James Dalziel

Crescent city river gauge record

Just to illustrate how long waves from a #tsunami can keep going, this is a tide gauge record from Crescent City CA (known for its sensitivity to tsunami waves due to bathymetric and resonance effects) showing significant wave activity still continues 24+ hours after their first arrival. 🧪⚒️

A National Oceanic & Atmospheric Administration (NOAA) diagram illustrating how tsunami wave information in the deep ocean is transmitted to tsunami warning centers (right)

Kamchatka earthquake highlights the advances in tsunami early warning systems 🌊 🛰️

BGS Prof David Tappin, Marine Geologist & tsunami expert explains how the Kamchatka event highlighted the improved mitigation measures now in place.

www.bgs.ac.uk/news/kamchat...

Hurricane Helene set up future disasters, from landslides to flooding – cascading hazards like these are now upending risk models Risk models can’t rely just on the past anymore. A team of geoscientists suggests new ways to forecast evolving hazards in real time as cascading disaster risk worsens.

This article, based on Yanites et al. (2025) in Science, discusses how hazardous events such as earthquakes, wildfires, & storms accelerate erosion & sediment transport, increasing sensitivity & risk of cascading hazards such as landslides & floods:
theconversation.com/hurricane-he...

Maps showing how the June 23, 2010 M5 earthquake near Val des Bois, Quebec, was felt across eastern North America (to a distance of nearly 1000 km). Map on the right is a closeup of felt shaking reports from the epicentral region where some damage occurred and landslides were triggered.

Photo of a red barn that was impacted by a landslide following a M5 earthquake in Quebec. Brown soils outline the landslide, with green grassy fields and trees in the background.

Earthquakes in eastern #Canada? June 23, 2010 - a damaging M5 #earthquake in western Québec was felt in Ontario, #Québec and as far away as Washington DC. It triggered landslides and produced the strongest shaking ever felt in #Ottawa (~60 km away): earthquakescanada.nrcan.gc.ca/pprs-pprp/pu...
⚒️🧪

With an eruption at Mt. Etna earlier this month also sending ash 6.4km high, leading to warnings for aviation, volcanoes remain a constant but often overlooked risk for tourism, supply chains & the maritime sector, as well as local infrastructure.

Bali flights cancelled after Indonesian volcano spews 10km-high ash tower Mount Lewotobi Laki-Laki on the island of Flores, east of Bali, erupted on Tuesday afternoon, leading to several airlines cancelling flights

On 17-18th June, explosive eruptions at Mt. Lewotobi Laki-Laki on the Indonesian island of Flores sent ash >11.5km above sea level. This highlights volcanic hazards on varying scales; pyroclastic flows & lahars threatening local communities, & ash leading to flight cancellations & delays.

The VAAC report for the Etna eruption today mentions a plume reaching 6,500 m / ~21,000 feet.

Pyroclastic flows at Etna have been confirmed by INGV ⚒️🌋

Pleased to announce the 4th major release of the @wsmproject.bsky.social, the biggest update of the database since the project began.

With thousands of new data, the 2025 WSM brings the most comprehensive picture yet of Earth's present-day stress field.

#Geomechanics

W: www.world-stress-map.org

Google Earth image of the site of the 21 May 2025 quick clay landslide at Sainte Monique in Canada.

A drone image of the site of the 21 May 2025 quick clay landslide at Sainte Monique in Canada. Still from a drobe video posted to Youtube by Radio-Canada Info.

On 21 May 2025, a house was destroyed by a dramatic quick clay landslide at Sainte Monique in Quebec, Canada. Fortunately, no-one was killed:-
eos.org/thelandslide...
There is also excellent drone footage of the aftermath on Youtube, posted by Radio-Canada Info:-
www.youtube.com/watch?v=G4JB...

In 2024, Europe saw average to slightly above-average fire danger for most of the year, with the highest values in September. Around 110,000 hectares burnt in Portugal that month, accounting for around a quarter of the overall total burnt area in Europe for the year. bit.ly/4ctJySA #ESOTC2024 #C3S

Photo of a road, the asphalt is torn apart and cracked from the bottom of the image into the distance. This is a result of an earthquake surface rupture. The road leads to a gate with white walls and some grass in front of it. Overcast sky.

This is a photo of the surface rupture we saw in the webcam footage of the Myanmar #earthquake. The webcam was positioned on the opposite side behind the gate. Source is the YouTube channel that also posted the footage. 🧪⚒️

youtube.com/@sagaingeart...

Incredible footage of sudden ground displacement from the recent Myanmar earthquake. It took me a few watches to understand & believe what I was seeing!

We hope everyone attending European Geosciences Union (EGU) 2025 has a fantastic week and don't miss the following COMET talks and posters.

