Roger ,I think with USGS catalog available,you can devise a program which can count all 6+ quakes from 1900 ( or earlier,if available ) per each 100 km depth from. 0 to 800 kms
We can have a picture of what I am saying is correct and that hypothesis works...
Which roughly says...
For a quake to occur two things are required...
1) A solid or partially solid layer
2) A liquid or viscous movable layer below solid layer
With tidal pull on liquid layer the upper solid crust gets broken partially resulting in a quake.So quakes can occur in solid layers only
So major quakes can occur in solid layers of Earth anywhere upto upper core( because below core there is nothing)
That is why we do not have major quakes between 300 to 500 kms depth
This is the real cause of deeper quakes at 600 to 800 kms where deeper solid layer is partially broken by tidal pull on liquid layer below it
3 comments:
Amit;
I think you're overestimating the tidal force. It moves the ocean a few feet so I can't imagine it moves even liquid rock buried hundreds of kilometers below the surface of the earth to the degree you require.
Roger
Roger
Ok
Let us talk about what Plate tectonics believe. As the existing theory The heat currents/convection currents below the upper crust moves all Plates.
Now let us compare the volume of liquid which as heat currents/convection currents are believed to be moving plate with the volume of liquid acting under tidal pull.
Heat currents are localized small strem of liquid comming from top to bottom to disperse the heat,exactly as seen in boiling water
Whereas tidal pull act on complete length of longitude from North pole to South pole.
Unlike heat currents tidal pull create a surge in hightide wave.
Roger most important thing you are missing is...
..Tidal pull depends on volume of liquid over which it is applied. Remember there is no high tide in a small pond and 5 to 6 mtr in oceans. Now think ,how much bigger the volume of liquid fluid below crust as compared to few thousand mtr depth of ocean water.
Compare the volume..
10 times,100 times,1000 times , 10,000 times
Decide the ratio of both volumes and ratio of mtrs height in tide
Amit;
The layer you're talking about is not liquid like water, it's simply soft enough (due to heat)
to be able to move, given sufficient force. It's also under huge pressure from the rock mantle above it.
I'm just not convinced that the moon's gravitational attraction is sufficient to deform the upper mantle enough to cause an earthquake in the crust.
Roger
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