Moment Magnitude Explained-What Happened to the Richter Scale?
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- Опубликовано: 31 июл 2024
- www.iris.edu/educate for more animations
Scientists have developed far-more sensitive seismometers that, with faster computers, have enabled them to record & interpret a broader spectrum of seismic signals than was possible in the 1930's, when the Richter magnitude was developed. The Richter Magnitude Scale is effective for nearby earthquakes below magnitude 7, but not for larger earthquakes. The Moment Magnitude Scale uses seismograms plus what physically occurs during an earthquake (which can also be derived from seismograms), known as the "seismic moment". The seismic moment defines how much force is needed to generate the recorded waves. That information is plugged into the moment magnitude scale to give us the amount of energy that is released during an earthquake.
For an interactive magnitude calculator, please visit: www.iris.edu/edu/10.5/EQSimula...
Directed by Robert Butler, University of Portland OR
Animation by Jenda Johnson, Earth Sciences Animated
Narrated by Roger Groom, Mt. Tabor Middle School, Portland OR
Original music by Jesse Gay, CNS Engineering
Photographs courtesy of US Geological Survey
Reviewed by Robert Lillie, Oregon State University and
Kaz Fujita, Michigan State University 
Наука
I come to learn but I end up dancing
Oscar martin quintanilla haha same
Nice presentation, but the background bleeps and bloops are utterly maddening.
WHY? :(
Great!
If you can’t explain your ideas to your grandmother in terms that she understands, you don’t know your subject well enough. =)
Thank you a lot!
this was so, so useful. Thank you so much
This video is excellent but please tone down the disco beat as the narrator is soft-spoken and the beating in the background is drowning him out. Lower or even no background music would be great. Thank-you
Background sound should be reduced for hearing the concepts clearly....
you answered my question! Thank you.
very good video - would be helpful if you explined you what the richter scale actually is and what happened to it. Thanks
good video!
2:34 ... I have seen this picture before in book I used to have about California Earthquakes. The "repair" was not shown in the original picture. Is this offset fence still standing? I wonder how the property land surveyors handle this?
So, how does one come up with the area of slip, when the focus is under water? Or when the earthquake doesn't have any surface fault rupturing? Are these found only by aftershock sequences? I always hear people explaining the equation for computing the seismic moment, but never going into detail as to how those are determined. It isn't like one can go beneath the surface of earth in order to measure the area of slip. Another thing, how do you determine mu? Do you just assume granite?
I danced through the entire explanation. I'm just so curious what prompted that music choice lol
Good explanation
- Sabtu, 30 Desember 2023, pukul 20.31 WIB
The dinosaur extinction asteroid impact event caused a magnitude 12.55 earthquake!
Great, now I want spagetti
Can someone explain why the mantle has a higher rigidity? Shouldn't it be more viscoelastic, and therefore more able move?
i have the same question here. i was guessing anyway if it is not for the fact that the mantle, being constitued by denser materials, is therefore quite more rigid than crust.i dont know if it is in contrast with the fact that confining pressure make rocks behave more plastic. if anyone can explain it would be appreciated
Joseph Batt I'm confused, too. Maybe they meant lower vs. higher in the crust? The mantle is a whole different thing, and it doesn't make sense for molten material to have higher rigidity than rock. Right??
+Julia Edwards The mantle is solid. The asthenosophere (boundary between crust/mantle) is plastic and able to flow. Allows tectonic plates to move.
Right. Because if the mantle were truly liquid, then S waves would not be able to pass through it.
the mantle behaves like a non newtonian fluid.....which simply means that it behaves differently depending on how the stresses are applied.......so for stresses that are continuously being generated it behaves plastically and makes possible mantle convections but for short duration stresses it behaves like a rigid body...........much like a silly putty......so it is both plastic or rigid depending on how stress is applied.
cool
1 million pieces of spaghetti? That's a big twinkie. (come on, Ghostbusters anyone?)
Good vid, easy to follow!
omg the background noise gives me the worst anxiety
but how far does the fence actually move?
The fence did not move. The land on the west side moved north with respect to the east side. This was the fault displacement at that point, meaning the fault rupture was directly under the fence.
It's over 9,000!!
How on earth would the rigidity be higher in the mantle?? The mantle is all molten material. Do they mean lower in the crust, as opposed to higher?
+Julia Edwards it is molten below the crust because of the temperature but the mantle itself is a solid
@@AngelAlita84 much higher pressures as well.
Thatsa lotta spaghetti...jk. But it makes sense! I think but a little confused on the mantle bit! Hmm...Great video tho!
1 million pasta?
partyyyyyyyyyyyyyyy
I'm dyscaculiac so I don't understand the math stuff but still this was interesting
Too much bad background music.
Background music is really annoying.
Bending rock .............
watch on 0.5
My teacher made us watch this in class
:/