There have been a few down there and a number over beneath the La Conner/Mt Vernon area as well the last number of months. Not all related, or connected, but just little reminders.
And the waveforms recorded by @schoolshake.bsky.social from those three earthquakes.
While we are still seeing aftershocks from the M7.0 Hubbard Glacier event on December 6th in SW Yukon, a friendly reminder that down in Victoria we also live in Earthquake Country. These events are unlikely to have been felt, as they are small and relatively deep in the crust of the upper plate.
An interesting one to test would be the slide on the face of mt king George just before the YGS arrived by helicopter.
Of course it doesn't mean they aren't, just that it is much harder to tell than other large "solitary" landslides when the seismic signal is not buried within the aftershocks sequence.
Some of them could be of course, but many of these slides were likely very early on in the sequence. In the first hours to days, the events are literally tripping over each other. You could have 3 P wave arrivals from three different events all arriving before the S wave from the first.
What a beautiful day to fly in there. Spectacular!
The aftershocks continue, with fewer of course these days.
Updated images from events as of this morning, December 15th (roughly 1600), double difference relocated.
Landslides on the arete between Mt Vancouver and Mt Logan. Elevation difference between the central peak and the glacier is 500 m.
Large landslides on the southwest side of Mt King George. The main debris lobe on the right is approximately 1000 m wide. The elevation difference between the peak and glacier is approximately 1900 m.
Landslides on the west side of Mt King George. The central debris lobe is 500 m wide.
Large landslide on the southwest side of Mt King George. The main debris lobe is 1800 m wide, and material traveled approximately 6 km from the source area.
On FB, Yukon Geological Survey posted some spectacular photos of landslides & snow avalanches triggered by the magnitude 7.0 earthquake on Dec 6 in the St Elias Mountains. Here are some of my favs. @geocron.bsky.social @theronfinley.bsky.social @davepetley.bsky.social @ksvenenvig.bsky.social 🧪⚒️
It's the simple things isn't it 😅
I wish we could also have nice things John...
Thanks Steve, that would be great. My event file outputs are either csv or xml.
I'll say as well, when looking at the event distribution in 3D, it's possible that the mainshock is actually on the same fault as the rest of the events, just deeper, if the fault is steeply dipping to the SW. I don't have a good image yet to attach. Any suggestions on good 3D viewers?
A possible other option for the location of the main shock, is that it is nucleated on a conjugate structure, before propagating onto the main fault. Something like this was seen for Darfield and El Mayor-Cucapah. @faultydata.bsky.social, care to elaborate?
I should add, having seen the Sentinel radar from today and the huge number of landslides, I'm curious how many of these off axis events might be landslides. I've been a bad seismologist, and not looked at very many waveforms so far (most of the input events are automatic solutions)
Hey Steve, thanks. tTe star was added just to make it stand out. It was relocated with the rest of the aftershocks. Certainly could be a frequency affect. I belive the largest aftershock, the 5.7 the following evening, also relocates quite close to this main shock location.
Epicenter map of NLL-SSST-coherence relocated seismicity for the period 2020 to 9 Dec 2025 in the area surrounding the M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquake sequence. Purple lines show Quaternary faults from https://www.usgs.gov/programs/earthquake-hazards/faults
NLL-SC relocation of M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquakes and seismicity since 2020. UPDATED with events throug Dec 9. Relocation catalog: doi.org/10.5281/zeno...
Epicenter map of NLL-SSST-coherence relocated seismicity for the period 2020 to 8 Dec 2025 in the area surrounding the M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquake sequence. Purple lines show Quaternary faults from https://www.usgs.gov/programs/earthquake-hazards/faults
Preliminary NLL-SC relocation of M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquakes and seismicity since 2020. Hubbard events fall in void in earlier seismicity, show clear SE-NW trend, and suggest main rupture was ~vertical (strike-slip?) at SE and complex or dipping (toward NE??) to the NW.
A follow up with another few days of events. Now relocations of almost 600 earthquakes. These preliminary results suggest the main shock lies on a different fault a km or so SW, with most aftershocks tracing the possible Totschunda-Fairweather Connector Fault. Thoughts, @julieelliott.bsky.social?
Very preliminary relocation results from the December 6th #Alaska - #Yukon #earthquake, The Hubbard Glacier Earthquake. Double difference locations (343) derived from catalog epicentres (372), both manual and automatic. Squares are catalog epicentres, circles are relocations.
This won't have caused any damage, and not likely to have been felt by many. Anything to add, @earthquakeguy.bsky.social ?
Absolutely, I slept through it too, but @schoolshake.bsky.social picked it up.
This event, though at 16km depth, occurred right on the surfical trace of the San Juan Fault
Quick video about the M7.8 earthquake off the coast of Russia, including an animation from @earthscope.org showing the seismic waves detected by seismic stations across North America. 🧪
This mornings M3.0 felt earthquake near Duncan was well recorded on the #SchoolShake network. No damages expected, but a great reminder to be prepared.
Felt reports and details: www.earthquakescanada.nrcan.gc.ca/recent/2025/...
Even when camping, the earthquakes keep on coming. Didn't feel this out on the west coast, but it was felt across the CRD!
Small M1.9 earthquake this morning just offshore #VictoriaBC, at 5:39 am PDT, at 9 km depth. While not large enough to cause damage and not likely to be felt, another reminder of the hazard across the region. Well recoded by the @schoolshake.bsky.social @raspishake.bsky.social network.
A drone hovering above a field
Dusting off our lidar drone ahead of the summer surveying season @thatfaultguy.bsky.social @earthquakeandrew.bsky.social
Awesome, thanks.. Consider it signed then. In Canada, especially in SWBC and the Cascadia subduction zone, our own alerts and preparedness go hand in hand with the efforts in Washington and Oregon States.
Fishing for scientific clues!
Does it do any good for a non American based scientist to also sign?
