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Edwin Nissen

@faultydata.bsky.social
2.1K followers 340 following 154 posts

Professor/Canada Research Chair in seismology in Victoria BC 🇨🇦. Earthquakes, active tectonics, remote sensing. Proud cat dad. Views my own

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Reposted by Edwin Nissen
John Cassidy @earthquakeguy.bsky.social · 29/08/2026
Natural Resources Canada is hiring: Field Electronics Technologist - Closing Sept. 17, 2026 Victoria, BC; Yellowknife, NT or Ottawa, ON emploisfp-psjobs.cfp-psc.gc.ca/psrs-srfp/ap... Seismic Analyst - closing Sept.9, 2026 Victoria, BC or Ottawa, ON emploisfp-psjobs.cfp-psc.gc.ca/psrs-srfp/ap... ⚒️🧪🇨🇦
emploisfp-psjobs.cfp-psc.gc.ca
Field Electronics Technologist
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Edwin Nissen @faultydata.bsky.social · 29/08/2026
This looks suspiciously like AI. There is no vegetation at the altitude of the landslide source, and by the time it reached this altitude, it was surely channelized?
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Melaine Le Roy @subfossilguy.bsky.social · 29/08/2026
Latest high resolution drone pictures of the source area of the rock ice avalanche that triggered the Nepal flood! 🧊🌊 📷 Guoxiong Zheng
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Dave Petley @davepetley.bsky.social · 26/08/2026
Some initial thoughts on the catastrophic debris flow in Nepal and Tibet in Nepal and Tibet today:- eos.org/thelandslide... This draws on the initial analysis of @planet.com images by @watershedlab.bsky.social
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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 26/08/2026
The source of the flood in Nepal is a collapsed glacier 🧪⚒️
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Michael Le Page @mjflepage.bsky.social · 26/08/2026
Initial analyses of satellite images and seismic data by @watershedlab.bsky.social & @kristencook.bsky.social suggest that the collapse of a high glacier caused the flash flood disaster in Nepal www.newscientist.com/article/2586...
newscientist.com
A glacier collapse is most likely cause of the Nepal disaster | New Scientist
Melting snow appears to have weakened a steep glacier at an altitude of 5 kilometres, causing it to plummet around a kilometre into the river valley below
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Seismica @weareseismica.bsky.social · 07/08/2026
Could the San Juan Fault pose an earthquake risk to Vancouver Island? Salomon et al. find evidence for recent fault motion and call for further investigation of this potentially active fault. 🔗 Read now: seismica.library.mcgill.ca/article/view...
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Dr. Heather McFarlin @volcanoheather.bsky.social · 05/08/2026
Pleqse share!! Postdoc opportunity for near-real-time landslide detection in Alaska!!! The successful applicant will get to work with the amazing @ezgikarasozen.bsky.social See this page for more info! earthquake.alaska.edu/job-opportun... 🪨⚒️🧪
earthquake.alaska.edu
Job Opportunities | Alaska Earthquake Center
The Earthquake Center’s success is built through the collaboration of people with different specialties. Our team includes scientists, technicians, engineers, communications professionals, IT speciali...
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Edwin Nissen @faultydata.bsky.social · 02/08/2026
Off the coast of *Vancouver Island*. Off the coast of Vancouver would be the Georgia Strait
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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 16/07/2026
Are you a Canadian PhD student or recent grad (or international person with a PhD from Canada or currently in Canada) and want to do geohazards or geomorphology research with me @ucalgaryscience.bsky.social , get in touch! 🧪⚒️❄️🛰️ nserc-crsng.canada.ca/en/funding-o...
nserc-crsng.canada.ca
Canada Postdoctoral Research Award program
The Canada Postdoctoral Research Award (CPRA) program supports and promotes research excellence in a wide variety of disciplines and broad fields of health, natural sciences and engineering and social...
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Edwin Nissen @faultydata.bsky.social · 07/07/2026
Lofoten is pretty much my favourite place in the universe!
