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Robin Lacassin

Monday morning, time to remember those words by Naomi Oreskes:

"It is not unreasonable to think we could […] live in a less destructive manner than we do now. If that aspiration appears to be unrealistic, then we need to find strategies to make it real."

scientificamerican.com/article

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Robin Lacassin

👋🏽 mastodon, a question.

Is it normal to have such low value, 393ppm, center of Paris at 8 am?
Is it in the range of natural daily variations?
Or is our tester having a problem?

Yesterday mean in was 424ppm, with variations of only few ppm over the day.

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Robin Lacassin

RT: I’m at . If you want to chat a little about @WeAreTektonika or other subject, I’ll be in poster room X2 at ~5:15pm today, close to @fcrameri and @drperezdiaz poster (X2.7)

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Robin Lacassin

Is the dog another reason to move from the b̶i̶r̶d̶ ̶s̶i̶t̶e̶ now Shiba Inu site ?

Will a tweet be renamed a woof or an arf ?

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Robin Lacassin

Courte video IPGP - Université Paris Cité, dans laquelle j'explique le contexte des du 6 Février en Turquie.

"3 questions à Robin Lacassin sur les séismes du 6 février 2023 en Turquie" :

youtu.be/wR1Oj-Bz_y4

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Robin Lacassin

Deux failles décrochantes du système Est Anatolien (EAF) ont rompu aujourd'hui dans le SE de la .

Le premier , de magnitude Mw7.8 à 8, a cassé plusieurs segments du “EAF main strand” sur une longueur de 150 à 300km. Le second, également de forte magnitude, Mw7.5 à 7.7, s'est produit plus au nord sur la faille de Sürgü-Çartak (EAF northern strand). En carte, les deux failles rompues, toutes deux sénestres, sont marquées par l'alignement de leurs répliques.

De très nombreuses répliques ont suivi les deux chocs principaux, mais le second puissant séisme est plutôt une rupture déclenchée sur une faille adjacente. Il ne peut pas être qualifié de réplique au sens strict.

Ces évènements, fortes répliques et séisme déclenché, nous rappellent qu'il faut rester très vigilant pendant les jours/semaines/mois qui suivent un très fort séisme.

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Robin Lacassin

Two faults of the East Anatolian Fault (EAF) system ruptured today. First, a Mw7.8 on EAF main strand probably breaking several segments. Second a Mw7.5 to 7.7 on the Sürgü-Çartak Fault (EAF N strand). Both ruptures are outlined by their aftershocks (circles on map), and both are left-lateral.

There are many aftershocks following the two big earthquakes, but the second rupture is rather a triggered earthquake on an adjacent fault belonging to the EAF system.

This reminds us to be wary of possible strong aftershocks or triggered ruptures in the following days-weeks after a big earthquake.

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Robin Lacassin

Strong destructive in SE Turkey / N Syria, magnitude Mw~7.8.

Mechanism compatible with left-lateral strike-slip on the southern part of East Anatolian Fault system. Aftershock zone extends for ~250km along that fault system. Complex source time function may suggest rupture on several fault branches. The left-lateral East Anatolian Fault system bounds the Anatolian tectonic microplate to the east.

Sources of maps:
• geoscope.ipgp.fr/index.php/en/
• emsc-csem.org/Earthquake/earth
• koeri.boun.edu.tr/new/en

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Robin Lacassin

South-central is burning. Reminds the January 2017 catastrophic that killed at least 11. Very high temperature and drought conditions (T°max 33-35°C in Santiago past days). Imagery Aqua/MODIS.

“Según el reporte de Conaf, hay 191 incendios forestales activos a nivel nacional: 45 en combate y 146 controlados, situación que va variando permanentemente por las condiciones climáticas”

Read more here (in spanish):
elmostrador.cl/noticias/multim
And:
elmostrador.cl/revista-jengibr

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Robin Lacassin

Open letter to the
to support Rose Abramoff @ultracricket
and Peter Kalmus @ClimateHuman

"We as scientists cannot and must not tolerate this censorship and chilling lack of support from our scientific society and therefore urge AGU to, etc…"

Read and sign here aguopenletter.com/

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Robin Lacassin

I asked -3 to write something about the in the .

