James Dalziel
@j-dalziel.bsky.social
Volcanologist, Earth Risk Research Lead at WTW, drummer, medieval re-enactor, music lover, gearhead, pub enthusiast & sci-fi nerd. Posting news & research relating to geological hazards, science, technology & the environment.
Reposted by James Dalziel
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
November 10, 2025 at 6:56 AM
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposted by James Dalziel
When the Earth Moves: 25 Years of Probabilistic Fault Displacement Hazards eos.org/editors-vox/...
When the Earth Moves: 25 Years of Probabilistic Fault Displacement Hazards - Eos
Surface ruptures causing earthquakes pose risks to infrastructure and human lives, but advances in models and data in the last few decades have improved our ability to mitigate their effects.
eos.org
October 17, 2025 at 7:58 PM
When the Earth Moves: 25 Years of Probabilistic Fault Displacement Hazards eos.org/editors-vox/...
Seismologists & risk modellers are always aiming to better understand relationships between quakes on major faults. This Science article, based on Goldfinger et al. (2025), uses palaeoseismology to find possible stress triggering between the Cascadia subduction zone & northern San Andreas fault:
Big U.S. West Coast earthquakes could come as a one-two punch
Cascadia and San Andreas fault zones appear to generate synchronized earthquakes
www.science.org
October 9, 2025 at 11:45 AM
Seismologists & risk modellers are always aiming to better understand relationships between quakes on major faults. This Science article, based on Goldfinger et al. (2025), uses palaeoseismology to find possible stress triggering between the Cascadia subduction zone & northern San Andreas fault:
This brilliant initiative & resulting White Paper gives important insights into the geohazards affecting Indonesia, challenges & research priorities for better understanding of hazard, & recommended solutions to address challenges, strengthen resilience & improve disaster risk reduction.
Natural hazard disasters in Indonesia are responsible for the loss of hundreds to thousands of lives each year and costs the national economy US$1 to US$3 billion.
Effective disaster risk reduction across the spectrum of geohazards depends on decisions grounded in the best available earth science.
Effective disaster risk reduction across the spectrum of geohazards depends on decisions grounded in the best available earth science.
September 30, 2025 at 3:16 PM
This brilliant initiative & resulting White Paper gives important insights into the geohazards affecting Indonesia, challenges & research priorities for better understanding of hazard, & recommended solutions to address challenges, strengthen resilience & improve disaster risk reduction.
Reposted by James Dalziel
Great to see @mikeaclare.bsky.social @noc.ac.uk quoted in this piece in the Guardian today www.theguardian.com/news/2025/se... about the Hunga Volcano eruption and the subsequent telecommunications outage in 2022.
Extremely offline: what happened when a Pacific island was cut off from the internet | Samanth Subramanian
A colossal volcanic eruption in January 2022 ripped apart the underwater cables that connect Tonga to the world – and exposed the fragility of 21st-century life
www.theguardian.com
September 30, 2025 at 5:51 AM
Great to see @mikeaclare.bsky.social @noc.ac.uk quoted in this piece in the Guardian today www.theguardian.com/news/2025/se... about the Hunga Volcano eruption and the subsequent telecommunications outage in 2022.
Reposted by James Dalziel
The Matai’an landslide dam in eastern Taiwan has failed this afternoon (eos.org/thelandslide...), flooding Guangfu, about 15 km downstream focustaiwan.tw/society/2025.... Even in the middle of a typhoon, the resulting flood produced a detectable seismic signal at stations ~40 km away.
September 23, 2025 at 5:21 PM
The Matai’an landslide dam in eastern Taiwan has failed this afternoon (eos.org/thelandslide...), flooding Guangfu, about 15 km downstream focustaiwan.tw/society/2025.... Even in the middle of a typhoon, the resulting flood produced a detectable seismic signal at stations ~40 km away.
This article, based on a recent Seismological Research Letters paper from scientists at the Statewide California Earthquake Center (SCEC), examines occurrence of supershear earthquakes, the need for updated hazard planning & suitable building design to reflect risks: dornsife.usc.edu/news/stories...
'Supershear' earthquakes a major threat to California, say scientists
USC Dornsife researchers say powerful, fast-moving quakes will strike the Golden State, urge stronger building codes and better monitoring
dornsife.usc.edu
September 24, 2025 at 2:41 PM
This article, based on a recent Seismological Research Letters paper from scientists at the Statewide California Earthquake Center (SCEC), examines occurrence of supershear earthquakes, the need for updated hazard planning & suitable building design to reflect risks: dornsife.usc.edu/news/stories...
Reposted by James Dalziel
Yet another Nat Cat job? Actually, we're searching for TWO experts, specialized in tropical cyclones or earthquakes. US or UK, remote work definitely an option. Great job for an ECR physical scientist looking to join the insurance/reinsurance industry! eedu.fa.em3.oraclecloud.com/hcmUI/Candid...
