Earthquakes, Circles and Spheres - Numberphile
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Date: 2022-04-09
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Comments and reviews: 9
Joseph
I'd show this to my A-Level Geology teacher, but it's not a taught subject at my old sixth form anymore: .
Interesting little nugget for anyone interested. The epicenter of an earthquake is the location on the Earth's surface that the earthquake emerges i. e. the location you would point to on a map.
The focus of an earthquake is the point in 3D-space within the bedrock that caused the slip that created the earthquake i. e. the point from which all the shockwave energy emanates.
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I'd show this to my A-Level Geology teacher, but it's not a taught subject at my old sixth form anymore: .
Interesting little nugget for anyone interested. The epicenter of an earthquake is the location on the Earth's surface that the earthquake emerges i. e. the location you would point to on a map.
The focus of an earthquake is the point in 3D-space within the bedrock that caused the slip that created the earthquake i. e. the point from which all the shockwave energy emanates.
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Zinc
I don't get the whole -2 waves- thing. I've experienced several tremors and one big earthquake in my life. The big one I felt last September 19th 2017, in Mexico City. Everybody felt first a vertical leap and immediately afterwards the whole ground started shaking.
Over here it's common -knowledge- the -fact- that earthquakes can come in one of two ways: trepidatory OR oscillatory. I heard somewhere that this has been debunked, but I'm still not convinced either way.
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I don't get the whole -2 waves- thing. I've experienced several tremors and one big earthquake in my life. The big one I felt last September 19th 2017, in Mexico City. Everybody felt first a vertical leap and immediately afterwards the whole ground started shaking.
Over here it's common -knowledge- the -fact- that earthquakes can come in one of two ways: trepidatory OR oscillatory. I heard somewhere that this has been debunked, but I'm still not convinced either way.
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Sergio
Average 3 years old European/American baby:
. learns how many fingers there are in one hand (maybe, never sleeps.
Average 3 years old Japanese baby:
- CAN CALCULATE THE LOCATION OF AN EARTHQUAKE'S HYPOCENTER AND ITS MAGNITUDE
- KNOWS THE SPEED OF DIFFERENT TYPES OF WAVES THROUGH SEVERAL SOLIDS, LIQUIDS AND GASES
- UNDERSTANDS TRIANGULATION, TRILATERATION AND GPS
- CAN ACTUALLY SLEEP LIKE A BABY
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Average 3 years old European/American baby:
. learns how many fingers there are in one hand (maybe, never sleeps.
Average 3 years old Japanese baby:
- CAN CALCULATE THE LOCATION OF AN EARTHQUAKE'S HYPOCENTER AND ITS MAGNITUDE
- KNOWS THE SPEED OF DIFFERENT TYPES OF WAVES THROUGH SEVERAL SOLIDS, LIQUIDS AND GASES
- UNDERSTANDS TRIANGULATION, TRILATERATION AND GPS
- CAN ACTUALLY SLEEP LIKE A BABY
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Jos-
If i understood correctly he mentioned the spheres' centers had to be on the same horizontal plane. In the case of real seismological stations that's almost impossible i assume. Is the theorem still valid or you just apply as if it were and its just a small rounding error?
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If i understood correctly he mentioned the spheres' centers had to be on the same horizontal plane. In the case of real seismological stations that's almost impossible i assume. Is the theorem still valid or you just apply as if it were and its just a small rounding error?
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icedragon769
The two-points theorem at the end really matters for another application of this method: GPS!
Knowing how close you are to three satellites lets you reduce your location to two possibilities, you need line-of-sight to four satellites to get down to one point
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The two-points theorem at the end really matters for another application of this method: GPS!
Knowing how close you are to three satellites lets you reduce your location to two possibilities, you need line-of-sight to four satellites to get down to one point
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pjohnston
-Usually we don't get Earth quakes from above. - Unfortunately, some examples of this killed hundreds of thousands of Professor Tadashi's countrymen, women, and children. Let us hope humanity never again unleashes the atrocity that is the power of atomic weapons.
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-Usually we don't get Earth quakes from above. - Unfortunately, some examples of this killed hundreds of thousands of Professor Tadashi's countrymen, women, and children. Let us hope humanity never again unleashes the atrocity that is the power of atomic weapons.
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Juan
I love all your videos and i would really like if you guys could make a video on conical spirals or helixes because my understanding of math isn't advanced enough to understand the papers on the matter.
Best regards Juan M.
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I love all your videos and i would really like if you guys could make a video on conical spirals or helixes because my understanding of math isn't advanced enough to understand the papers on the matter.
Best regards Juan M.
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Brooklyn
10: 18 I have found that my -P- waves happen almost immediately whereas it takes a minute or two for me to produce an -S- wave. The -S- waves hit harder, all at once, while the -P- waves tend to be constant.
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10: 18 I have found that my -P- waves happen almost immediately whereas it takes a minute or two for me to produce an -S- wave. The -S- waves hit harder, all at once, while the -P- waves tend to be constant.
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George
Tadashi reminds me of Feynman and some old infamous german orator. He explains things in a way that makes them sooooo obvious and yet 5 minutes later you are astounded that you could think that way.
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Tadashi reminds me of Feynman and some old infamous german orator. He explains things in a way that makes them sooooo obvious and yet 5 minutes later you are astounded that you could think that way.
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