March 11, 2011 Japan Earthquake-10th Anniversary-Lessons Learned (educational)

It has been 10 years since the magnitude 9.1 earthquake and resulting tsunami hit Japan, on March 11, 2011 [Errata: Miyagi is misspelled. Apologies.]
Scientific lessons learned and described here include:
1. Tsunami geology can extend the earthquake record by centuries or millenia.
2. Earthquake Early Warning can mitigate damage and save lives, but the 2011earthquake revealed limitations of a system using only seismometers.
3. Adding Global Positioning System observations of earthquake ground motion improves accuracy of earthquake early warning, and is essential to tsunami warnings.
Errata: spelling of Miyagi.

[@JQuake]

Excellent quality material. I'm very glad you took into account my advice ;)

[@IRISEarthquakeScience]

Animator here: I was so focussed on the message that i missed the spelling. Thank you for taking the time to correct the alert messages. My Japanese is nonexistent, I am sorry to admit.

[@pompomaddons]

JQUAKE IS HERE

[@hazemblahtimeyyy]

@@pompomaddons yes we are

[@freedomthroughspirit]

Well done! Thank you. I'm enjoying understanding more about quakes and lessons learnt.

[@popozz]

7:10 I think it is a little different.
Japan does not use the general Moment Magnitude "Mw", but uses the unique Japanese JMA Magnitude "Mj" to indicate the magnitude of an earthquake.
"Mw" is suitable for expressing the energy of large earthquakes, but it underestimates localized earthquakes compared to the actual damage. And small earthquakes cannot be evaluated correctly. It also takes a long time to calculate.
On the other hand, "Mj" is set to give a figure appropriate to the scale of damage. "Mj" is suitable for evaluating active fault earthquakes and small earthquakes, but it has the disadvantage that earthquakes with a magnitude of Mj 8 or higher are difficult to increase in magnitude in calculations.
The "M(j)8.0" of the Great East Japan Earthquake is a typical example. Later, M(w)9.0 was used for 3.11 earthquake. These figures are different information.
Incidentally, the Great Hanshin Earthquake in 1985's "Mj" was 7.3, and "Mw" was 6.9. It was a very shaking earthquake that almost destroyed the city of Kobe, but "Mw" figure was small, because it was not widespread. "Mw" number is small, but "Mj" number is very dangerous.
There are advantages and disadvantages to both, and they are used in different ways depending on the scale of the earthquake.

[@michaellovely6601]

Uh, the Great Hanshin earthquake occurred in 1995; not 1985.

[@ActuallyYes]

6:44 despite the efficiency of the system
The system at the time make many’s of the victims question due to inaccurate warning issued
Because the shaking extended from Aomori all the way to Kanagawa, but the warning only issued for the Tohoku Area.

[@elric_310]

Amazing video! Thank you for the great and inspiring job of making this knowledge more accessible !

[@deepquake9]

Love this channel 💗

[@FajriSiddiq]

very easy to understand,

[@vincently1995]

10th Anniversary of Great Tohoku Earthquake and Tsunami (2011-2021)

[@cat1554]

0:09
"Ta hoku"

[@sherimatukonis6016]

They expect the Cascadia Subduction Zone to be a mirror image of this... Except that the west coast of America is not anywhere near as well built or prepared for it. Casualties will be much higher.