08/2007 23:17:29 »
I think mostly gradual increase with time and many earthquakes although some doozies have been known to cause quite a large increase in some places, at least I believe that's what I recall. I have been on some large mountains and felt good size earthquakes, but everest is huge and I do not know in that size of a mountain! I would think so!
 

Offline DoctorBeaver

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Do Earthquakes Happen Under Mountains ?
« Reply #2 on: 29/08/2007 00:09:55 »
There was that dreadful earthquake a couple of years ago in the mountains of northern Pakistan, so I would imagine the answer is yes.
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #3 on: 29/08/2007 00:57:38 »
I tend to agree. at least that would be my assumption!
 

Offline JimBob

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Do Earthquakes Happen Under Mountains ?
« Reply #4 on: 29/08/2007 01:47:04 »
Gee Neil, If you put this in the GEOLOGY section you just might get an decent INFORMED answer.

(how is the sarcasm coming?)
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #5 on: 29/08/2007 01:55:15 »
HEE HEE HEE!
 

Offline neilep

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Do Earthquakes Happen Under Mountains ?
« Reply #6 on: 29/08/2007 02:13:32 »
The voices in my head said that if I moved this topic here that I might receive a decent INFORMED answer !!
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #7 on: 29/08/2007 02:15:43 »
I guess we are awaiting that answer now..JIMBOB! LOL
 

Offline JimBob

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Do Earthquakes Happen Under Mountains ?
« Reply #8 on: 29/08/2007 03:00:08 »
THE INFORMED ANSWER

I has been noted above that earthquakes do occur under mountains chains that are being uplifted. But they also occur in deep ocean trenches. And some mountain chains almost NEVER have earthquakes. Also, some earthquakes occur where no mountains are or probably have never existed.

To elucidate:

Mountain that are being formed by plate collision experience earthquakes because of the plate collision. As one plate passes under the other, as in the Himalayas or the Alps.

Mountains that have been around for a long time and that have eroded some - or a lot - have very little, if any, earthquakes. Areas such as these include The Canadian Shield and the Grenville Front which have almost no earthquake activity. The middle region of the Sahara, where Libya produces most of its oil, is also inactive. There is a mountain range (buried)under my feet here in central Texas, but this one has been rejuvenated withing the past 60 million years so there is occasional, small earthquakes. They occur very rarely since it has been 60 MY since reactivation.

Deep Ocean Trenches are also an area of active earthquakes due to collision of tectonic plated. They just build a deep hole, that goes down, but has one side, the overriding side, that has island made by volcanic eruptions on them. The classic example is the Marianas Trench, where the deepest spot in the oceans of the world exists.

There are other causes for earthquakes as well but since the question was about mountains we will only mention these in passing.

mid-ocean ridges - spreading apart of plates causes earthquakes.

transform zones - areas where plates move against each other. Large mountains CAN be built by this process but is normally not a large factor in mountain building. Thee are some large ones in Alaska, though.

Then there are the ones no one really has enough data to explain - The Charleston, South Carolina Earthquake and the Cairo Ill. are examples of these.

Thus Endeth The Lesson - (Not being Anglican or Catholic you won't get this.}

JimBob, Esq., Geologist Extraordinare

 

Offline Bass

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Do Earthquakes Happen Under Mountains ?
« Reply #9 on: 29/08/2007 03:08:08 »
Earthquakes happen everywhere Neil
So their shaking you will feel

In a tree
Under the sea

Hiking on a mountain
Splashing in a fountain

In the city
They're not witty

Even on a plain
they still cause pain

Uproot trees in the wood
Crumble buidings in the hood

They happen here
They happen there
They're everywhere! :D



 

Offline Bass

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Do Earthquakes Happen Under Mountains ?
« Reply #10 on: 29/08/2007 03:12:10 »
Now you see why I wasn't a lit major  :o

Oh, sure, if you want the INFORMED answer, check out JimBob's post.
 

Offline kdlynn

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Do Earthquakes Happen Under Mountains ?
« Reply #11 on: 29/08/2007 03:16:04 »
do they happen on a train?
 

Offline Bass

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Do Earthquakes Happen Under Mountains ?
« Reply #12 on: 29/08/2007 03:18:23 »
Even in the rain!
 

Offline Bass

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Do Earthquakes Happen Under Mountains ?
« Reply #13 on: 29/08/2007 03:19:36 »
However, there are no earthquakes on Mars (nor has there ever been an earthquake on Mars)!
 

Offline kdlynn

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Do Earthquakes Happen Under Mountains ?
« Reply #14 on: 29/08/2007 03:20:38 »
yes it would be a marsquake
 

Offline JimBob

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Do Earthquakes Happen Under Mountains ?
« Reply #15 on: 29/08/2007 03:23:12 »
Perhaps we should also add catastrophic events to the cause of earthquakes. The impact of a large meteorite would cause an earthquake.

