Robin Lacassin @RobinLacassin@qoto.org

I'm senior researcher at #CNRS (Centre National de la Recherche Scientifique) and #IPGP (Institut de Physique du Globe de Paris).
http://www.ipgp.fr/~lacassin

Working on #geology, #earthquake and sometimes #volcanic processes, related #hazards and risks, science communication…

I'm executive editor at TEKTONIKA https://twitter.com/WeAreTektonika (a DOA journal not yet on Mastodon), and advocate of #openscience, free #openaccess

Just moving from Twitter to Mastodon, and learning how to use it. Will keep the two accounts alive, at least for some time…

We are organizing a workshop about "The Deformation of the #Lithosphere" in memory of Paul Tapponnier. Held in Paris, France, in February 12-14, 2025, et the Académie des Sciences and IPGP.

Infos and registration (open Oct 14th) here:

https://lithodef25.sciencesconf.org/

#tectonics #geology

Maybe you have seen in the news stories about a strange #seismic
signal in Sept. 2023 that has been linked to a giant #tsunami
in a remote #fjord
in #Greenland?

Perhaps the best way to get an overview of that study is this excellent 10' video by S. Hicks and colleagues: youtu.be/60T9TKuuujs

The Eastern coast of Taiwan is prone to big #earthquakes as this map from Tang and collaborators shows. Main shallow crustal active faults are the Central Range Fault (W-dipping, earthquakes and ruptured zones in red and orange) and the Longitudinal Valley Fault (E-dipping, in blue) 5/n
From: https://doi.org/10.1038/s43247-023-00994-0

Two magnitude 6+ event happened in 2018 and 2019 in the very same region than the 3 Februaryb 2024 Mw7.4. The 2018 Mw6.4 #earthquake had a complex (strike-slip + reverse, several fault segments) shallow crustal rupture.
3/n

See: https://doi.org/10.1016/j.epsl.2019.115729 and https://doi.org/10.1785/0220180228

This E-W section at Hualien latitude only shows a 2D view of the complex 3D structure. If the ~20-40km hypocentral depth of the Mw7.4 #earthquake is true*, it's difficult to figure out which fault ruptured. Could be one not reaching upper crustal levels. Just hypotheses.
2/n

Section from Lallemand 2014, https://doi.org/10.1016/j.jseaes.2013.07.043

* Saying "If the ~20-40km depth of the rupture is true" is a big IF as the Taiwan seismic center puts epicenter of the main shock at 15km only. Needs further studies.

Source region of #Taiwan Mw7.4 #earthquake of 6 Feb. has a complicated 3D lithospheric structure: interaction between the Ryuku subduction and accretionary wedge, the accreted Luzon arc (now forming the coastal range), the Philippines plate, and the Taiwan orogenic prism (central range and foothills).
1/n

And this: "China’s addiction to building new coal-fired power plants is becoming increasingly entrenched…" in The Guardian

#COP28

https://www.theguardian.com/world/2023/nov/27/china-coal-addiction-spotlight-climate-ambitions-cop28

Also this: "The United States is poised to extract more oil and gas than ever before in 2023, a year that is certain to be the hottest ever recorded, providing a daunting backdrop to crucial United Nations climate talks" in The Guardian

#COP28

https://www.theguardian.com/environment/2023/nov/27/us-oil-gas-record-fossil-fuels-cop28-united-nations

#COP28
BBC writes: The United Arab Emirates planned to use its role as the host of UN #climate talks as an opportunity to strike oil and gas deals. 😒

https://www.bbc.com/news/science-environment-67508331

#ClimateCrisis #ClimateEmergency #dontlookup

I love this week's cover of #Science, with the famous north faces of the Tre Cime di Lavaredo ⛰️ in the Italian #Dolomites.

Related perspective article about "the dolomite problem": https://www.science.org/doi/10.1126/science.adl1734

On BBC, Macron calls for cease fire in #Gaza. He calls on Israel to stop killing Gaza's civilians, women and babies. Listen to excerpts of BBC interview (linked).

That's strong and valuable words, but the problem is that Macron doesn't have the same words in French and on French media…

https://youtu.be/2xvP4CWT0VA?feature=shared

The dataset https://doi.org/10.18715/IPGP.2023.ldbm60lm, linked to the article "Upper-plate Shortening and Mountain-building in the Context of Mantle-driven Oceanic Subduction", includes videos and photographs depicting the evolution in top and lateral views of the 5 analogue experiments.

3/3

This animated GIF 👇🏽 summarizes the main results and figures of Habel et al's article "Upper-plate Shortening and Mountain-building in the Context of Mantle-driven Oceanic Subduction 🏔️

Article: https://tektonika.online/index.php/home/article/view/39

Keynote GIF: https://drive.google.com/file/d/1oT6hzKwTtvWS8JX7anyYc0s-P1odQU-o/view?usp=sharing

2/3

In our new paper, Habel et al. 2023, we use analogue models to discuss the effect of mantle flow on upper-plate shortening, and #mountain building in Andean #subduction margin context. The paradigmatic #orogen type being the #Andes #Altiplano in front of the Nazca-South America plate boundary.

https://tektonika.online/index.php/home/article/view/39

Proud and happy that it is published in TEKTONIKA DOAJ (@wearetektonika )

1/3

Storm 🌀 Ciarán approaching Brittany at nightfall 👇. Three departments in western France are on red alert, large part of the country in orange. Extreme winds 💨 forecasted.

Be cautious, stay safe ❤️ !

Reminder: the seminal article about the source of the 464BC #earthquake is this one:

Armijo et al. "A possible normal-fault rupture for the 464BC Sparta earthquake", Nature, 1991, https://doi.org/10.1038/351137a0