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Info from Geological Society of America regarding Myanmar earthquake

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dlamberth

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"An M7.7 earthquake struck overnight near Mandalay, Myanmar, as the result of strike slip faulting between the India and Eurasia plates. Focal mechanism solutions indicate that slip occurred on either a north-striking, steeply-dipping, right-lateral fault, or a west striking, steeply-dipping, left-lateral fault. The finite fault solution indicates a north striking right-lateral fault. This focal mechanism and finite fault solution are consistent with the earthquake potentially occurring on the right-lateral Sagaing Fault that lies in the fault zone that defines the plate boundary between the Indian and Sunda plates.

While commonly plotted as points on maps, earthquakes of this size are more appropriately described as slip over a larger fault area. The finite fault solution indicates the size of this event is about 200 km by 20 km (length x width).

This region has experienced similar large strike slip earthquakes, with six other magnitude 7 and larger earthquakes occurring within about 150 miles (250 km) of this earthquake since 1900. The most recent of these was a magnitude 7.0 earthquake in January 1990, which caused 32 buildings to fall. A magnitude 7.9 earthquake occurred south of today’s earthquake in February 1912. Within this broad zone of tectonic deformation, other large earthquakes include a magnitude 7.7 earthquake in 1988."

487450050_1049633030525519_5967537584786192121_n.jpg
 
Hans Blaster

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dlamberth said:
"An M7.7 earthquake struck overnight near Mandalay, Myanmar, as the result of strike slip faulting between the India and Eurasia plates. Focal mechanism solutions indicate that slip occurred on either a north-striking, steeply-dipping, right-lateral fault, or a west striking, steeply-dipping, left-lateral fault. The finite fault solution indicates a north striking right-lateral fault. This focal mechanism and finite fault solution are consistent with the earthquake potentially occurring on the right-lateral Sagaing Fault that lies in the fault zone that defines the plate boundary between the Indian and Sunda plates.

While commonly plotted as points on maps, earthquakes of this size are more appropriately described as slip over a larger fault area. The finite fault solution indicates the size of this event is about 200 km by 20 km (length x width).

This region has experienced similar large strike slip earthquakes, with six other magnitude 7 and larger earthquakes occurring within about 150 miles (250 km) of this earthquake since 1900. The most recent of these was a magnitude 7.0 earthquake in January 1990, which caused 32 buildings to fall. A magnitude 7.9 earthquake occurred south of today’s earthquake in February 1912. Within this broad zone of tectonic deformation, other large earthquakes include a magnitude 7.7 earthquake in 1988."

View attachment 362827
Click to expand...
*USGS (United States Geological Survey, US Department of the Interior)

That a big rip with some very intense shaking. At least 150 are dead.
 
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sjastro

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Some scientific information about the Myanmar earthquake.
First of all some preliminaries much of which was covered in debunking Walt Brown's Hydroplate theory.

Earthquakes generate seismic Primary (P) and Secondary (S) waves.

Primary_Secondary.png

​
When travelling through the Earth waves are refracted and reflected forming shadow zones where no seismic data can be recorded.

S_P_waves.png

​
Now for the data here is some basic information from the United States Geological Survey (USGS).

Seismic data from two stations in Thailand and Australia.

Thailand.png

Marble_Bar.png
"PP" and "SS" refer to specific seismic wave phases, a "PP" wave represents a P-wave that has reflected off the Earth's surface once before being recorded, while an "SS" wave denotes an S-wave that has undergone a similar surface reflection.

Note only P waves has been recorded at Marble Bar Australia.
The earthquake's approximate coordinates was 21°N, 96°E, while Marble Bar approximate coordinates are 21°S, 119.75°E.
The angular distance (great-circle distance) between them is ~108° and since it falls inside the S-wave shadow zone (which starts at ~103°), no S waves were recorded at the station.
P-waves however travel through the liquid outer core and were recorded at Marble Bar.
 
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AV1611VET

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sjastro

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sjastro said:
Some scientific information about the Myanmar earthquake.
First of all some preliminaries much of which was covered in debunking Walt Brown's Hydroplate theory.

Earthquakes generate seismic Primary (P) and Secondary (S) waves.

When travelling through the Earth waves are refracted and reflected forming shadow zones where no seismic data can be recorded.

Now for the data here is some basic information from the United States Geological Survey (USGS).

Seismic data from two stations in Thailand and Australia.

"PP" and "SS" refer to specific seismic wave phases, a "PP" wave represents a P-wave that has reflected off the Earth's surface once before being recorded, while an "SS" wave denotes an S-wave that has undergone a similar surface reflection.

Note only P waves has been recorded at Marble Bar Australia.
The earthquake's approximate coordinates was 21°N, 96°E, while Marble Bar approximate coordinates are 21°S, 119.75°E.
The angular distance (great-circle distance) between them is ~108° and since it falls inside the S-wave shadow zone (which starts at ~103°), no S waves were recorded at the station.
P-waves however travel through the liquid outer core and were recorded at Marble Bar.
Click to expand...
When the Marble Bar seismic wave detection is extended out to 20 minutes instead of the default value of 10 minutes, S waves appear in the data which seems to contradict that Marble Bar is in the S wave shadow zone relative to the Myanmar earthquake.

