Robin Lacassin
@rlacassin.bsky.social
Institut de Physique du Globe de Paris (IPGP - CNRS). Geology, tectonics, earthquakes, hazard epistemology & com. ⚒️ 🧪
Also: @RobinLacassin@qoto.org
https://www.ipgp.fr/~lacassin/RL-TectoniqueIPGP
https://tectoldies.mystrikingly.com/
Also: @RobinLacassin@qoto.org
https://www.ipgp.fr/~lacassin/RL-TectoniqueIPGP
https://tectoldies.mystrikingly.com/
Pinned
Robin Lacassin
@rlacassin.bsky.social
· Feb 27
In support of our US scientific colleagues, and to defend #science as a common good, everywhere, actions are currently being organized in France. #standupforscience2025 ⚒️ 🧪
To be informed, follow:
@standupforscifr.bsky.social
@sufs-paris-rp.bsky.social (Paris and IDF)
standupforscience.fr
To be informed, follow:
@standupforscifr.bsky.social
@sufs-paris-rp.bsky.social (Paris and IDF)
standupforscience.fr
Reposted by Robin Lacassin
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 Robin Lacassin
⚒️ 🧪
A M6.8 earthquake struck offshore Japan today - another large earthquake from the subduction zone that produced two recent great earthquakes. The earthquake was preceded by a "cascade up": foreshocks progressively increasing in maximum magnitude.
What do we know? What might happen next?
A M6.8 earthquake struck offshore Japan today - another large earthquake from the subduction zone that produced two recent great earthquakes. The earthquake was preceded by a "cascade up": foreshocks progressively increasing in maximum magnitude.
What do we know? What might happen next?
M6.8 earthquake offshore Japan preceded by upward cascade of foreshocks
What do we know about seismic hazard in the Japan-Kuril subduction zone?
earthquakeinsights.substack.com
November 9, 2025 at 6:41 PM
⚒️ 🧪
A M6.8 earthquake struck offshore Japan today - another large earthquake from the subduction zone that produced two recent great earthquakes. The earthquake was preceded by a "cascade up": foreshocks progressively increasing in maximum magnitude.
What do we know? What might happen next?
A M6.8 earthquake struck offshore Japan today - another large earthquake from the subduction zone that produced two recent great earthquakes. The earthquake was preceded by a "cascade up": foreshocks progressively increasing in maximum magnitude.
What do we know? What might happen next?
Reposted by Robin Lacassin
📰 Dans @lemonde.fr, notre collègue Harsha S. Bhat (laboratoire de #géologie ENS) explique comment l'étude du tremblement de terre en Birmanie a permis d'affiner les modèles sismiques.
www.lemonde.fr/sciences/art...
www.lemonde.fr/sciences/art...
Le tremblement de terre en Birmanie en mars a permis d’affiner les modèles des scientifiques
En plus d’être particulièrement étendu, ce séisme a présenté un front en « supercisaillement », lié à une vitesse de rupture très élevée. Dans « Science », une édition spéciale présente une série d’ar...
www.lemonde.fr
November 6, 2025 at 2:11 PM
📰 Dans @lemonde.fr, notre collègue Harsha S. Bhat (laboratoire de #géologie ENS) explique comment l'étude du tremblement de terre en Birmanie a permis d'affiner les modèles sismiques.
www.lemonde.fr/sciences/art...
www.lemonde.fr/sciences/art...
Reposted by Robin Lacassin
NEW: Hurricane Melissa was such a monstrous tempest that it was literally shaking the Earth as far away as Florida, where seismometers picked up its stormquakes.
Here’s how seismometers can also shine a light on hurricanes long gone.
Me @sciam.bsky.social www.scientificamerican.com/article/seis...
Here’s how seismometers can also shine a light on hurricanes long gone.
Me @sciam.bsky.social www.scientificamerican.com/article/seis...
Hurricane Melissa Literally Made the Earth Shake Hundreds of Miles Away
Seismometers picked up the ferocious winds and waves of Hurricane Melissa, showing how the tools can be used to better understand storms today and those from the past
www.scientificamerican.com
October 30, 2025 at 5:28 PM
NEW: Hurricane Melissa was such a monstrous tempest that it was literally shaking the Earth as far away as Florida, where seismometers picked up its stormquakes.
