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Jacek Szczygieł @speleojacek.bsky.social · 02/10/2026

Rupicapra rupicapra tatrica (goat) eating Oreojuncus trifidus (sit skucina in 🇵🇱) plant that become red end of august, hence Czerwone Wierchy (Red Peaks massife) #Tatry

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Jacek Szczygieł @speleojacek.bsky.social · 29/09/2026

Of course the grain is from the cave😁

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Jacek Szczygieł @speleojacek.bsky.social · 29/09/2026

From a grain of sand to the history of glaciations. Proud to see our paper featured on the cover of Geology! Even prouder of my PhD student, Dawid Siemek, whose work helped uncover a new chapter in the glacial history of the Carpathians. read here doi.org/10.1130/G548... @geosociety.bsky.social

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Jacek Szczygieł @speleojacek.bsky.social · 21/09/2026

Mission accomplished: cave deformation found, measured, and sampled on Amorgos (maybe some connected to 1956 EQ) and Ikaria (next to Samos) 9-day trip; 2 islands; 7 days of caving (1-5 caves/day); 20 caves (9-131 m of depth); 33 samples; two (efficient) friends

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Jacek Szczygieł @speleojacek.bsky.social · 16/09/2026

Exactly! But that is the beauty of caves, no other way to know than to walk through, descend another pit, pass another corner, etc. No shortcuts, no satellite photo, no remote sensing, must be there to explore and see

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Jacek Szczygieł @speleojacek.bsky.social · 16/09/2026

Like in a thriller, I found the best site with fallen, crushed stalactites and colums, sealed bedrock #fractures, a few hours before leaving Amorgos…so good I ran out of sampling bags. Did I find the 1956 #earthquake in the geological record? Maybe an older events? Dating will show

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Jacek Szczygieł @speleojacek.bsky.social · 14/09/2026

sample or not to sample? ... sample! another 2 days on Amorgos, 9 caves, two more to go. So far, no "smoking gun," a few compressed columns, some broken stalactites, and, unfortunately, very few active speleothems. But if it were that easy, someone would have done it already... ehh research💁‍♂️

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Jacek Szczygieł @speleojacek.bsky.social · 12/09/2026

First day of fieldwork in the #Amorgos 🇬🇷 #caves, looking not only for damage from the 1956 #earthquake but especially for older structures, to hopefully catch other events that are so far lacking in the records. First cave revealed some very tiny #deformation. Stay tuned @ncn.gov.pl

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Jacek Szczygieł @speleojacek.bsky.social · 23/07/2026

~80% of the present-day relief (+700 m) had already developed by ~1.6 Ma ago, before the onset of the 100kyr glacial cycles Our data suggest that river incision—not glacial erosion—was the primary driver of relief formation in the Tatra despite their spectacular glacial landforms

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Jacek Szczygieł @speleojacek.bsky.social · 23/07/2026

Instead of studying the surface, we looked underground. Using 32 paired cosmogenic Al/Be burial ages from cave deposits we reconstructed when underground river passages formed as valleys deepened. This provides one of the longest direct records of valley incision in a glaciated mountains

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Jacek Szczygieł @speleojacek.bsky.social · 23/07/2026

🏔️ Did glaciers really build the Tatra landscape? Our new paper in EPSL uses #cave sediments to reconstruct >5 million years of #landscape evolution, and the results challenge the traditional view of how #mountain valleys formed doi.org/10.1016/j.ep... #CosmoNuclides @ncn.gov.pl

doi.org

Redirecting

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Jacek Szczygieł @speleojacek.bsky.social · 10/07/2026

Why are steep limestone slopes so stable over 0.5 Ma? Now available #OpenAccess doi.org/10.1016/j.en... We structurally analyzed and dataed Alpine cave passage dislocations and used limit equilibrium analysis and #FEM elastic stress modeling to figure this out Thanks to @ncn.gov.pl

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Jacek Szczygieł @speleojacek.bsky.social · 09/07/2026

Quartz grains preserved in the #cave of the Western Carpathians reveal the first direct evidence of Mid-Pleistocene #glaciation in the region. Super proud of my PhD Student Dawid Siemek who just published research in #Geology @geosociety.bsky.social #OpenAccess doi.org/10.1130/G548...

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Jacek Szczygieł @speleojacek.bsky.social · 01/07/2026

Fresh off the press in Engineering #Geology: Long-term stability of steep deglaciated #slopes of Alpine karst plateaus #cave #speleothem dating; Limit equilibrium analyses; #FEM elastic stress #modelling; Deep-seated gravitational #deformations sciencedirect.com/science/arti... funds@ncn.gov.pl

sciencedirect.com

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Jacek Szczygieł @speleojacek.bsky.social · 17/06/2026

I am not familiar with the Ruhr geological setting, but it is not that much different from Silesia.

