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Jamie Farquharson

@farquharson.bsky.social
483 followers 371 following 84 posts

Volcanologist • Archipelagan • Reads a lot • Tries hard • Professor @ Niigata University

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Jamie Farquharson @farquharson.bsky.social · 15/10/2025
🫣
A graph of four consecutive marathon times between 2022 and 2025. After plunging between 2022 and 2023, the times have gotten progressively longer...

There is no y axis.
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Jamie Farquharson @farquharson.bsky.social · 30/09/2025
Perhaps unsurprisingly, the Hunga Tonga-Hunga Ha`apai eruption stands out as the dominant event across almost all languages. People were talking about it all over the planet!
A graph of vertically overlapping timeseries, with a prominent spike labelled as “HTHH.” (Hunga Tonga Hunga Ha'apai) The individual timeseries traces are labelled from top-to-bottom: 
volcanic eruption; 
erupción volcánica;  
éruption volcanique;  
letusan gunung berapi;  
vulkanausbruch;  
erupção vulcânica;  
извержение вулкана;  
volkanik patlama;  
火山爆发;
vulkaanuitbarsting;  
eldgos;  
eruzione vulcanica;  
ภูเขาไฟระเบิด;  
ثوران†بركاني
산 분출;  
火山噴火;
erupsi vulkanik;  
የእሳተ ገሞራ ፍንዳታ.
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Jamie Farquharson @farquharson.bsky.social · 30/09/2025
Using a short-term/long-term averaging approach, we can define an “anomaly score” α. Basically, spikes in α signify that Twitter activity is heightened above its background level. These event spikes tend to correspond to real-world events, which is cool.
A graph of vertically overlapping timeseries, with a prominent spike labelled as “Fagradalsfjall.” The individual timeseries traces are labelled from top-to-bottom: 
volcanic eruption; 
erupción volcánica;  
éruption volcanique;  
letusan gunung berapi;  
vulkanausbruch;  
erupção vulcânica;  
извержение вулкана;  
volkanik patlama;  
火山爆发;
vulkaanuitbarsting;  
eldgos;  
eruzione vulcanica;  
ภูเขาไฟระเบิด;  
ثوران†بركاني
산 분출;  
火山噴火;
erupsi vulkanik;  
የእሳተ ገሞራ ፍንዳታ.
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Jamie Farquharson @farquharson.bsky.social · 29/07/2025
Are you a volcanologist or working in an adjacent field? Consider signing up for Niigata University’s 1st international symposium on “Volcanology in Practice”: www.thevolcano.world which will run from 7th–10th of October 2025 in Niigata, Japan, endorsed by @iavcei.bsky.social. #volcano #science ⚒️🌋
An advertising flyer for a scientific symposium called "Volcanology in Practice". The flyer consists of a semi-transparent background image of Myoko volcano, Japan, overlain by text which reads: 
"www.thevolcano.world
Volcanology in Practice
international research symposium
7–10 October 2025
Niigata University, Japan"
Beneath the text is a QR code which directs to the website. Logos of two Niigata University departments are included at the top of the image. On either side of the QR code is a logo for Niigata University and IAVCEI, respectively.
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Jamie Farquharson @farquharson.bsky.social · 11/12/2024
A man of many vices
Many (workbench) vices
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
Compare the grey signal above with the weird loop-de-loop thing here ... This kind of complex post-failure behaviour—occurring under stress conditions relevant to the dome or shallow 🌋 edifice—could be crucial in regulating heat and mass transfer in volcanoes. Read more: 🔓🔗 doi.org/10.1098/rsos...
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
There should theoretically exist a zone in porosity–stress space where a rock can *repeatedly* switch deformation style. And lo–one of our samples exemplifies this quirky behaviour. First it compacts, then dilates, then compacts, then dilates, then compacts, then dilates…
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
In the paper we show C*’, as described above—compaction ➡️ dilation. We also demonstrate the opposite process—dilation to compaction, which we refer to as C’* (C prime star). As far as we know, we are the first to show this formally through experiments. But wait, there’s more!
A scanning electron microscope image of andesite from Ruapehu volcano, Aotearoa New Zealand. The andesite is light grey, punctuated by black pores and lighter-coloured crystals. Circled in cyan is evidence of cataclastic pore collapse in the direction of pre-existing fractures (highlighted by an arrow).
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
Turns out, there is, but we had to look in just the right place to find it. If we plot data from Heap et al. 2015 & Farquharson et al. 2016, 2017 as the “inelastic compaction factor” (don’t ask) vs initial porosity, there is an obvious gap. Luckily, we found some samples that fit in there nicely.
A graph of inelastic compaction factor against porosity. The inelastic compaction data are all positive at low porosity and negative at high porosity. A dashed boxed near the zero line indicates where there was a data gap before. Coloured symbols fill the box, indicating our new dataset.
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