Here’s how seismometers can also shine a light on hurricanes long gone.
Me @sciam.bsky.social www.scientificamerican.com/article/seis...
Here’s how seismometers can also shine a light on hurricanes long gone.
Me @sciam.bsky.social www.scientificamerican.com/article/seis...
This is a fake image, probably AI generated. Be careful. Don’t repost.
Very sad to see misinformation so frequently after disasters.
Very sad to see misinformation so frequently after disasters.
October 29, 2025 at 4:31 PM
This is a fake image, probably AI generated. Be careful. Don’t repost.
Very sad to see misinformation so frequently after disasters.
Very sad to see misinformation so frequently after disasters.
Reposted by Robin Lacassin
Remember when social media was a useful tool for assessing damage post-disaster, instead of having to fish through fake photos made with AI garbage?
That was nice.
That was nice.
Black River hospital Jamaica #hurricane #melissa 🇯🇲
October 29, 2025 at 3:45 PM
Remember when social media was a useful tool for assessing damage post-disaster, instead of having to fish through fake photos made with AI garbage?
That was nice.
That was nice.
Reposted by Robin Lacassin
Update: Hurricane Melissa has made landfall in southwestern Jamaica — and has tied the all-time record for strongest Atlantic basin hurricane landfall.
Hurricane Melissa will be a generational-scale climate disaster and will require an international response to help Jamaicans recover.
Hurricane Melissa will be a generational-scale climate disaster and will require an international response to help Jamaicans recover.
October 28, 2025 at 5:09 PM
Update: Hurricane Melissa has made landfall in southwestern Jamaica — and has tied the all-time record for strongest Atlantic basin hurricane landfall.
Hurricane Melissa will be a generational-scale climate disaster and will require an international response to help Jamaicans recover.
Hurricane Melissa will be a generational-scale climate disaster and will require an international response to help Jamaicans recover.
Reposted by Robin Lacassin
#Melissa vient de toucher terre avec une pression centrale de 892 hPa à égalité avec le cyclone historique Labor Day de 1935.
C’est donc un record absolu pour le bassin Atlantique au moment de l’atterrissage (landfall)
1/2
C’est donc un record absolu pour le bassin Atlantique au moment de l’atterrissage (landfall)
1/2
October 28, 2025 at 2:33 PM
#Melissa vient de toucher terre avec une pression centrale de 892 hPa à égalité avec le cyclone historique Labor Day de 1935.
C’est donc un record absolu pour le bassin Atlantique au moment de l’atterrissage (landfall)
1/2
C’est donc un record absolu pour le bassin Atlantique au moment de l’atterrissage (landfall)
1/2
Disaster underway in #Jamaica.
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
October 28, 2025 at 2:59 PM
Disaster underway in #Jamaica.
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
Reposted by Robin Lacassin
Hurricane #Melissa strengthened to a powerful Category 5 on Monday, with destuctive winds and major winds expected to intensify in Jamaica.
Expected to make landfall on Tuesday, Melissa is set to be the strongest hurricane in recent history to directly hit the island.
Expected to make landfall on Tuesday, Melissa is set to be the strongest hurricane in recent history to directly hit the island.
October 28, 2025 at 10:01 AM
Hurricane #Melissa strengthened to a powerful Category 5 on Monday, with destuctive winds and major winds expected to intensify in Jamaica.
Expected to make landfall on Tuesday, Melissa is set to be the strongest hurricane in recent history to directly hit the island.
Expected to make landfall on Tuesday, Melissa is set to be the strongest hurricane in recent history to directly hit the island.
Reposted by Robin Lacassin
From a crewmember on yesterday's Teal 74 mission into now-Category 5 Hurricane #Melissa. As clear of an eye as you will see in the Atlantic basin.
October 27, 2025 at 4:11 PM
From a crewmember on yesterday's Teal 74 mission into now-Category 5 Hurricane #Melissa. As clear of an eye as you will see in the Atlantic basin.
Reposted by Robin Lacassin
Melissa now up to 175mph sustained winds (150kt), with a central pressure of 906mb.