Well written, but verbose and without much meaning. It basically repeats the prompt's ideas introducing some new details. However it's not enough to say that something is important, you have to explain why. A student giving such an answer will get a bad mark.

I'm not surprised as there is no intention, no understanding by the AI. But such a text can impress / convince a naive person on the subject, and even perhaps even some decision-makers and managers of science.

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Robin Lacassin

New post with three amazing maps of the Mont-Blanc and Geneva lake region dating back to the end of the 18th century.

tectoldies.mystrikingly.com/bl

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Robin Lacassin

Magnitude Mw~7 north of ( island, Indonesia) in a complex tectonic setting where several micro-plates interact. Quite large discrepancy btw depth estimates (16-46km), complicated source time function. Mechanism is mainly strike-slip.

Source of maps and MT solutions:
emsc-csem.org/Earthquake/earth
and
geoscope.ipgp.fr/index.php/fr/

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Robin Lacassin

This of the Mont Blanc region dates back to June 1794. The rivers and lakes are almost exact and accurate. On the other hand the mountains are quite fanciful. They are represented like linear ridges placed there to separate the valleys. And even these simplified orographic plots are quite wrong.This reveals that mountains were much less explored and mapped at that time.

Source:bibliotheque-numerique.chamber

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Robin Lacassin

I am totally astounded by what I read when I compare these two texts: Maria Graham's description of the coastal due to the 1822 , versus Charles Darwin's text on very similar phenomena related to the 1835 earthquake.

Read carefully, paying attention to the expressions used. It's like if borrowed Maria Graham's words, but also her interpretation about the accumulation of earthquakes raising the coast on the long term. 🤔
Any comment ?

Both 1822 and 1835 earthquakes happened in Central on the between Nazca and South America . Darwin's description, based on Fitz Roy (Beagle's captain) observations, is considered as seminal.

Thanks @haq for pointing me to the work by Maria Graham.

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Robin Lacassin

In my new post I follow up on the 1891 and the seminal article by Bunjiro Kotô published in 1893:

tectoldies.mystrikingly.com/bl

In this article, probably for the first time in the world, B. Kotô makes detailed descriptions of the earthquake surface rupture and offsets, and explicitly linked to faulting.

Kotô gave a beautiful 3D sketch 👇🏼 and an amazing narrative about mole-tracks (a now commonly used term for some specific surface ruptures): “Amongst the extraordinary things done by the earthquake, one that always drew attention was the earth-rent. It strikes across hills and paddy-fields alike, cutting up the soft earth into enormous clods and raising them above the surface. It resembles the pathway of a gigantic mole more than anything else.”

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Robin Lacassin

I wrote in my previous toot that I'm not a . If more skilled researchers can interpret, or use the section of our just cut down tree that was dying because of dark beetle, here are some good photos. Don't hesitate to comment.

It's from our garden very close to , just south of Paris in France. (ruler in cm)

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Robin Lacassin

As said yesterday, we had to cut down our 40 years old dying tree. It was severely attacked by bark beetle (you can see the holes on the edge of whole trunk section, and the larvae on other photos), likely after being stressed and weakened by and in the past years. A probable effect of , .

It's from our garden very close to , 60km south of Paris, France.

I'm not a so I cannot interpret in detail the trunk section. But I will post hr photos in next toot for those more skilled.

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Robin Lacassin

Task of the day: splitting wood 👇🏼

We had to cut down our 40 years old dying spruce tree 🌲. Will say more about it in forthcoming toots.

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Robin Lacassin

New paper published: A contribution to the quantification of crustal shortening and kinematics of deformation across the Western ( ∼ 20–22° S), Habel et al., Solid Earth, 2023

se.copernicus.org/articles/14/ (open access)

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