João C. Duarte
@JoaoCDuarte
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Assistant Professor in Tectonics ULisboa | Editorial Board Member @CommsEarth Elected President of the Tectonics and Structural Geology Division at EGU
Lisboa, Portugal
Joined June 2013
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The printed version of the book is again available for orders. Here's the code for a 30% discount.
Code: ATR30
|
#tectonics
#geology
#geodynamics
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Still one of my favourite photos. The tide was coming. I had to stay back with some students. When I arrived at the outcrop, I just had time to take a quick photo with my mobile. Triassic sandstones over Carboniferous greywackes. Location: Sagres, Portugal
#Geology
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Drop a cool photo someone took of you doing your job. Teaching in my favorite classroom. Pangaea forms, Pangaea breaks up.
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It is difficult to capture how big this thing is, but this one helps!
Upper Carboniferous – Upper Triassic Unconformity, Sagres, Portugal.
#Geology
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Our book is now available online. This was probably the biggest endeavour of my professional life and also the most rewarding. I must thank all the authors for their hard work and for accepting to be part of this project. I deeply admire you all.
@FC_UL
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My favourite outcrop! This one was taken by my dear colleague
@LisbonStructGeo
. Carboniferous–Triassic Unconformity. Sagres, Portugal.
#geology
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Telheiro angular unconformity between upper Carboniferous metasedimentary rocks (flysch turbidites) and Upper Triassic red sandstones (Sagres, Portugal).
#geology
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(1) I have put here some more movies of our models of the Western Mediterranean, which help to visualize what is going on. Feel free to use them for any purpose. I often used them for teaching and it helps students understand the dynamics of rolling back subduction zones.
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Some of our models predict a bit of a dramatic future....
🫣🫢
…
#geology
@geosociety
@IdlLuiz
@cienciasulisboa
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Sorry that this one goes in Portuguese. Maybe a reason to learn it :)
Comecei um novo blog em Português de divulgação em geociências. O público alvo são os professores e alunos do ensino pré-universitário e público em geral. Here's the link
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Why are the Himalayas still growing?
We have shown using simple physical models that the slab-pull at the Sumatra subduction zone pulls the Indo-Australian plate to the north, forcing India to collide with Eurasia. Without it, the collision should have stopped long ago.
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On the 1st of November 1755, a giant 8.5 earthquake destroyed the city of Lisbon. Today we still do not know what caused it and from which tectonic fault it came. Although we have ideas, there's still a lot to do. Earthquakes are cyclical and will happen again.
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1/6. I have a story. I submitted this book proposal for the first time to a publisher associated with a renowned university. They reviewed the proposal and accepted it. However, they said that the book had to pass by a board of the university (unknown to me).
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Excellent paper by Robert Stern, Taras Gerya and Paul Tackley opening the doors for a new tectonic world. Plate tectonics is only one of many modes in which planets can operate. These modes also represent different evolutionary steps.
#geology
#tectonics
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I also like this one. The light was challenging.
Telheiro angular unconformity between upper Carboniferous metasedimentary rocks (flysch turbidites) and Upper Triassic red sandstones (Sagres, Portugal).
#geology
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New post on the interior structure of the mantle (may need to activate translation from Portuguese in your browser):
Source of images:
- Tomography visualiser:
http://136.144.177.195/
- Torsvik et al. (2016):
#geology
#geologia
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Our visiting PhD student from Oviedo, Brais Gonzalo, has been doing some funky experiments!
#geologia
#geology
#tect
ónica
#Tectonics
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Experiment fully done by our 3rd year project students. They got some really cool structures!
#Geology
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This map by Stern et al. (2016) shows why the 1755 earthquake should never have happened. In the last ~350 years, it was the only major quake to happen far from a major subduction zone. This suggests there is something weird going on here.
#earthquakes
#geology
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Subduction zones are difficult to start in Atlantic-type oceans. Our paper explores the alternative mechanisms of invasion, in which a subduction zone migrates from a dying ocean to a new growing ocean. Here's the main figure of the paper.
