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Strong earthquake hits northern Japan, tsunami warning issued

www3.nhk.or.jp

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Re: Strong earthquake hits northern Japan, tsunami warning issued

#161

Post by kachapopopow »

cedws wrote: post #102
kachapopopow wrote: post #5

When I was in japan the earthquakes were oddly exciting rather than scary, had three different ones while I was there that visibly shook rather heavy objects around. Two being in a building and one outside. It was rather interesting seeing things shift around leaving a permanent imprint that there was in-fact an earthquake and it wasn't some kind of illusion when earthquakes these size couple of decades ago would cau…

I was secretly hoping for a 'proper' earthquake when I was living in Japan. Obviously I didn't want anybody to get hurt or anything to get damaged, but I only ever got to feel a few ~M3 earthquakes which were just slight bumps I felt when laying in bed.

I somehow ended up chasing major ones, had one shift my bed a quarter of a meter in saitama, then kyoto and finally a really strong one in osaka that shook the entire skyscraper pretty violently

Re: Strong earthquake hits northern Japan, tsunami warning issued

#162

Post by bluGill »

fogj094j0923j4 wrote: post #149
cedws wrote: post #99

Earlier quoted context omitted.

People were freaking about the July megaquake prophecy and nothing happened. Trying to time it is silly, just chill and enjoy your stay, you'll probably be fine.

Megaquake is following a major earthquake is well documented. This is not silly prophercy stuff. Parent was talking about that case.

True, but when it not known. Worse, this may be the "megaquake". There are earthquakes all the time. There often isn't a megaquake following a big one. They do often enough to be documented, but not every time.

Re: Strong earthquake hits northern Japan, tsunami warning issued

#163

Post by Aachen »

shiroiuma wrote: post #138
Aachen wrote: post #86

Earlier quoted context omitted.

Basically every language works that way? You can say underquake in English if you like, doesn't have to be Greek. In fact, it might make sense to pick a widely understood language rather than one with ~13 million speakers

"Hypocenter", like "epicenter", is English, not Greek. These words, like many words in English today, are made of Greek components, which is why kids are taught in grade school English class about Latin and Greek roots. No, not every language works this way, because not every language uses Latin and Greek root-words like this.

Ah yeah because everyone in England says hypo the sofa instead of under the sofa. Definitely not Greek

> not every language uses Latin and Greek root-words like this

I was responding to the text above where the person was amazed you can build/recognise a new word from parts. Idk who made the statement you're negating

Re: Strong earthquake hits northern Japan, tsunami warning issued

#164

Post by ZebusJesus »

ZebusJesus wrote: post #72

To think that these are happening more and more around the world and the USA just lost 9 detection stations near Alaska because of NOAA budget cuts. There was also the giant tsunami in the middle of nowhere this year. https://www.alaskasnewssource.com/2025/11/01/state-seismolog...

so don't talk about tsunami or how we are losing the ability to detect them in a tsunami post got it

Re: Strong earthquake hits northern Japan, tsunami warning issued

#165

Post by mturmon »

fc417fc802 wrote: post #124
mturmon wrote: post #101

Earlier quoted context omitted.

I think you intended this to be a validation of the idea that small quakes relieve stress and therefore lower the chance of a large quake. The above link does not answer that question. It is relating stress release to "fault strength", or the maximum shear stress that can be withstood by the fault. There is an incidental relationship with depth that plays a role. The video linked nearby (on criticality) also does not…

EQs are a release of energy. That energy is stored as stress prior to release. There is a finite amount of stored energy at any given time. So the statement "EQs release stress" is true and it follows that adding the modifier "small" to the front doesn't change this. It should also be immediately apparent that it would be very surprising if there were not statistical implications as a result of this. So surprising in…

For real: Earth science is complex. When you have domain experts literally saying the opposite of your guesses, in a section of an outreach webpage devoted to "Myths," reconsider your position.

(Related, and profound apologies for the fb.com link: https://www.facebook.com/DLJCSS/posts/small-quakes-do-not-pr...)

(Source: Work with Earth science domain experts in $dayjob, and am often surprised when my basic intuitive arguments turn out to be wrong.)

Re: Strong earthquake hits northern Japan, tsunami warning issued

#166

Post by fc417fc802 »

mturmon wrote: post #165
fc417fc802 wrote: post #124

Earlier quoted context omitted.

EQs are a release of energy. That energy is stored as stress prior to release. There is a finite amount of stored energy at any given time. So the statement "EQs release stress" is true and it follows that adding the modifier "small" to the front doesn't change this. It should also be immediately apparent that it would be very surprising if there were not statistical implications as a result of this. So surprising in…

For real: Earth science is complex. When you have domain experts literally saying the opposite of your guesses, in a section of an outreach webpage devoted to "Myths," reconsider your position. (Related, and profound apologies for the fb.com link: https://www.facebook.com/DLJCSS/posts/small-quakes-do-not-pr... ) (Source: Work with Earth science domain experts in $dayjob, and am often surprised when my basic intuitive…

It wasn't a guess. It's a matter of definition.

Your link addresses a different claim than the one I made. So far we have release of stress (true by definition), statistical correlation (foreshocks and aftershocks), and reduction of a future event (your link).

As to objections about relative quantities, earthquake swarms exist. I think it's going to be just about impossible to make claims that are correct while also being applicable to all scenarios. A more limited claim that a particular quake or activity in a particular region does not exhibit a certain sort of relationship is going to be much more defensible.

Re: Strong earthquake hits northern Japan, tsunami warning issued

#167

Post by anthk »

jacquesm wrote: post #51
anthk wrote: post #35

It has recently been a 4th degree one at Vitoria-Gasteiz, in the North of Spain. One of the least probable places you would even think of have an earthquake...

Unfortunately Spain and Portugal have seen quite a few earthquakes over the centuries, some of them quite deadly: https://en.wikipedia.org/wiki/List_of_earthquakes_in_Spain

That's the South; the zone I'm posting about it's pretty much near the Atlantic modulo a small mountain range.

Re: Strong earthquake hits northern Japan, tsunami warning issued

#168

Post by hnuser123456 »

somenameforme wrote: post #145
hnuser123456 wrote: post #129

Earlier quoted context omitted.

A manga book published in 1999 randomly predicted a disaster in March 2011, which seemed to come true with Fukushima. The manga was re-published in 2021 predicting a M8.8 in July 2025, but nothing happened. This is the dumb prophecy part, it was not based on seismology studies, just a shot in the dark to try to seem prophetic again. Countless works of fiction are published every year which predict some future disaste…

Math nazi in me really wants to point out that an event with a 1:1000 probability would be expected to be seen (> 50% probability) in about 700 years, not 1000.

Heh, hence why I said 1-in-1000-year, rather than just 1-in-1000. Indeed 1:1000 would happen within 693 years with 50% probability, 1:1443 would happen within 1000 years with 50% probability.
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