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Edwin Nissen @faultydata.bsky.social · 27/06/2026
Strike-slip faults can also be vertically-segmented. There’s an amazing case study from Iran of two successive M7 EQs that ruptured and then re-ruptured the same section of the Gowk fault. The first was deep, the second shallow. So that’s another possibility
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Edwin Nissen @faultydata.bsky.social · 27/06/2026
Rather I wonder whether there is some kind of unusual structural complexity right around the two epicenters that pressed pause on the rupture process. After all, the epicenters are right where two major fault systems (one E-W and the other NE-SW) appear to merge.
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Edwin Nissen @faultydata.bsky.social · 27/06/2026
The decorrelation is from (1) very steep topography along that coastline and (2) the fact that the rupture is only barely offshore, so that the deformation gradient is exceptionally steep. Under these circumstances “better” atmospheric conditions during future acquisitions won’t help much if at all.
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Edwin Nissen @faultydata.bsky.social · 27/06/2026
I’m not so sure. The epicenters seem too close for much of a seismic gap (albeit the second epicenter is presumably quite rough). Neither the focal mechanisms, InSAR fringes, or aftershock distribution support much of a change in fault strike.
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Edwin Nissen @faultydata.bsky.social · 25/06/2026
There was a good article on this topic, published in Nature no less, almost a decade ago. Alas, plus ça change. www.nature.com/articles/545...
nature.com
Report estimated quake death tolls to save lives - Nature
Earthquake survivors could be rescued more quickly if the media communicated the number of likely fatalities from the outset, argues Max Wyss.
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Edwin Nissen @faultydata.bsky.social · 25/06/2026
Very well said on the early reporting of minuscule fatality tolls. As always, the worst hit areas are the slowest to communicate and report. Journalists reporting on earthquakes need a primer on the USGS PAGER system.
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Edwin Nissen @faultydata.bsky.social · 25/06/2026
The distinction between “doublet” and “two sub-events” may be semantic in this instance. I think it would depend on whether there’s a clear gap (in space or time) between the two events, which we can’t know yet.
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Edwin Nissen @faultydata.bsky.social · 25/06/2026
This was a similar doublet in terms of timing. It was listed as a single M7.2 in catalogs, but was in reality a pair of 7s ~20 sec & 50 km apart. Waveform models were ambiguous but InSAR and BP really gave the game away. No local records of wave interference though... www.nature.com/articles/nge...
nature.com
Limitations of rupture forecasting exposed by instantaneously triggered earthquake doublet - Nature Geoscience
Assessments of earthquake risk often assume rupture of a single fault. Analysis of a 1997 Pakistan earthquake reveals that not one but two separate ruptures caused the shaking, implying that cascading...
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Edwin Nissen @faultydata.bsky.social · 24/06/2026
While ground shaking had nothing to do with this failure, since it happened we’ve published evidence for M7+ earthquakes on the nearby Tintina fault (previously thought of as inactive). Begs the question of whether safety margins for heap leach pads/tailings are up to scratch across Yukon/BC…
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Edwin Nissen @faultydata.bsky.social · 24/06/2026
This story was a highlight of the Natural Hazards class I taught at UVic last month (which may have accounted for a few of those downloads). The sea-doo simulation was especially popular!
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Edwin Nissen @faultydata.bsky.social · 27/05/2026
I mean, I can’t deny that being ranked in the top 400 Canadian geoscientists wasn’t a life goal of mine. This is what dreams are made of.
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Edwin Nissen @faultydata.bsky.social · 27/05/2026
What in fresh hell is this
An email, reading:

Dear Edwin Nissen,

We’d like to inform you that Research.com, a leading academic platform for researchers, has just released the 2026 Edition of our Ranking of Best Scientists in the field of Earth Science.

I am sure you will be very happy to learn that you have ranked 394 in Canada and 7867 in the world.

The ranking is based on D-index (Discipline H-index) metric, which only includes papers and citation values for an examined discipline. The ranking includes only leading scientists with D-index of at least 30 for academic publications made in the area of Earth Science.
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Eos @eos.org · 10/05/2026
Wait for it .... 11 seconds and BOOM! Some breathtaking footage from Fuego 🇬🇹 and @boisestate.bsky.social scientists in this great science update on infrasound sensors. eos.org/science-upda...
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Dave Petley @davepetley.bsky.social · 07/05/2026
A wonderful new paper (Shugar et al. 2026) on the 150 million tonne Tracy Arm landslide and tsunami will have profound but challenging implications for the management of risk in fjords around the world in an age of increased tourism and rapid climate change:- eos.org/thelandslide...
eos.org
The 10 August 2025 landslide and tsunami at Tracy Arm fjord
A new paper on the Tracy Arm landslide and tsunami has profound but challenging implications for the management of risk in fjords
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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 06/05/2026
🚨New paper about the second largest tsunami ever recorded, just published in @science.org A short 🧪⚒️🌊 thread #EGU26 @ucalgary.bsky.social @ucalgaryscience.bsky.social doi.org/10.1126/scie...
doi.org
A 481-meter-high landslide-tsunami in a cruise ship–frequented Alaska fjord
Early in the morning of 10 August 2025, a >64 × 106 m3 landslide struck Tracy Arm fjord in Alaska. The landslide was preconditioned by glacial retreat caused by climate change. The resulting 481 m run...
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Edwin Nissen @faultydata.bsky.social · 23/04/2026
We do hope to trench this beautiful scarp one day soon, both to test the inference of normal faulting and get some firm rates and dates on those earthquakes!
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Edwin Nissen @faultydata.bsky.social · 23/04/2026
Important implications for seismic hazard particularly to critical infrastructure (roads, rail, dams, pipelines). The work was led by @theronfinley.bsky.social during his PhD at @seos-uvic.bsky.social w/ help from @lucindaleonard.bsky.social @earthquakeguy.bsky.social and others.
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Edwin Nissen @faultydata.bsky.social · 23/04/2026
The RMT is fault-controlled but was previously considered inactive since around the Eocene. We found clear evidence for repeated surface ruptures along this beautiful Holocene scarp nr Columbia Lake BC. We interpret them as normal faulting driven by gravitational collapse of the Canadian cordillera
A fault scarp on an alluvial fan with mountains behind
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Edwin Nissen @faultydata.bsky.social · 23/04/2026
A bit late posting this but it’s Earth Day and our new paper on the Rocky Mountain Trench, one of North America’s most prominent topographic lineaments, recently came out in JGR. agupubs.onlinelibrary.wiley.com/doi/abs/10.1...
NASA satellite photo of the Canadian Rockies with a large scour down the center. This is the Rocky Mountain Trench.
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Edwin Nissen @faultydata.bsky.social · 20/04/2026
Urban areas subsidise rural areas in millions of ways. It’s not in your interest to turn this into a competition!
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Edwin Nissen @faultydata.bsky.social · 02/04/2026
Insect-based cat food just came on the market here… unfortunately our cat wasn’t a fan but it shows the way. Plus our cat is most definitely a baby substitute so the relative footprint is pretty small!
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Edwin Nissen @faultydata.bsky.social · 01/04/2026
Very cool, but a missed opportunity to call these events “flip floppers”
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Edwin Nissen @faultydata.bsky.social · 01/04/2026
I presume you’ve nothing against indoor cats? That’s the norm here in Canada, with bears, cougars etc. out to eat them
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Edwin Nissen @faultydata.bsky.social · 06/03/2026
I’m quoted in this excellent Scientific American article on the incredible Zagros mountains, the focus of much of my PhD and postdoc research. The Zagros’s unique tectonic history explains the Gulf’s rich oil and gas reserves and ultimately the Gulf itself, including the narrow Strait of Hormuz.