Compare the two images below, one an as-collected sample of lava from Volcan de Colima, and the 2nd a sample from the same block, but having met C*’. It’s a mess—the groundmass has been smushed into tiny fragments (compaction), but note the fracture through the centre (dilation).
Side-by-side scanning electron micrograph images of andesite from Volcan de Colima, Mexico. The image on the left hand side exhibits many pores, relatively undamaged. The image on the right is mostly characterised by minute fragments of pulverised groundmass, with a signle fracture running through the centre from top to bottom.
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
The other side of the coin is compaction. For volcanic rocks, one of the most common compactant mechanisms is cataclastic pore collapse, when the rock around a pore crumbles and spalls into the pre-existing void space. This has the effect of occluding the pore, reducing porosity.
Scanning electron micrograph image of an andesite from Volcan de Colima, Mexico, exhibiting the initial stages of cataclastic pore collapse. Two pores in the rock are variably filled with spalling fragments of groundmass.
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
In that paper, for low-porosity rocks, continued application of stress led to fracture generation, coalescence, and evolution into a complex fault zone, all of which were favourable for fluid flow, (quantified as permeability). So, low porosity + stress = increased permeability.
Scanning electron microscope images illustrating the evolution of damage with strain during dilation of volcanic rocks from Kumamoto, Japan. The image is a four-panel collage of grayscale microscope images, each of which exhibits a through-running fracture from bottom left to top right. Image from Farquharson et al. 2016 Geophysical Research Letters.
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Jamie Farquharson @farquharson.bsky.social · 29/08/2024
We (me and ‪@rocklabstrasbourg.bsky.social‬) smash rocks because we want to know how strong they are, sure, but we are also interested in how mechanical deformation influences fluid flow.
A schematic of a scientific apparatus used for triaxially deforming rocks. The schematic is from Farquharson et al. 2017 Solid Earth.
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Jamie Farquharson @farquharson.bsky.social · 05/11/2023
Moving to Japan 🇯🇵 has been a gastronomic treat. One of my favourite discoveries (so far) has been Karashi Renkon, which is lotus root stuffed with miso and karashi mustard, deep fried in turmeric batter*. Had a go making it at home, thoroughly recommend. 🪷 *other versions do exist
Slices of battered lotus root with hot mustard filling its air holes, on a blue and white plate. Chopsticks in foreground.
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Jamie Farquharson @farquharson.bsky.social · 01/11/2023
I had the opportunity to answer some questions from Open Access Scholarly Publishing Association recently regarding Volcanica's inclusion in OASPA. Check out the full interview here: bit.ly/45VqMhS #AcademicSky 🧪⚒️🌋
“ OASPA is the nerve centre of a diverse, pandisciplinary community, and is therefore ideally positioned to facilitate cross-sector discussion and development in the open scholarship space. By facilitating knowledge and resource sharing and promoting best practices, OASPA directly contributes to the viability and sustainability of open access publishing in its various forms. OASPA has the capacity to actuate meaningful, practical changes in the global scholarly publishing ecosystem and Volcanica is enthusiastic about being able to learn from—and contribute to—something bigger than ourselves.” (Jamie I. Farquharson)
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Jamie Farquharson @farquharson.bsky.social · 25/10/2023
Volcanic bomb or dragon egg? Only one way to tell.
A grey, egg-shaped rock on an ash- and boulder-strewn plain. Photo taken from within Aso Caldera, Kumamoto (Japan) close to the currently active Aso volcano. The rock is approximately 1.5 m along its longest axis.
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Jamie Farquharson @farquharson.bsky.social · 04/10/2023
Tough to choose, but this is one I'm really proud of: doi.org/10.1029/2018... It was an opportunity to collaborate with some folks who were already really close friends, and the first project I'd properly developed myself. Plus! All the results and analyses fell into place really nicely.
A four-panel image with photos of acid lakes in volcanic environments. (top-left) Crater Lake, Ruapehu, New Zealand (approximately 300 × 440 m). The lake is a pale blue, rimmed by craggy black basalts. There is snow in the foreground. (top-right) Emerald lakes, Tongariro, New Zealand (approximately 65 × 110 m). The lake is a rich emerald colour in the centre, abruptly grading to mustard-yellow and then rust-red at its edges. (bottom-left) Whakaari crater (White Island), New Zealand (approximately 500 × 275 m). Thick plumes of white steam rise from the green-white water. Grey tuffs and yellow-gold deposits of elemental sulphur can be seen in the foreground. (bottom-right) El Chichón, Chiapas, Mexico (approximately 370 × 470 m). The lakewater is a marbled mixture of greens, ranging from a pale pastel (like a weak matcha latte) to a deep, rich moss colour. 