That's among the 10 or 12 strongest hurricanes ever measured in the Atlantic basin, back to 1851. Regardless of whether they made landfall.
Melissa is likely to make landfall in Jamaica at near-peak strength.
That's among the 10 or 12 strongest hurricanes ever measured in the Atlantic basin, back to 1851. Regardless of whether they made landfall.
Melissa is likely to make landfall in Jamaica at near-peak strength.
Atlantic Hurricane Melissa Intermediate Advisory Number 25a
...CATEGORY 5 MELISSA MOVING SLOWLY WEST-NORTHWESTWARD AND EXPECTED TO TURN NORTHWARD LATER TODAY... ...CATASTROPHIC AND LIFE-THREATENING WINDS, FLOODING, AND STORM SURGE EXPECTED ON JAMAICA TONIGHT AND EA...
Additional Details Here.
...CATEGORY 5 MELISSA MOVING SLOWLY WEST-NORTHWESTWARD AND EXPECTED TO TURN NORTHWARD LATER TODAY... ...CATASTROPHIC AND LIFE-THREATENING WINDS, FLOODING, AND STORM SURGE EXPECTED ON JAMAICA TONIGHT AND EA...
Additional Details Here.
October 27, 2025 at 5:44 PM
Melissa now up to 175mph sustained winds (150kt), with a central pressure of 906mb.
That's among the 10 or 12 strongest hurricanes ever measured in the Atlantic basin, back to 1851. Regardless of whether they made landfall.
Melissa is likely to make landfall in Jamaica at near-peak strength.
That's among the 10 or 12 strongest hurricanes ever measured in the Atlantic basin, back to 1851. Regardless of whether they made landfall.
Melissa is likely to make landfall in Jamaica at near-peak strength.
Reposted by Robin Lacassin
The monster eye at the center of a still strengthening Hurricane Melissa.
October 27, 2025 at 4:54 PM
The monster eye at the center of a still strengthening Hurricane Melissa.
A Mw 6.5 #earthquake offshore #Guadeloupe island. Epicenter relatively close to trench. Mechanism is normal faulting with fault plane parallel to trench strike.
Given its depth (~13km), location, mechanism, I suspect it happened into the subducting oceanic crust beneath the accretionary prism. ⚒️
Given its depth (~13km), location, mechanism, I suspect it happened into the subducting oceanic crust beneath the accretionary prism. ⚒️
Mw=6.5, LEEWARD ISLANDS (Depth: 13 km), 2025/10/27 12:38:40 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us6000rjq8
October 27, 2025 at 2:17 PM
A Mw 6.5 #earthquake offshore #Guadeloupe island. Epicenter relatively close to trench. Mechanism is normal faulting with fault plane parallel to trench strike.
Given its depth (~13km), location, mechanism, I suspect it happened into the subducting oceanic crust beneath the accretionary prism. ⚒️
Given its depth (~13km), location, mechanism, I suspect it happened into the subducting oceanic crust beneath the accretionary prism. ⚒️
Reposted by Robin Lacassin
October 27, 2025 at 11:54 AM
Reposted by Robin Lacassin
A remarkable, and ominous, satellite snapshot this evening of Hurricane #Melissa as it continues to move very slowly westward just south of #Jamaica. The storm will likely further strengthen into a Category 5 storm before turning northward & making landfall in Jamaica on Tue.
October 27, 2025 at 12:56 AM
Reposted by Robin Lacassin
This evening's update from the U.S. National Hurricane Center on #Melissa is ominous, and explicitly mentions: "catastrophic and life-threatening flash flooding...extensive infrastructural damage...and potentially prolonged isolation of communities" in both Jamaica & Haiti.
October 25, 2025 at 9:27 PM
This evening's update from the U.S. National Hurricane Center on #Melissa is ominous, and explicitly mentions: "catastrophic and life-threatening flash flooding...extensive infrastructural damage...and potentially prolonged isolation of communities" in both Jamaica & Haiti.
Reposted by Robin Lacassin
📢 Alerte : Melissa en approche de la Jamaïque
L'ouragan s’intensifie fortement est actuellement en catégorie 4: la pression mesurée lors du dernier passage d’un avion de reconnaissance s’établit à 939,9 hPa à 19 h19 TU (en forte baisse après 953 hPa à 15 hTU).
