Robin Lacassin @RobinLacassin@qoto.org

After shelling of energetic infrastructures by Russia #Ukraine appears so dark on the nighttime satellite images. It looks like a desert area, but it is not.

People there are struggling with winter temperatures and war news.

Imagery from: https://worldview.earthdata.nasa.gov/?v=-15.138500618814131,28.210403664185364,58.70256690613667,68.56720823870361&l=Reference_Labels_15m(hidden),Reference_Features_15m,Coastlines_15m,VIIRS_SNPP_DayNightBand_At_Sensor_Radiance,VIIRS_SNPP_DayNightBand_AtSensor_M15(hidden),VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden)&lg=true&t=2022-11-23-T22%3A52%3A20Z

I just learned that I'm working on material science 👇🏼
Our mailboxes are full of such toxic messages - waste of energy. Here a predatory company located in the USA (NJ). How to regulate this ?

Just received the big #climate book coordinated by Greta Thunberg @gretathunberg
Hours of interesting but frightening reading to come. Thanks in advance to all the authors.

In 1999 the North Anatolian Fault (NAF), Turkey, broke during two destructive #earthquakes east of Istanbul (Mw7.4 Izmit and Mw7.2 Düzce earthquakes respectively on 17 Aug and 12 Nov).

Today's Mw6.1 #earthquake happened just east of Düzce with a faulting mechanism very similar to the 12 Nov 1999 event (strike-slip with small normal component). Its epicenter is located little to the north of the main NAF fault trace.

Map with MT and source function from #IPGP #Geoscope http://geoscope.ipgp.fr/index.php/fr/catalogue/description-d-un-seisme?seis=us7000irp8

Other map shows in red the fault broken by the two 1999 events (purple and red stars locate epicenters, yellow circles show aftershocks). From C ̧akir et al. GJI 2003 https://doi.org/10.1046/j.1365-246X.2003.02001.x.

Oh. I forgot to give the answer about the mysterious cartographic exercises from the previous post of this thread. Sorry.
Here they are 👇🏼

In a recent Science paper, Proud et al. estimated that the Hunga Tonga-Hunga Ha’apai volcanic plume reached an altitude of 57km "well past the stratosphere and into the mesosphere and higher than any volcanic plume previously recorded".

They used geostationary weather satellite imagery. The different satellites recorded the #volcano eruption with multiple viewing geometries. This allowed the researchers to compute plume altitude based on the parallax effect.

https://www.science.org/doi/10.1126/science.abo4076

New Zealand's National Institute for Water and Atmospheric Research (NIWA) press release about January Hunga-Tonga #volcano eruption. https://niwa.co.nz/news/tonga-eruption-confirmed-as-largest-ever-recorded

"Hunga-Tonga Hunga-Ha'apai (HT-HH) emitted the biggest atmospheric explosion recorded on Earth in more than 100 years (…) almost 10km3 of seafloor was displaced (…) the caldera, or crater, is now 700m deeper than before the eruption."

"NIWA scientists have also unravelled one of the biggest unknowns of the eruption – the pyroclastic flows (…) Samples showed [underwater] pyroclastic deposits [at least] 80km away from the volcano."

Magnitude Mw 7 #earthquake offshore #Guadalcanal island in #Solomon archipelagos. Small #tsunami waves in Honiara on other side of the island.

There, at the San Christobal trench, the Australian plate is subducting beneath the Solomon arc.

Moment tensor solution ("beach ball" on the map) implies rupture either on a vertical fault or a nearly horizontal one. More data and models will be needed to understand if the earthquake happened on the subduction megathrust or within the downgoing plate.

MT and source function from http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000irfb
Sea level graph from https://webcritech.jrc.ec.europa.eu/SeaLevelsDb/Device/1695

I finally succeeded to get the green "verified" mark 😆

First I started pasting the html instruction not into the head and in the wrong file. Nothing happened. When I put it at the root of my personal IPGP page (in index.html) it suddenly worked 🤓

Today's #earthquake in W Java has a strike-slip mechanism according to moment tensor solution by BMKG, Indonesian Meteorology, Climatology, and Geophysical Agency - https://inatews.bmkg.go.id/

See map 👇🏼 with the "beach ball" showing the fault mechanism with two possible very steep fault planes.

Hypocenter shallow depth ~11km and closeness to Cianjur town (less than 10km), where damages are reported, likely explains its destructive character. Strong shaking also reported in Jakarta at ~80km from the epicenter.

According to posts on twitter, there are significant damages and at least 2 fatalities after a moderate magnitude M5.6 #earthquake in western Java island, Indonesia. Inland shallow fault rupture, close to towns, likely explain the destructions.

RT 👇🏼 https://twitter.com/BNPB_Indonesia/status/1594596756205244418?s=20&t=N0QFeOPMmCQp1ReAfiCnjw
and
https://twitter.com/pamumpuni/status/1594599955037028354?s=20&t=N0QFeOPMmCQp1ReAfiCnjw

The Ka or Ca family of Diamond Open Access Journals DOAJ launched by the community:
• Volcanica (are they on the fediverse?)
• Tektonika (soon on the fediverse)
• Seismica @weareseismica
• Sedimentologika just open !
• and soon Geomorphica

#DOAJ #openaccess #openscience #publishANDnotperish

A magnitude Mw6.9 #earthquake offshore south-central #Sumatra.

Mechanism and location suggest rupture on the shallow part of the #subduction #megathrust close to the trench (on the very shallow dipping fault plane). However, modelled depth of ~19km, if true, seems little too deep given the closeness with the trench (USGS gives same depth and mechanism). This means that we cannot exclude a rupture on the steep fault plane within the oceanic plate.

Map with source time function from Geoscope IPGP
http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000iqpn
Larger map with epicenter of this event in red from USGS (both not yet on fediverse it seems)

Three other mysterious sketches. Now you know these are geographic maps to be completed. What are they showing ? 3/4
Answer tomorrow 😉

The cover of this #cartography exercise book, published in 1966. 2/4

Yesterday I posted the sketch to the right asking "what is this?" Now you have the answer 👇🏼

It's from a 56 years old French book of #cartography exercises, to learn #geography at primary school. Now an amazing #sciart. 1/4

What does this 👇 show?
Any idea ?
Hint: geography related

Answer to come…

#sciart

Being editor of Tektonika (https://tektonika.online) I'm so happy to see that our friends from Seismica @weareseismica have just published their editorial paper "The launch of Seismica: a seismic shift in publishing" 👏

Christie Rowe (@keepitrheol) et al. https://seismica.library.mcgill.ca/article/view/255

Well, the twittosphere and matodosphere marvel at the launch of #Artemis #lunar rocket by #NASA…

That's fine. But is it really a priority for humanity in the face of much greater and more vital challenges like #climate and #biodiversity crises and the urgent need to mitigate and adapt ? I doubt.

Don't hesitate to comment.

Temperature stripes for France 👇 (even without 2022 that will likely tackle records). From: https://showyourstripes.info

#climatecrisis

Few months ago, together with @RaphaelGrandin and J.M. Lalande from MeteoFrance, I participated as a scientific advisor to the making of this amazing scientific illustration 👇 #scicom #sciart

It summarizes scientific observations on the Hunga #Tonga #volcano explosion, associated global #tsunami and atmospheric waves.

French newspaper Le Monde published these 2 pages in September 2022. Great work by the journalist and the graphic designer, Vahé Ter Minassian and Audrey Lagadec.

DM if you would like a higher resolution PDF 😉