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Jacek Szczygieł @speleojacek.bsky.social · 17/06/2026

Interesting point, in western PL in copper mines within thick dolomites, magnitudes are even higher than in Silesia - the more rigid the rock, the more stress it accumulates: makes sense for thick-layer dolomite vs sandstone intercalated with mudstone and coal.

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Jacek Szczygieł @speleojacek.bsky.social · 17/06/2026

Most of it is induced by mining destabilization, focused within the mine, but some, especially those with hypocenters below mines, could be caused by remnant tectonic stress, but triggered by mining Here is an example, we studied those M3+👇 www.sciencedirect.com/science/arti...

sciencedirect.com

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Jacek Szczygieł @speleojacek.bsky.social · 16/06/2026

No, Christoph, we did not produce an earthquake in our lab… Just an induced seismicity in the coal mining area

static.klipy.com

Dr. Doofenshmirtz's Evil Welding Plan

ALT: Dr. Doofenshmirtz's Evil Welding Plan

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Jacek Szczygieł @speleojacek.bsky.social · 15/06/2026

Despite the effort, we did not find enough #deformation in the caves around the Corinth #Rift (Greece) In fact, the poor available #cave documentation led to a lot of unnecessary driving and even more wandering through thorny bushes GOOD MAPS MATTER! @chrispennock.bsky.social @ncn.gov.pl

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Jacek Szczygieł @speleojacek.bsky.social · 12/06/2026

…and we finish the day with visiting “classic” site of Kaparelli #fault ruptured in 1981 and it's paleoseicmicyty was studied (36^Cl dating) by Lucia Benedetti et al (2003) GREECE Paleoseismology doi.org/10.1046/j.13...

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Jacek Szczygieł @speleojacek.bsky.social · 12/06/2026

On the way to the caves, we visited Pisia #fault scarp studied in Mechernich et al. 2018, and the impressive knickpoint a few hundred meters from the sampling site doi.org/10.1029/2017... @paleoseismicity.bsky.social

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Jacek Szczygieł @speleojacek.bsky.social · 20/05/2026

Samara Canyon on #Crete - wet dream of geomorphologist with background in structural geology

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Jacek Szczygieł @speleojacek.bsky.social · 16/05/2026

@watershedlab.bsky.social, reach out once you know your trip schedule, and I can try to advise about the Geosites to visit, or if we would be on-site (not in the field), we can organize a tour in our Institute museum

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Jacek Szczygieł @speleojacek.bsky.social · 02/05/2026

Absolutely mind-blowing visit in Białowieża primeval forest🤯 The photos do not reflect the diversity… just stunning. PRESERVE this ecosystem, unique for the European scale (if not global)

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Jacek Szczygieł @speleojacek.bsky.social · 28/04/2026

#Earthday in the Silesian Planetarium (last Saturday) I told, among others, about eigenfrequency, i.e. why during mining tremors they nod chandeliers and not buildings, and how I translate it into earthquake research in caves #SciComm

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Reposted by Jacek Szczygieł

paleoseismicity.org @paleoseismicity.bsky.social · 12/03/2026

Postdoc position on speleothem seismic vulnerability from FEM modeling (1-2 years) in Katowice (Poland) w/ @speleojacek.bsky.social paleoseismicity.org/postdoc-posi...

paleoseismicity.org

» Postdoc position on speleothem seismic vulnerability from FEM modeling (1-2 years) in Katowice (Poland)

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Jacek Szczygieł @speleojacek.bsky.social · 18/02/2026

The real #UpsideDown is in the #cave where the channel incises into the ceiling, eroding upwards Polish #Jura

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Jacek Szczygieł @speleojacek.bsky.social · 11/02/2026

Is it C major, C minor, or rather 36Cl? Another day of sampling the #fault #scrap in eastern Crete 🇬🇷 @ncn.gov.pl project #fieldwork

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Jacek Szczygieł @speleojacek.bsky.social · 27/01/2026

📢Hot off press: Pitfalls of multiplied 3D landforms projection Why #mapping still matters in the #LiDAR-dominated times? We published some thoughts, tips and tricks on #cave mapping using the example of >10 km long, >1km deep Gamssteig Cave System in the Göll Massif #Alps doi.org/10.5038/1827...