Natural Catastrophe Analyst - Earthquake/Hurricane Specialist
An exciting opportunity to join an established research network team at Willis (a WTW business), helping clients understand and manage risk while shaping the Willis “view of risk.” Using your scientif...
eedu.fa.em3.oraclecloud.com
September 15, 2025 at 6:24 PM
Yet another Nat Cat job? Actually, we're searching for TWO experts, specialized in tropical cyclones or earthquakes. US or UK, remote work definitely an option. Great job for an ECR physical scientist looking to join the insurance/reinsurance industry! eedu.fa.em3.oraclecloud.com/hcmUI/Candid...
Reposted by James Dalziel
🌋 Excited to share my new essay in Aeon: one of the most underappreciated global risks isn’t an asteroid or supervolcano—it’s the eruptions we don’t see coming:
The science of volcanoes and their relationship with the climate is hard to keep up with. Why do some volcanoes give us little warning before they blow? Are we ignoring the next big eruption?
Hidden volcanoes: are we ignoring the next big eruption? | Aeon Essays
The next global disaster may be triggered by a catastrophic eruption. How can we prepare for the fire beneath our feet?
buff.ly
September 16, 2025 at 10:40 AM
🌋 Excited to share my new essay in Aeon: one of the most underappreciated global risks isn’t an asteroid or supervolcano—it’s the eruptions we don’t see coming:
Reposted by James Dalziel
Volcano alert: Scientists discover a signal that could transform early warning systems - the role of shear-wave splitting: www.earth.com/news/volcano...
Volcano alert: Scientists discover a signal that could transform early warning systems
Detecting a signal within earthquake waves called shear-wave splitting may improve early warning systems for volcano eruptions.
www.earth.com
August 27, 2025 at 11:21 AM
Volcano alert: Scientists discover a signal that could transform early warning systems - the role of shear-wave splitting: www.earth.com/news/volcano...
This paper by Meredith et al. (2025) examines global city exposure to volcanic hazards, using metrics such as population and distance to GVP Holocene volcanoes to quantify and rank cities at risk. This data has also been visualised through a web app. nhess.copernicus.org/articles/25/...
Cities near volcanoes: which cities are most exposed to volcanic hazards?
Abstract. Cities near volcanoes expose dense concentrations of people, buildings, and infrastructure to volcanic hazards. Identifying cities globally that are exposed to volcanic hazards helps guide l...
nhess.copernicus.org
August 15, 2025 at 3:09 PM
This paper by Meredith et al. (2025) examines global city exposure to volcanic hazards, using metrics such as population and distance to GVP Holocene volcanoes to quantify and rank cities at risk. This data has also been visualised through a web app. nhess.copernicus.org/articles/25/...
Reposted by James Dalziel
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. 🧪⚒️
July 31, 2025 at 10:42 AM
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. 🧪⚒️
Reposted by James Dalziel
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...
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...
July 31, 2025 at 3:55 PM
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...
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...
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...
theconversation.com/hurricane-he...
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.
theconversation.com
July 3, 2025 at 12:23 PM
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...
theconversation.com/hurricane-he...
Reposted by James Dalziel
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...
⚒️🧪
⚒️🧪
June 22, 2025 at 3:23 PM
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...
⚒️🧪
⚒️🧪
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.
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
www.theguardian.com
June 19, 2025 at 10:20 AM
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.
Reposted by James Dalziel
The VAAC report for the Etna eruption today mentions a plume reaching 6,500 m / ~21,000 feet.
A live feed of the current eruption of Etna can be found here: www.youtube.com/live/pO2zFFe... 🌋⚒️
June 2, 2025 at 10:56 AM
The VAAC report for the Etna eruption today mentions a plume reaching 6,500 m / ~21,000 feet.
Reposted by James Dalziel
Pyroclastic flows at Etna have been confirmed by INGV ⚒️🌋
June 2, 2025 at 9:56 AM
Pyroclastic flows at Etna have been confirmed by INGV ⚒️🌋
Reposted by James Dalziel
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
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
May 21, 2025 at 10:49 AM
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
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
Reposted by James Dalziel
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...
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...
May 22, 2025 at 7:07 AM
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...
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...
Reposted by James Dalziel
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
May 16, 2025 at 7:51 AM
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
Reposted by James Dalziel
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...
youtube.com/@sagaingeart...
May 15, 2025 at 5:42 PM
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...
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!
I am speechless...
>> First fault movement ever filmed. M7.9 surface rupture filmed near Thazi, Myanmar
m.youtube.com/watch?v=77ub...
>> First fault movement ever filmed. M7.9 surface rupture filmed near Thazi, Myanmar
m.youtube.com/watch?v=77ub...
First fault movement ever filmed. M7.9 surface rupture filmed near Thazi, Myanmar
YouTube video by 2025 Sagaing Earthquake Archive
m.youtube.com
May 14, 2025 at 10:49 AM
Incredible footage of sudden ground displacement from the recent Myanmar earthquake. It took me a few watches to understand & believe what I was seeing!
Reposted by James Dalziel
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
You can check out the full hashtag#EGU25 programme on the EGU website www.egu25.eu
April 28, 2025 at 9:46 AM
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
You can check out the full hashtag#EGU25 programme on the EGU website www.egu25.eu
Reposted by James Dalziel
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
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
April 23, 2025 at 10:54 AM
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
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