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Edwin Nissen @faultydata.bsky.social · 01/03/2026
As healthy as a cake can be. No need for the ring shenanigans www.theguardian.com/food/2021/ma...
theguardian.com
Ciambellone di ricotta e limon – ricotta and lemon ring cake – by Rachel Roddy
The ricotta gives this hassle-free bake a moist, creamy depth, complemented by mood-lifting lemon – perfect at any time
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Theron Finley @theronfinley.bsky.social · 23/02/2026
The Canadian Quaternary Association (CANQUA) Biennial Meeting is taking place at McGill University in Montreal, June 3-6, 2026. Abstracts are due March 6th! event.fourwaves.com/canqua2026/p... If you work on geohazards, please consider submitting an abstract to our session:
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History of Geology @historyofgeology.bsky.social · 21/02/2026
February 21, 1993, died on this day aged 105 years, Danish seismologist Inge Lehman. She discovered that the Earth has a inner core announcing it in 1936 with the shortest title for a paper ever: P' - after the seismic discontinuity between core and mantle shown by the P-waves
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Oxford Earth Sciences @oxuniearthsci.bsky.social · 20/02/2026
The Department of Earth Sciences and St Peter's College are recruiting an Associate Professor (or Professor) in Earth Surface Processes to join our thriving academic community! earth.web.ox.ac.uk/vacancies
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John Ristau 🇨🇦 🇳🇿 @earthquakenz.bsky.social · 20/02/2026
A thread for the 15-year anniversary of the 2011 Christchurch earthquake. I won’t have a chance to post it on the day, so I’m doing it a couple days early. Note that the work I’m posting was carried out by many brilliant people. 1/
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Edwin Nissen @faultydata.bsky.social · 20/02/2026
The Archers. It’s been running since 1951 and is past 20,000 episodes
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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 19/02/2026
⚒️🧪 friends, let's make sure @agu.org knows we all want them to get completely off the Nazi cesspool. 3...2...1....go! (that means like and reskeet this!) @agucryo.bsky.social @agu-h3s.bsky.social @aguseismology.bsky.social @agucatchhydro.bsky.social @aguscipolicy.bsky.social @gec-agu.bsky.social
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Edwin Nissen @faultydata.bsky.social · 19/02/2026
The inevitable Keely Hodgkinson–Femke Bol showdown is going to be spectacular!
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Edwin Nissen @faultydata.bsky.social · 13/02/2026
Yeah I meant taking the burden off grad students who have enough on their plate. Agree that senior PhDs should be reviewing too though
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Edwin Nissen @faultydata.bsky.social · 13/02/2026
Grad student-led papers should be included too
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ev9 @ev9999.bsky.social · 31/01/2026
⚒️🧪Fiery Mud Volcano Eruption! The Daşmərdan (Dashmardan) mud volcano in Azerbaijan erupted ~16:50 on the 30th Jan 2026. The eruption lasted ~15 mins and was accompanied by a pillar of flame several hundred meters high. Daşmərdan had previous documented eruptions in 1866, 1954, 1976, 1986 and 2011.
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Edwin Nissen @faultydata.bsky.social · 30/01/2026
The lack of obvious internal deformation *within* the landslide is amazing. Must be a very simple failure plane?
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Edwin Nissen @faultydata.bsky.social · 28/01/2026
This is great. That orange crosswalk is ^so^ dangerous. I once saw a driver blast through while a pedestrian was mid way across, missing causing a fatality by inches.
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John Cassidy @earthquakeguy.bsky.social · 26/01/2026
326 years ago tonight (9 p.m. Jan. 26, 1700) a M~9 Cascadia subduction earthquake rocked the west coast from #VancouverIsland to northern California. The Juan de Fuca Plate slipped up to 20 m, causing a large tsunami, strong shaking and landslides www.earthquakescanada.nrcan.gc.ca/historic-his... ⚒️🧪
Colourful map showing the tectonic plates of the Cascadia subduction zone from Northern California to northern Vancouver Island.Cartoon map showing the tectonic setting of the Cascadia subduction zone, where the Juan de Fuca plate slips beneath the North American Plate from California to northern Vancouver Island.
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Edwin Nissen @faultydata.bsky.social · 24/01/2026
Thank you Dave and Victoria Council for making such great progress on safe cycling infrastructure across YYJ. There’s still a long way to go but it is truly appreciated 🙏
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