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Jacek Szczygieł @speleojacek.bsky.social · 11/01/2026

Exploring a #cave by #climbing is the top tier of initiation. Clip from one of the three chimneys we climbed recently in one of the Tatra Mountains caves. From dozens and hundreds of days underground, days like this are remembered forever

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Jacek Szczygieł @speleojacek.bsky.social · 23/12/2025

Our paper, discussing the curious case of a short #fault scarp in the Podhale Basin and its Implications for the #Quaternary geodynamics of the Western #Carpathians, is now out. Link with 50 days of access authors.elsevier.com/a/1mJha,3sl42u… @paleoseismicity.bsky.social

authors.elsevier.com

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Jacek Szczygieł @speleojacek.bsky.social · 13/12/2025

Hot off the press📢 Some fault doesn't want to behave properly Read our story about the curious case of a short fault scarp in the Podhale Basin, Carpathians🇵🇱 That was quite a challenge for us: first to interpret it and later publish… www.sciencedirect.com:5037/science/arti...

sciencedirect.com

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Jacek Szczygieł @speleojacek.bsky.social · 28/11/2025

#FridayFault Strike-slip fault plane outcropping in the Melissotrypa cave in Thessaly 🇬🇷 look at the size of perfectly preserved structures @christospennos.bsky.social for scale @ncn.gov.pl SonataBIS fieldwork

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Jacek Szczygieł @speleojacek.bsky.social · 23/10/2025

Last week, I had the pleasure of organizing in the #Tatra Mts. 59 Polish speleological symposium. Inspiring invited lectures, great talks, and most importantly, discussions in the field where we shared the last decade of our research😁I am happy we could award 4 #ECR grants

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Jacek Szczygieł @speleojacek.bsky.social · 07/10/2025

There are still a few weeks left to apply for the postdoc position in my @NCN_PL project.👇 You can model using #FEM OR you're interested in #seismology OR structural resistance to #seismic waves? Help me test some controversial hypotheses! Let's break some rocks and calculate how they break :)

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Jacek Szczygieł @speleojacek.bsky.social · 28/09/2025

Not only do speleothems make caves enjoyable! Textbook hypogene morphology in Brzozowa #cave in the Polish Jura upland: cupolas, feeders, ghostrock.

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Jacek Szczygieł @speleojacek.bsky.social · 05/09/2025

📢Fresh off the press Unexpected latest Pleistocene W-dipping reverse fault-slip in the Maritimes Alps (SE France)—Insights from passage offset in Mescla Cave Now available in J. Of Quaternary Science onlinelibrary.wiley.com/doi/10.1002/... All started from discussion on PATAdays22 @paleoseismology

onlinelibrary.wiley.com

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Jacek Szczygieł @speleojacek.bsky.social · 05/09/2025

#climbing … because even the most passionate caver needs a sun ☀️ from time to time😉 Byczkowski route on the western face of Kościelec, #Tatra

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Jacek Szczygieł @speleojacek.bsky.social · 03/09/2025

Discovering unknown… love it August in the Northern Calcarouse Alps, the Göll massif. Oh, btw, the new #cave passages are on the N-S #fault which I described here: doi.org/10.2113/2024...

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Jacek Szczygieł @speleojacek.bsky.social · 31/07/2025

Here is the 50-day free access link authors.elsevier.com/c/1lUJp8RViAsze In contrast to previouse research, we show that even small #glaciers (2km long) can produce #microtextures on quartz #grains; hence, even small glaciers can be “caught” in depositional record via #SEM and reconstructed.

authors.elsevier.com

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Reposted by Jacek Szczygieł

Jason "Jay" R. Patton @earthjay.bsky.social · 30/07/2025

#EarthquakeReport for M8.8 #Earthquake offshore of #Kamchatka #Russia been busy responding and still doing that aftershock pattern matches 1952 M9 rupture patch '24 and 20 July '25 foreshocks see report to learn more about 1952: earthjay.com?p=12053 earthquake.usgs.gov/earthquakes/...

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Reposted by Jacek Szczygieł

Dr. Judith Hubbard @judithgeology.bsky.social · 30/07/2025

⚒️ 🧪 A M8.8 earthquake just ruptured the subduction zone offshore Russia’s Kamchatka peninsula. This is one of the world’s truly huge earthquakes, and a triggered tsunami is currently traveling across the Pacific ocean. This same fault ruptured on July 20th in a M7.4, and last August in a M7.1.

earthquakeinsights.substack.com

M8.8 earthquake strikes offshore Kamchatka

A dangerous subduction megathrust ruptures once again

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