L'ouragan s’intensifie fortement est actuellement en catégorie 4: la pression mesurée lors du dernier passage d’un avion de reconnaissance s’établit à 939,9 hPa à 19 h19 TU (en forte baisse après 953 hPa à 15 hTU).
October 26, 2025 at 9:10 PM
📢 Alerte : Melissa en approche de la Jamaïque
L'ouragan s’intensifie fortement est actuellement en catégorie 4: la pression mesurée lors du dernier passage d’un avion de reconnaissance s’établit à 939,9 hPa à 19 h19 TU (en forte baisse après 953 hPa à 15 hTU).
L'ouragan s’intensifie fortement est actuellement en catégorie 4: la pression mesurée lors du dernier passage d’un avion de reconnaissance s’établit à 939,9 hPa à 19 h19 TU (en forte baisse après 953 hPa à 15 hTU).
October 26, 2025 at 9:11 PM
Reposted by Robin Lacassin
Basic principle: any use of AI by authors must be declared, and justified, and must follow the rules detailed in our guidelines 👇
Respect transparency and #openscience #ethics
Respect transparency and #openscience #ethics
At Tektonika #DOAJ we now have guidelines about #AI usage. We encourage our authors and reviewers to carefully read them. ⚒️ 🧪
We will explain those guidelines and comment on AI usage in our next editorial.
tektonika.online/index.php/ho...
We will explain those guidelines and comment on AI usage in our next editorial.
tektonika.online/index.php/ho...
October 24, 2025 at 11:44 AM
Basic principle: any use of AI by authors must be declared, and justified, and must follow the rules detailed in our guidelines 👇
Respect transparency and #openscience #ethics
Respect transparency and #openscience #ethics
Reposted by Robin Lacassin
A very important point for our reviewers: It's strictly prohibited for them to use online AI tools to summarize or evaluate submitted manuscripts.
Uploading a manuscript, or part of it, to third-party systems breaches manuscript's confidentiality and authorship rights. ⚒️
Uploading a manuscript, or part of it, to third-party systems breaches manuscript's confidentiality and authorship rights. ⚒️
At Tektonika #DOAJ we now have guidelines about #AI usage. We encourage our authors and reviewers to carefully read them. ⚒️ 🧪
We will explain those guidelines and comment on AI usage in our next editorial.
tektonika.online/index.php/ho...
We will explain those guidelines and comment on AI usage in our next editorial.
tektonika.online/index.php/ho...
October 24, 2025 at 11:41 AM
A very important point for our reviewers: It's strictly prohibited for them to use online AI tools to summarize or evaluate submitted manuscripts.
Uploading a manuscript, or part of it, to third-party systems breaches manuscript's confidentiality and authorship rights. ⚒️
Uploading a manuscript, or part of it, to third-party systems breaches manuscript's confidentiality and authorship rights. ⚒️
Reposted by Robin Lacassin
🌍What specific ground-motion features characterize the very shallow Le Teil earthquake (Mw 4.9, depth 1–2 km, France)?
🎯How well do ground-motion models reproduce them?
Read more: seismica.library.mcgill.ca/article/view...
🎯How well do ground-motion models reproduce them?
Read more: seismica.library.mcgill.ca/article/view...
October 23, 2025 at 11:50 PM
🌍What specific ground-motion features characterize the very shallow Le Teil earthquake (Mw 4.9, depth 1–2 km, France)?
🎯How well do ground-motion models reproduce them?
Read more: seismica.library.mcgill.ca/article/view...
🎯How well do ground-motion models reproduce them?
Read more: seismica.library.mcgill.ca/article/view...
I love this amazing view of the Mer de Glace, above #Chamonix Mont-Blanc, with this small rounded gondola dwarfed by the grandeur of the mountains.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
October 23, 2025 at 3:04 PM
I love this amazing view of the Mer de Glace, above #Chamonix Mont-Blanc, with this small rounded gondola dwarfed by the grandeur of the mountains.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
When the ice was still there and quite high, though #glaciers were already retreating.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
October 23, 2025 at 2:47 PM
When the ice was still there and quite high, though #glaciers were already retreating.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.