Marble_Bar_20.png

I posed this as a question (and challenge) to AI.

Explanation.png
 
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sjastro

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sjastro said:
When the Marble Bar seismic wave detection is extended out to 20 minutes instead of the default value of 10 minutes, S waves appear in the data which seems to contradict that Marble Bar is in the S wave shadow zone relative to the Myanmar earthquake.


I posed this as a question (and challenge) to AI.

Click to expand...
@Hans Blaster will take comfort that AI (GPT-4o) has totally botched this response.

I wasn’t entirely satisfied as the time delay between the incoming S and P waves at Marble Bar according to the data was 15min 52 sec – 8 min 46 sec ≈ 7 minutes.
Since most of the seismic waves from the earthquake epicentre to Marble Bar travelled through the mantle, the P wave velocity is in the range 8 - 13 km/s and S wave velocity 4.5 – 7 km/s.
Since the crust slows down seismic wave velocity, I used the lower range values to calculate the theoretical time delay Δt between P and S waves reaching Marble Bar which is 5260 km from the earthquake epicentre using the Latitude Longitude Distance Calculator.

Δt = 5460/4.5 – 5460/8 = 1,213 – 682 = 531 seconds ≈ 9 minutes.

This didn’t gel with AI’s response of scattering, diffraction and energy loss all of which would have led to a much longer delay time between P and S waves.
The penny dropped when I converted the distance d to angular separation θ using the formula,
θ = d/r = 5460/6371 ≈ 0.857 radians where 6731 km is the Earth’s radius.
Converting radians to degrees,
θ = 0.857 x 180⁰/π ≈ 49⁰

The value of 108⁰ quoted in post #5 was a task I gave to GPT-4o which any reasonably smart AI should have been able to provide the correct answer.
Since this value falls in the S wave shadow zone, GPT-4o’s response while appearing to be informative in trying to explain how S waves were found in the Marble Bar data is complete rubbish as it is based on an erroneous calculation.
Incidentally DeepSeek came up with the value of 49⁰ and correctly concluded S waves were in the Marble Bar data as it was outside the shadow zone.
 
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Ophiolite

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Warden_of_the_Storm said:
No excuse. No-one is too old to learn new things.
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More than that, Warden, - and I think this is implicit in your remarks - it's not just that the capacity to learn new things does not disappear with age (barring dementia and the like), but the desire to learn new things should still be fresh. Indeed, as one's knowledge increases one becomes increasingly aware of how much more is unknown than we once imagined. The desire to learn more should increase. Perhaps the problem is that AV is still too young. :) I consider any day in which I didn't learn something new to be a wasted day.
 
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tharkun73

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sjastro said:
Some scientific information about the Myanmar earthquake.
First of all some preliminaries much of which was covered in debunking Walt Brown's Hydroplate theory.
Click to expand...
Just curious - how does this disprove the Hydroplate Theory? Not saying I agree with it; but I am familiar with it. Thanks.
 
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sjastro

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tharkun73 said:
Just curious - how does this disprove the Hydroplate Theory? Not saying I agree with it; but I am familiar with it. Thanks.
Click to expand...
The theory states that subterranean chambers filled with water still exist, S waves cannot travel through liquid mediums while P waves would be reflected and refracted at different angles producing different shadow zones to what is produced by the Earth's interior.

Scientists speak out about evidence of Intelligent Design in nature..

The Biblical order is "Earth > Moon > meteorites". And it makes a lot more sense when explained by Walt Brown's HydroPlate Theory. In the Beginning: Compelling Evidence for Creation and the Flood - The Origin of Asteroids, Meteoroids, and Trans-Neptunian Objects My goodness even the title...
www.christianforums.com www.christianforums.com
 
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tharkun73

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sjastro said:
The theory states that subterranean chambers filled with water still exist, S waves cannot travel through liquid mediums while P waves would be reflected and refracted at different angles producing different shadow zones to what is produced by the Earth's interior.

Scientists speak out about evidence of Intelligent Design in nature..

The Biblical order is "Earth > Moon > meteorites". And it makes a lot more sense when explained by Walt Brown's HydroPlate Theory. In the Beginning: Compelling Evidence for Creation and the Flood - The Origin of Asteroids, Meteoroids, and Trans-Neptunian Objects My goodness even the title...
www.christianforums.com www.christianforums.com
Click to expand...
I understood that the chambers all collapsed during the flood and are no longer in existence. Can you point me to the reference in his online book where he says they still exist?
 
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sjastro

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tharkun73 said:
I understood that the chambers all collapsed during the flood and are no longer in existence. Can you point me to the reference in his online book where he says they still exist?
Click to expand...

The illustration is evidently taken from Walt Brown's book and shows trapped water under a mountain range after the supposed great flood.
If the mountain range is a product of tectonic uplift and therefore a source of earthquakes, the seismic waves from the epicentre above this trapped water will be affected.

The evidence from seismic waves travelling through the Earth's interior indicates the Moho discontinuity which is the boundary between the crust and mantle is a continuous solid boundary indicating a shift from less dense crustal rocks to denser mantle rocks.
 
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AV1611VET said:
Good point.



Depends on what it is.

But gimme a break, Warden.

I'll be 71 in May!
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In that case, I wish you 71 more years to become the best man you can be, physically and intellectually.
 
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