Discover and read the best of Twitter Threads about #aftershocks
Most recents (6)
#Dozens #dead in #Turkey, #Syria after powerful #earthquake | -2h
- "We fear that the deaths are in the hundreds," Muheeb #Qaddour, a doctor in the Syrian town of #Atmed, told the Associated Press.
"We are under extreme pressure."
p.dw.com/p/4N8Ah?maca=e…
- "We fear that the deaths are in the hundreds," Muheeb #Qaddour, a doctor in the Syrian town of #Atmed, told the Associated Press.
"We are under extreme pressure."
p.dw.com/p/4N8Ah?maca=e…
7.8 magnitude #earthquake kills at least eighteen in #Turkey, thirteen in #Syria
- Hundreds of buildings have collapsed and there are fears that the #deaths could be in the #hundreds.
lemonde.fr/en/environment…
- Hundreds of buildings have collapsed and there are fears that the #deaths could be in the #hundreds.
lemonde.fr/en/environment…
Powerful 7.8 #Quake Knocks Down Buildings in #Turkey, Syria | -2min
- The quake, felt as far away as #Cairo, was centered north of the city of #Gaziantep in an about 90 kilometers (60 miles) from the #Syrian border.
nbcsandiego.com/news/national-…
- The quake, felt as far away as #Cairo, was centered north of the city of #Gaziantep in an about 90 kilometers (60 miles) from the #Syrian border.
nbcsandiego.com/news/national-…
Massive 6.4 #earthquake rocks #California leaving people without power | Dec 20
- Its #epicenter was 210 miles north of #SanFrancisco, where a quake hit last week
dailymail.co.uk/news/article-1…
- Its #epicenter was 210 miles north of #SanFrancisco, where a quake hit last week
dailymail.co.uk/news/article-1…
You might hear a geologist say: "We can't predict earthquakes."
Well, WHY NOT???
1/n
🧵⬇️⬇️⬇️
#earthquake #earthquakeprediction
Well, WHY NOT???
1/n
🧵⬇️⬇️⬇️
#earthquake #earthquakeprediction
First, let's define "prediction". A useful #earthquakeprediction will tell you where, when, and how big a significant #earthquake will be, with a reasonably high success rate.
That's different from #forecasting, #earlywarning, and #aftershocks. 2/n
That's different from #forecasting, #earlywarning, and #aftershocks. 2/n
To date NO ONE has developed an effective way to predict significant earthquakes.
Issue #1: Faults are fractal.
"But we know where the tectonic plates are!"
Yes, mostly, but plate boundaries are complicated - see the maps below comparing plates vs. faults. 3/n
#tectoplot
Issue #1: Faults are fractal.
"But we know where the tectonic plates are!"
Yes, mostly, but plate boundaries are complicated - see the maps below comparing plates vs. faults. 3/n
#tectoplot
Oh, cool!
Stress is basically how much the rocks are being squeezed, and in which direction. If we can know that, and also know how *strong* the rocks are, we can estimate whether they will break.
But it's super hard to measure... 1/n
Stress is basically how much the rocks are being squeezed, and in which direction. If we can know that, and also know how *strong* the rocks are, we can estimate whether they will break.
But it's super hard to measure... 1/n
When rocks *do* break (#earthquake!), we can use that to estimate stress. If you know the direction of slip, you can do even better. This even works for earthquakes that occurred long ago, if they left scratches on the fault!
rickallmendinger.net/faultkin
2/n
rickallmendinger.net/faultkin
2/n
Or, if you have a lot of money and time, you can drill into the Earth and measure the orientation of maximum squeezing based on how the borehole deforms.
#boreholebreakouts
3/n
jgs.lyellcollection.org/content/162/1/…
#boreholebreakouts
3/n
jgs.lyellcollection.org/content/162/1/…
#PuertoRico #USA #PuertoRicoEarthquakes
#PuertoRico still doesn't seem calm after so many #storms, and this Saturday there was a new 6.0 MI magnitude #earthquake on the momentum magnitude scale as part of a series of #aftershocks that have intensified since Friday night.
#PuertoRico still doesn't seem calm after so many #storms, and this Saturday there was a new 6.0 MI magnitude #earthquake on the momentum magnitude scale as part of a series of #aftershocks that have intensified since Friday night.
According to Prensa Latina, the meteorological phenomenon occurred in #Guánica, 14.87 kilometers south of #Peñuelas, at a depth of 5.04 kilometers.
On the other hand, the #NationalGuard of #PuertoRico considered declaring the island a #disaster area in order to receive additional funds after the #earthquakes.
(1) #Earthquake near #Anchorage, Alaska in the last hour.
Moderately deep & strong, expect some damage, but loss of life unlikely. Magnitude is usually downgraded from initial level.
Best info source:
earthquake.usgs.gov/earthquakes/ev…
Moderately deep & strong, expect some damage, but loss of life unlikely. Magnitude is usually downgraded from initial level.
Best info source:
earthquake.usgs.gov/earthquakes/ev…
(3) Some photos from around Anchorage that I've seen on Twitter. In New Zealand we have an earthquake of this type about once or twice a year. It is scary, but thankfully little damage is done.
#DropCoverHold is the best advice. More: ready.gov/earthquake
#DropCoverHold is the best advice. More: ready.gov/earthquake
(4) If you feel an earthquake when you're on a beach or within a few miles of the coast, be aware of #tsunami risk.
"If it's long or strong, get gone." There is no time for warning sirens or messages.
If you don't feel it, that means any tsunami is hours away. You have time.
"If it's long or strong, get gone." There is no time for warning sirens or messages.
If you don't feel it, that means any tsunami is hours away. You have time.
