Earth crust deep sample test and Earthquake protection

Challenge to Plate Tectnics...

Roger

One of my friend asked..

..How can you get the sample from 700 km depth to test in laboratory and find the shearing strength.Once we get the laboratory test value we can compare with the stresses induced on plate boundry by mathematical formula.Thus can estimate and predict the major quake dates/period.

Answer....

 Recently China has drilled a deepest hole in crust up to 10 km.So we can get sample up to 10 km .If we take appropriate factor of safety for this sample we can have shearing strength up to 15 kms.

Here are some factual figure ..

All quakes after 1st January 1900

A) For 6+ quakes...

Total quakes........13899

Quakes up to 10 kms...2170...15.6%

Quakes up to 15 kms....5101..36.7%

B) 7+ quakes...

Total..........1492

up to 10 km...148.....10%

up to 15 kms..426...28.5%

C) 8+ quakes 

Total .....98

10 kms...7.....7%

15 kms...23...23.4%

So if we can get samples from 10 km depth we can predict fairly good percentage of quakes up to 15 kms depth

Formula...

we know area of Plate, depth of plate and average density..hence we know weight and mass both..W=mg ..where g is 9.81m/seconds Square 

We know velocity of plate in m/sec.

Hence...kinetic energy is..1/2m(v)Square..

we know the contact surface area of Plates (length x depth) in mtr square 

Hence we know force applied per unit area ie square meter on plate boundry 

Compare this force per sq mtr to laboratory tested value ( with due factor of safety)

Any problem?

Opinion of expert seismoligst are sought