#geology
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I am happy to announce that have taken the role of Deputy President of the Tectonics and Strutural Geology Division
@EuroGeosciences
. Looking forward to it and delighted to embark in this new adventure
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In Chapter 14, Wouter Schellart reviews what we know about subduction zones' dynamics.
#Geology
#tectonics
#subduction
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This picture almost captures the brutal scale of the place. Look at the people in the base of the cliff...
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I am running for President of the Tectonics and Structural Geology Division of the European Geosciences Union (EGU). I am the only candidate, but I would really like to have your vote. If you are a member, you shall receive a voting link soon.
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And what would happen if a slab meets a plume in the middle of the mantle? Side view and top view below.
#Monash
#Geodynamics
#slabs
#plumes
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MANTLE PLUMES
The topic of today's blog publication is mantle plumes:
Source of figures figures:
- Made using the tomography visualiser:
http://136.144.177.195/
- Torsvik et al. (2016):
#geologia
#geology
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It's with great pleasure that I share with you that I was elected President of Tectonics and Strutural Geology Division of the European Geosciences Union for 2025-2027
@EuroGeosciences
@EGU_TS
. I will give my absolute best to serve the community.
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Today's M7.8 earthquake in Turkey occurred near the intersection of the East Anatolian Fault zone and the Dead Sea Fault system. This is a complex region where several tectonic plates interact.
Figures from Haddad et al. (2020) and Kyle Bradley.
#earthquaketurkey
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Happy that our work promoted some nice discussion on how subduction zones propagate into Atlantic-type oceans!
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The M4.5 earthquake that occurred yesterday south of Faro was located in an area where a number of important faults were mapped: the NE-SW Cádiz fault and the E-W Banco de Portimão south fault.
#earthquakes
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The other book has a cover! The fantastic model output was produced by Nicolas Coltice. We are still dealing with the proofs but should be out within a few weeks. Here it is:
Huge thanks to all the authors!
@FC_UL
@IdlLuiz
#tectonics
#Geology
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This is a good map to visualize the three Atlantic subduction zones: Scotia, Lesser Antilles and Gibraltar. Source:
#subductioninvasion
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I don't want to spam you too much, but this article is nicely written and deserves to be shared:
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On this day, in 1969, occurred one of the biggest earthquakes ever to hit the Atlantic. It had a magnitude 7,9 and the epicentre was located about 200 km SW of Portugal. We shall not forget.
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New post on the Earth sciences paradigm shift that was the theory of plate tectonics. There are moving plates, not only drifting continents.
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Today I gave my first talk as Fellow of the Lisbon Academy of Sciences and received my diploma. It is an honor to be part of an institution whose mission is to seek and share knowledge.
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This is very important!
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The cover of the book was ready one year ago! We still have a 30% discount. Just have to apply this code (ATR30) here:
Happy Birthday!
#geology
#tectonics
#earth
#geophysics
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In Chapter 13, Robert Stern and Taras Gerya introduce the field of biogeodynamics and explore how different tectonic styles influence life.
#geology
#tectonics
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Sometimes when I invite colleagues to write book chapters, they say: "nobody reads book chapters anymore" or "why would I invest time in writing a chapter?. Well, this chapter we wrote in 2016 just reached 100,000 reads on ResearchGate ;) It seems people still read chapters... ;)
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In Chapter 10, Masaki Yoshida discusses what drives the Earth's supercontinent cycle.
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This is the last obstacle to get in Telheiro. A bit of a narrow passage.
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Field teaching in Algarve is always very hard!
With Associação Portuguesa de Geólogos
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"The Atlantic Ocean won't last forever. When it starts to close, it will be subduction zones that consume oceanic crust. New research suggest one is propagating into the Atlantic today."