Gee, I didn't get them all

 [:(!]
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #16 on: 29/08/2007 03:27:06 »
Not on a train not in the rain stop this silly quake talk your causing me Pain!! LOL

Good Job Jim BOB!

Hey Jim Bob I live on the San Andreas fault line in Humboldt county..Petrolia, Eureka Arcata, Mckinleville Blue lake.. we get lots of tremors all the time.. most everyday.. we don't feel a lot of them.. tell me about this area .. Crescent city above us was hit by quite a large tidal wave several years back.
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #17 on: 29/08/2007 03:27:20 »
Thats interesting!
 

paul.fr

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Do Earthquakes Happen Under Mountains ?
« Reply #18 on: 29/08/2007 03:33:58 »
do they happen on a train?
Even in the rain!
Not on a train not in the rain stop this silly quake talk your causing me Pain!!

From Earthquakes to Dr Seuss! green eggs and ham
« Last Edit: 29/08/2007 03:38:36 by paul.fr »
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #19 on: 29/08/2007 04:28:06 »
I love Dr. Suess, and green eggs and ham!
 

Offline Bass

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Do Earthquakes Happen Under Mountains ?
« Reply #20 on: 29/08/2007 06:11:16 »
Karen, the San Andreas is a "transform" fault- which means the two sides of the fault slide past each other (also known as strike-slip fault).  The fault separates two tectonic plates- everything west of the fault is on the Pacific Plate, and east of the fault is part of the North American Plate.  The Pacific plate is moving north relative to the North American Plate, so if you live west of the fault (most of Humboldt County is east of the fault), you'll be rubbing noses with eskimos in Alaska in the not to distant future (geologically speaking).
Most faults are either "normal" or "reverse", depending on which side of the fault moves up or down- as opposed to transform faults like the San Andreas.  Transform faults, on the other hand, are almost always very extensive in length, show considerable movement and create lots of earthquakes. 
The good news for you, being on the northern end of the San Andreas in California, is that you have lots of small earthquakes.  Seismologists (the folks that study earthquakes) worry most about the segments of the San Andreas that are quiet- because all that stress is buiding up in the rocks - which means a much larger earthquake the longer the segment is quiet.
Several years (actually decades) ago, an army base in Colorado was injecting some sort of waste water in deep drill holes.  All of a sudden, the area around the base started to experience lots of small quakes, which made folks in nearby Denver a bit nervous.  The army stopped injecting water into the wells, and the quakes stopped.  Intrigued by the possibilities, several scientists at the USGS proposed drilling wells along the San Andreas, and pumping water into one of the wells while pumping water out of all the adjacent wells.  The idea was to create small "controlled" earthquakes along the fault to relieve the strain in the rocks to avert a sure future catastrophe.  The plans were well developed when the lawyers finally pointed out the possible liabilities in setting off a possible uncontrollable major earthquake. Interesting idea anyway?
You had some recent activity in that area didn't you- seems I remember several 4+ magnitude earthquakes just offshore- was it May and June?
 

Offline DoctorBeaver

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Do Earthquakes Happen Under Mountains ?
« Reply #21 on: 29/08/2007 07:24:26 »
A clerihew for you...

I was in my home
When I read Bass's pome
It didn't half
Make me laugh

 ;D
 

Offline neilep

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Do Earthquakes Happen Under Mountains ?
« Reply #22 on: 29/08/2007 23:28:06 »
All I asked was quakes beneath a mountain ?
And lo did pass many posts from the fountain
With informed luff from Jimbob‘s face
To the quirky ge-ODE from Mr Bass !





Thanks for the excellent responses !!

BIG HUGS AND SHMISHES to you all !!

mwah mwah mwah !!
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #23 on: 19/09/2007 13:44:54 »
I love Dr. Seuss, and green eggs and ham!

That sounds about right as far as time frames. a few years back we had a 7.2 and 7.0 and other 4 and 5 point aftershocks .. Those were really amazing. 1rst one knocked me over off balance while vacuuming the floor. I thought I did it hitting my cabinet with the vacuuming.. LOL The only problem with that was that I was not a drinker so I realizes after several seconds we were having a big quake . I had time to get out of the house and watch things on the street sway and move telephone poles cars trucks rolling back and forth and huge waves of the paved street rolling along like ocean waves, actually humping up and straightening out! LOL! Was creepy!
 

Offline Karen W.

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Do Earthquakes Happen Under Mountains ?
« Reply #24 on: 19/09/2007 13:47:39 »
All I asked was quakes beneath a mountain ?
And lo did pass many posts from the fountain
With informed luff from Jimbob‘s face
To the quirky ge-ODE from Mr Bass !





Thanks for the excellent responses !!

BIG HUGS AND SHMISHES to you all !!

mwah mwah mwah !!


You are welcome Sir!  I would like to know more about where I live!
 

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Do Earthquakes Happen Under Mountains ?
« Reply #24 on: 19/09/2007 13:47:39 »

 

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