[Photographs by Mike Heap, Jamie Farquharson, Jamie Farquharson, and Graeme Alexander William Sinclair, respectively.]
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Jamie Farquharson @farquharson.bsky.social · 25/09/2023
Figure 3 🤩 🌲🌳🌴
Figure 3 of Zylstra et al. DOI: https://doi.org/10.1111/1365-2435.14305. The four-panel image shows data on measured vegetation dynamics for Red Tingle Forests (Australia). The uppermost panel shows "Plant height" against "Years since fire", using tree silhouettes to illustrate the data.
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
Some of the best science is drinkable
A photograph of a Bialetti moka pot on a wooden workbench. It is wired to a circuit board with a set of resistors, in turn attached to a 9V battery. Behind the moka is a graduated cylinder of water.
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
☕ Coffee is delicious, but it can also help us think about geological processes. Check out this piece from Geoscientist: geoscientist.online/sections/une... The moka pot is a mechanical marvel, and can help us conceptualise a variety of Earth science processes!
Illustration of a floating moka pot pouring coffee into a porcelain cup. Both the moka and the cup are cut away in cross-section to reveal the inner workings.
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
One I'm fond of is Timothy Gwyn's "Avians", where I had the opportunity to do some pressure wave propagation calculations to double check a particular scene was viable. Fun stuff. It is one of only *sobs* 11 books to travel with me to Japan
Me excitedly holding “Avians” by Timothy Gwyn
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
Speaking of open access in academia: I am a big advocate. This is something I push for in roles as EiC of a diamond OA journal, Secretary of the Free Journal Network, and various other OA initiatives. If you look at Open Access on Wikipedia, that's my illustration! en.wikipedia.org/wiki/Open_ac...
Venn diagram highlighting the key features of different types of open access in scholarly publishing
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
3) The impacts of past and continuing climate change on volcanic hazards. You can check out this recent open access publication here doi.org/10.1098/rsos...
Volcàn Fuego (Guatemala) erupts through the clouds. Photo by Caitlin Wynne via @unsplash.
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
2) The dynamics of rare silicic eruptions: this paper is a particular favourite on the subject  doi.org/10.1038/s414...
Scientific illustration of conceptual model of the “cryptic fragmentation” model for silicic hybrid and effusive eruptions, from Farquharson et al. 2022 https://doi.org/10.1038/s41467-022-32522-7. Inset is a photograph of an explosion plume at Cordon Caulle volcano in Chile.
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Jamie Farquharson @farquharson.bsky.social · 20/09/2023
1) Fluid flow processes in volcanoes, and how this affects explosive potential and volcano stability. Here's a little paper about how we can think about upscaling anisotropy in volcanic systems: doi.org/10.1016/j.jv...
Schematics of simple three-dimensional volcanic systems from Farquharson and Wadsworth (2018) https://doi.org/10.1016/j.jvolgeores.2018.09.002. The system on the left is layered like a layer cake, the one on the left has a concentric geometry like a vegetarian corndog.
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Jamie Farquharson @farquharson.bsky.social · 17/09/2023
Sometimes we absolutely should judge books by their covers
A paperback copy of "Beowulf" by Maria Dahvana Headley, on a red background alongside two dragonfruits. The cover of the book is a rich blue, with a stylised red letter "b" in lowercase, wearing a crown. The tail of a tragon is intertwined with the other cover elements. It is beautiful.
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Jamie Farquharson @farquharson.bsky.social · 12/09/2023
When "lofi beats to relax/study to" won't cut it
Screenshot of a Spotify playlist entitled "Ode to a thorny grant proposal," featuring The Smashing Pumpkins, Mademoiselle K, Dire Straits, PJ Harvey and more
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Jamie Farquharson @farquharson.bsky.social · 09/09/2023
Exploring Niigata prefecture
A Shinto shrine at the summit of Mt Yahiko in Japan's Niigata prefecture. The shrine is built from stone and encrusted in white lichen. It is surrounded by green vegetation.
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