#geology
@IdlLuiz
@cienciasulisboa
@geosociety
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New blog publication. This is the start of a new series on plate tectonics. Sorry is in Portuguese, but these texts are directed at school teachers and students in Portugal. If you'd like to read them, copy and paste the text into some AI.
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Here's a nice chapter for context from a book we have edited a couple of years ago: "Strike-Slip Fault Systems Along the Northern Caribbean Plate Boundary", by Richard J.F. Wessels.
#Haitiearthquake2021
#Earthquakes
#Haiti
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Subduction experiment
#Monash
. Gravity and the density contrast between materials are the only driving forces, resisted by their viscosities. No push from the boundaries. Useful to understand how subduction works.
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Our fantastic fantastic students (David Barata, Madalena Correia, Miguel João e Telma Godinho) have done a great job! Well done!
#geology
#experimentaltectonics
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In case you are interested, the Preprint of our recent paper on the invasion of the Gibraltar subduction zone has been published here:
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In 2010, a hazard map estimated that the maximum magnitude off Sendai was 7.7 in the next 30 yrs. An earthquake with intensity IX would only happen every 30,000 yrs. In 2011, an M 9.1 earthquake and intensity IX took place in that location. What do we learn from this?
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Ontem, pelas 22:11 (UTC), ocorreu em Marrocos um sismo de magnitude de 6.9, a 550 quilómetros da fronteira entre as placas africana e euroasiática, num falha inversa com direção aproximada Este-Oeste. O sismo teve uma intensidade máxima de VIII, causando o colapso de edifícios.
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A zona do sismo de hoje é uma "red zone". É com estes mapas que temos de trabalhar quando nos perguntam se "conseguimos prever sismos?". Já conseguimos calcular quais são as zonas onde há maior probabilidade de ocorrer sismos e de estes causarem estragos.
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Today we filmed a documentary about planet Earth with an excellent team from the portuguese national TV broadcaster RTP.
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Fresh one! Nice to see it out. It matured over many years and it was an incredible teamwork.
#geology
#tectonics
#Caribbean
#subduction
#subductioninitiation
@FC_UL
@IdlLuiz
@ULisboa_
@uni_mainz
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Please came and see a physical copy of the book at the
@ElsevierConnect
booth at
#EGU23
, Exhibition Hall in the first floor. They also have discount vouchers if you want to order a physical copy.
@EuroGeosciences
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New post on Continental Drift. An important point is that mantle convection was proposed by Holmes in 1931 to explain continental drift, not plate tectonics. At this point, the concept of "plate" did not exist yet.
Image: Snider-Pellegrini 1958
#geology
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I just got an important project rejected. One of the main arguments to put down my CV was that I invest too much time communicating science. Dear panel members, let me be very clear: I communicate science not because it is my job but because it is my passion!
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A cool realisation. We have now modelled the formation of the three Atlantic subduction zones. Something I could only dream a few years back. Many thanks to all the co-authors for making it possible. It was a long way, but it was a lot of fun 😎
#subductioninvasion
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Cool video of some experiments we did a few years back
@MonashEAE
. A rising plume interacts with a sinking slab. Because of the strong negative buoyancy of the slab, the plume is dragged by the slab-induced mantle flow.
#geology
#geodynamics
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BBC Future just wrote a nice story about some of our recent works. With
@green_mattias
@HSophiaDavies
@IdlLuiz
@FC_UL
@sos_bangor_uni
@BangorUni
@NASAGoddard
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New beautiful analogue model by our Project students
@FC_UL
. This time a releasing bend.
#geology
#tectonics
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Today my dear professor João Cabral gave me this book! I am so happy 🤗🌍🌋 This is a treasure!
#Tectonics
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Restraining bend sandbox experiment
@IdlLuiz
@FC_UL
@GeoFCUL
with an amazing group of students. With
@LisbonStructGeo
#geology
#tectonics
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They arrived! Got me some nice books. There is still so much to learn and to pass to the new generation...
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