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Latest Earthquakes

earthquake.usgs.gov

11–20 of 63 posts

Re: Latest Earthquakes

#11
post #6

If you do feel a quake, don't forget to report it to the USGS! They need your data.

Don’t the USGS have seismographs for detecting earthquakes? Does human reporting add resolution or other information to their data?

https://earthquake.usgs.gov/data/dyfi/ USGS' "Did you Feel it Program" helps USGS figure out how seismic waves travel through the crust, which isn't uniform in density. Useful beyond seismographs.

Re: Latest Earthquakes

#12
post #6

If you do feel a quake, don't forget to report it to the USGS! They need your data.

Don’t the USGS have seismographs for detecting earthquakes? Does human reporting add resolution or other information to their data?

Sure, they have seismographs, but they don't necessarily have full details on all the subsurface geology between you and the epicenter. Wave propagation can be complicated... depending on what's down there, the waves can intensified, dissipated, reflected...

If (e.g.) everyone in a small area reports strong shaking, while those in surrounding areas report less, that can indicate a need for further investigation as to whether the area that experienced strong shaking poses a specific risk.

Re: Latest Earthquakes

#13
post #6

If you do feel a quake, don't forget to report it to the USGS! They need your data.

Don’t the USGS have seismographs for detecting earthquakes? Does human reporting add resolution or other information to their data?

> Does human reporting add resolution or other information to their data?

Yes, a lot. They only have so many seismographs. They ask a bunch of survey questions that get them a pretty good qualitative score of the experience in your exact location, and when merged together gives them a much better picture of how the waves propagated.

Also they ask you questions about damage, which they can't get from anywhere else.

Re: Latest Earthquakes

#14
post #9

This site ... integrated over Real time Solar Flares: https://www.spaceweatherlive.com/en/solar-activity/solar-fla... and random noise form Live Meteor: https://meteorscan.com/meteor-live.html runs my Random Number Generator....

How do you seed when there's no activity on all three fronts?

Re: Latest Earthquakes

#15
post #14
post #9

This site ... integrated over Real time Solar Flares: https://www.spaceweatherlive.com/en/solar-activity/solar-fla... and random noise form Live Meteor: https://meteorscan.com/meteor-live.html runs my Random Number Generator....

How do you seed when there's no activity on all three fronts?

I fall back on real time neutrino event detection :-) https://gcn.gsfc.nasa.gov/amon_hese_events.html

Re: Latest Earthquakes

#16
post #6

If you do feel a quake, don't forget to report it to the USGS! They need your data.

This is my favorite way of blowing off adrenaline after an earthquake. It's also fun to watch the reports roll in and see how different areas were affected.

Re: Latest Earthquakes

#18
post #9

This site ... integrated over Real time Solar Flares: https://www.spaceweatherlive.com/en/solar-activity/solar-fla... and random noise form Live Meteor: https://meteorscan.com/meteor-live.html runs my Random Number Generator....

I would be really interested in a write up of this!

Re: Latest Earthquakes

#19
post #5

Earlier quoted context omitted.

My favorite line from that article: >Kenneth Murphy, who directs FEMA’s Region X, the division responsible for Oregon, Washington, Idaho, and Alaska, says, “Our operating assumption is that everything west of Interstate 5 will be toast.”

These too: "Until 1974, the state of Oregon had no seismic code...seventy-five per cent of all structures in the state are not designed to withstand a major Cascadia quake..." "The shaking from the Cascadia quake will set off landslides throughout the region—up to thirty thousand of them in Seattle alone...Fifteen per cent of Seattle is built on liquefiable land, including seventeen day-care centers and the homes of…

So, time to add a lifestraw and shovel to the go bag.

Re: Latest Earthquakes

#20

I liked the previous title about the Monster of the Cascadian Basin. I looked it up (found nothing) but came across this on the cascadian subduction zone: https://pnsn.org/outreach/earthquakesources/csz This is what's responsible for "megathrust" earthquakes on the west coast every 400-600 years. It seems we're early for one of those, so this is probably not that. I'd love to see more info on the significance, if any…

More accurately, these quakes are on a strike-slip fault (named the Blanco Fracture Zone) on the other side of the Juan de Fuca plate from the Cascadian Subduction Zone. This fault won't directly produce 'the big one' but this movement will be building pressure and tension in the subduction zone.

https://www.npr.org/2021/12/08/1062365995/50-earthquakes-hit...

https://www.sciencedirect.com/topics/earth-and-planetary-sci...

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