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Robin Lacassin

Exceptional sat. image (Terra/MODIS) of the low-pressure area (cut-off low) off coast of Portugal. It carries Saharan dust across the Mediterranean and generates a record-breaking in the west and center of France. Dusty skies covers NE Spain and SW France.

go.nasa.gov/3P5V4rS

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Robin Lacassin

Today, one of the oldest and most famous French weather observatory, Mont Aigoual at 1567m asl, smashed its 125yr old record, overpassing 30°C for the first time, with 30.3°C 🌡️ (and the day is not finished).

At lower altitude in SE France, 40°C largely overpassed everywhere. August all time records, sometimes absolute records, smashed in many places.

Strangely the voices of the climate change denialists have become silent…

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Robin Lacassin

And now it's two-thirds of France under alert, with 19 department with red flag (extreme).

Many records for the month of August have fallen, and this will continue tomorrow.

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Robin Lacassin

Red flag (max level alert) in 4 French departments because of heat wave. More than half of France under orange alert…

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Robin Lacassin

The smoke plume from in Canada travelled across the Atlantic Ocean and reached France this week-end 👇🏽 Fires in started more than 3 weeks ago in an extremely dry vegetation.

NOAA-20/VIIRS imagery

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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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