You can check out the full hashtag#EGU25 programme on the EGU website www.egu25.eu

SEISMIC INFORMATION : SEA OF MARMARA (WESTERN TURKEY) 23 APRIL 2025 09:49

The following preliminary information is available for this earthquake:

LAT/LONG : 40.840° North / 28.142° East
DEPTH : 10 km
MAGNITUDE : 6.2 Mw
LOCALITY : Sea of Marmara, 75 km west of Istanbul, Turkey

USGS provides interactive ground motion maps for 14 earthquake scenarios on the Elsinore fault, ranging from M 6.8 to M 7.7 (many combinations of different fault sections) so you can see what shaking it is capable of producing in the future earthquake.usgs.gov/scenarios/ca...

🫨 Yeah, we felt it, too.

Today's #earthquake occurred near the Elsinore Fault Zone and reached a magnitude of 5.2, according to scientists with @igpp-sio.bsky.social. You can view the seismic wavefield animation by Scripps Oceanography PhD candidate John Rekoske.

Friday's M7.7 Mandalay, Myanmar earthquake - do we need to rethink… | Stephen Hicks Friday's M7.7 Mandalay, Myanmar earthquake - do we need to rethink earthquake hazard models? Hours after Friday's earthquake, media reports focussed on the…

Friday's M7.7 Mandalay, Myanmar earthquake - do we need to rethink earthquake hazard models? A little summary and discussion - hopefully in relative simple terms - by me, over on LinkedIn: www.linkedin.com/posts/sphick...

Earthquakes in Thailand—Is Bangkok at Risk?

This effect has been seen in Bangkok before, following events in 2007, 2011 & 2014 around northern Thailand, Laos & Myanmar. Another famous example of basin amplification was seen in Mexico City in 1985, when a quake ~350km away caused $3-4 billion USD in damage. (2/2) www.verisk.com/blog/earthqu...

Although the effects of today's Sagaing quake are most severe in places like Mandalay, shaking in Bangkok may seem surprising given it's ~1000km from the epicentre. This is due to long period ground motion, amplified by a deep sedimentary basin comprised of soft alluvial clay. (1/2)

Ash plume heights, hazards, and ashfall projections, oh my! What do volcanologists learn from ashfall maps? How do volcanologists determine the height of eruptive plumes from Yellowstone’s past explosive eruptions? Ironically, you have to dig into the ground to get the answer.

Shared on behalf of the USGS: YVO Yellowstone Caldera Chronicles for Mar 24, 2025
#volcano #earthscience #geology

Ash plume heights, hazards, and ashfall projections, oh my! What do volcanologists learn from ashfall maps.

www.usgs.gov/observatorie...

WATCH: Moment cliff collapses and rocks crash onto beach Video footage has captured the moment a rocks came crashing down from a cliff in Charmouth

www.dorsetecho.co.uk/news/2501107...

NLL-SSST-coherence high-precision earthquake location catalog for the 2025 #Santorini #Amorgos #earthquake swarm.
Based on data from Institute of Geodynamics of the National Observatory of Athens (NOA-IG).
Download & details: doi.org/10.5281/zeno...

IMO's models suggest the volume of magma accumulated beneath Svartsengi has exceeded the amount present before the eruption that began on November 20, 2024.
It is anticipated that an eruption may start in Sundhnúksgígaröð with very short warning. Below latest IMO news:

As would I! Many years ago during my MSc I did exactly that for seismicity leading up to the 2011 El Hierro submarine eruption, & found it was extremely useful for tracking magmatic movements & differentiating between intrusions.

The article doesn't address this directly, but as it states it can detect smaller magnitude events than traditional methods, I'd have thought a lower magnitude of completeness could affect b-value? An interesting question, but I'm unfortunately far more of a volcanologist than a seismologist!

Artificial intelligence is proving a game changer in tracking the Santorini earthquake swarm - British Geological Survey An online tool that shows which roads are most likely to cause river pollution is being expanded to assess pollution from agricultural areas.

With geoscientists keeping a close eye on the seismicity around Santorini over the past couple of weeks, this work by the BGS using machine learning to enhance detection & short-term forecasting for advising emergency services & at-risk communities is fascinating: www.bgs.ac.uk/news/artific...

A brilliant and comprehensive record of the volcanoes dotted around Europe, complete with their various characteristics and unique hazards to be aware of.

NASA Radar Imagery Reveals Details About Los Angeles-Area Landslides - NASA Analysis of data from NASA radar aboard an airplane shows that the decades-old active landslide area on the Palos Verdes Peninsula has expanded.

NASA's UAVSAR radar has detected that parts of the Palos Verdes Peninsula in Los Angeles County are sliding toward the ocean at rates up to 10 cm per week, following heavy rainfall in 2023 and 2024.

⚒️🧪 #geology #geohazards #remotesensing

Geoscience Australia releases high-risk updated earthquake zones Geoscience Australia says Darwin and the Latrobe Valley are more likely to experience "strong ground shaking". The latter is among the sites the Coalition has identified as a potential home for a nucl...

For context, Geoscience Australia have updated their NSHA (National Seismic Hazard Assessment) Map, and two areas have been classified as higher hazard than the previous map from 5 years earlier. These areas don't suddenly have a higher chance of earthquake activity. Hazard ratings aren't prediction