Earthquake Early Warning and Structural Monitoring Systems for Everyone!
Joined April 2016
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18 Jun 2023
Started a new community!
Everyone is welcome!
x.com/i/communities/16704289…
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Jun 4
M5.7 event occurred offshore Oregon yesterday at 03:53:54. Key parameters are:
2026-06-03 / 03:53:54 (UTC-7)
Depth 10km
Epicentral distance to Vancouver was ~850 kms P and S wave travel times are, correspondingly, 110 sec and 198 sec. Lots of warning had this one been bad.
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Jun 2
Thanks for the reminder @volcaholic1 !
Jun 2
Last year, the strongest earthquake of 2025 struck off the coast of Kamchatka, Russia and it seemed to last forever.
It was a massive magnitude 8.8 quake with the epicentre about 110 to 150 kilometres southeast of Petropavlovsk-Kamchatsky.
It occurred in a subduction zone where the Pacific Plate is sliding beneath the Okhotsk Plate, sending strong seismic waves through the region.
Tsunami warnings were issued across the Pacific, including Japan, Alaska and Hawaii, and aftershocks have continued since.
Even for Kamchatka, which is used to major quakes, this one stood out as the strongest globally since the 2011 Tōhoku earthquake and among the largest ever recorded.
x.com/volcaholic1/status/201…
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May 22
And some more from @patton_cascadia
Thank you Sir!
#EarthquakeReport #TsunamiReport for #OTD 1960
M 9.5 #Terremoto #Sismo #Earthquake offshore of #Chile
largest instrumentally recorded earthquake in the world
generated transpacific #Tsunami
report: earthjay.com/?p=7109
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May 22
I can only imagine what it was like on the ground.
Thank you @JoseRodRibeiro a good reminder of how bad it can be, so, be prepared!
22 May 1960 19:11 UT
Mw9.5 Valdivia (Chile) #earthquake, the BIGGEST recorded EQ, a 1000 km rupture. Foreshocks M8.1-7.1-7.8 in the preceding 33 h. Death toll 1655, including 231 in Japan, Hawaii and Philippines due to the #tsunami.
earthquake.usgs.gov/earthqua…
chroniclingamerica.loc.gov
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May 20
So, in other news, we recorded a small EQ - no alerts were issued.
Magnitude 2.2
Date/time: 2026-05-20 / 05:38:59 (UTC-7)
Location: ~30km NE of Victoria
Depth: 53km
Epicentral distance to the site in Victoria: 35km
Theoretical warning time: 5sec
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May 11
A volcano for @volcaholic1 on her birthday!
This one doesn't do much though, sorry about that.
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Apr 28
Very interesting study, if you live in the area, you should have a look.
The Hayward fault — running 74 miles through the Bay Area — is overdue for a major earthquake. Scientists at @Livermore_Lab & @BerkeleyLab simulated 50 magnitude-7 scenarios to understand ground motion and help engineers prepare vulnerable buildings. livermorelab.info/4t0hQU3
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Apr 24
Took a ferry to the island today, had a look at one of our systems on the boat, and passed through the Shakealarm protected Massey Tunnel!
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Mar 28
Thanks @JoseRodRibeiro a stark reminder for all of us on the west coast of North America.
28 March 1964 3:36 UT (17:36 of 27th LT)
Mw9.2 Good Friday #earthquake, 2nd world's largest, at Aleutian Trench, near Prince William Sound in Alaska, killing 9 people. #Tsunami took 122 more lives in Alaska, Oregon and California.
earthquake.usgs.gov/earthqua…
nyshistoricnewspapers.org
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Mar 27
A particularly bad one, at that.
Remember, be prepared, think logically, and be aware.
Today is the 62nd anniversary of the magnitude 9.2 Great Alaska Earthquake. For plenty of Alaskans, memories of that day are still vivid. The earthquake ruptured a large portion of the Aleutian megathrust, where most of our big, damaging earthquakes happen. Earthquakes like these are the reason we are pushing to bring early warning to Alaska. Explore Alaska's past significant events, shown on the map here (with 1964 highlighted), on this site: bit.ly/4rXlKg0
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Mar 26
Thank you @patton_cascadia , good stuff here.
#EarthquakeReport #TsunamiReport for #OTD in 1964 M 9.2 #Earthquake in #Alaska
evidence for Alaska subduction zone type fault
significant ground shaking, landsliding, and liquefaction
transpacific tsunami causing damage and casualties across the Pacific
earthjay.com/?p=3833
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Mar 26
Very cool @InSeismoland , very cool indeed.
Our paper, led by @igna_sepulveda, co-authored with Bjarke Nilsson, Yao Yu, Matías Carvajal, Matthew Brandin & David Sandwell is out in @ScienceMagazine today!
science.org/doi/epdf/10.1126…
Video: Bjarke Nilsson
@SDSU @Scripps_Ocean @UCSD @udeconcepcion @LMU_Muenchen
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Mar 25
Up north, no alarm issued.
Event parameters:
Magnitude: 4.1
Date/time: 2026-03-25/06:25:36 (UTC-7)
Epicenter coordinates: 52.536N / 131.652W
Depth: 10km
Epicentral distance: 205km
P-S difference for the seismic station: 23 sec.
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Mar 20
Best one I have seen so far, rest easy Chuck, you will be missed.
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Mar 11
A reminder that is best not forgotten for those of us in the PNW. Thank you @volcaholic1
x.com/i/status/2031660563453…
Mar 11
🧵 Today marks 15 years since the magnitude 9.1 Great East Japan earthquake struck off the northeast coast of Honshu on 11 March 2011. One of the most powerful earthquakes ever recorded. 1/4
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Feb 4
Very powerful stuff; hard to believe the little boats made it.
Thanks @Rainmaker1973 appreciate the reminder.
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Jan 28
Although normally I would advocate for, dropping, covering and holding on, she saved the cats so she gets a pass.
A camera captures the moment when a girl runs to protect what matters most to her during an earthquake.
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