Jamie Farquharson
@farquharson.bsky.social
Volcanologist • Archipelagan • Reads a lot • Tries hard • Professor @ Niigata University
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!
September 30, 2025 at 2:16 PM
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!
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.
September 30, 2025 at 2:16 PM
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.
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 ⚒️🌋
www.thevolcano.world
which will run from 7th–10th of October 2025 in Niigata, Japan, endorsed by @iavcei.bsky.social.
#volcano #science ⚒️🌋
July 29, 2025 at 7:06 AM
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 ⚒️🌋
www.thevolcano.world
which will run from 7th–10th of October 2025 in Niigata, Japan, endorsed by @iavcei.bsky.social.
#volcano #science ⚒️🌋
A man of many vices
December 11, 2024 at 6:58 AM
A man of many vices
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...
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...
August 29, 2024 at 3:37 AM
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...
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...
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…
August 29, 2024 at 3:34 AM
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…
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!
But wait, there’s more!
August 29, 2024 at 3:33 AM
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!
But wait, there’s more!
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.
August 29, 2024 at 3:32 AM
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.
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).
August 29, 2024 at 3:30 AM
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).
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.
August 29, 2024 at 3:27 AM
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.
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.
August 29, 2024 at 3:26 AM
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.
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.
August 29, 2024 at 3:24 AM
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.
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
*other versions do exist
November 5, 2023 at 11:06 AM
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
*other versions do exist
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
🧪⚒️🌋
#AcademicSky
🧪⚒️🌋
November 1, 2023 at 1:07 AM
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
🧪⚒️🌋
#AcademicSky
🧪⚒️🌋
Volcanic bomb or dragon egg? Only one way to tell.
October 25, 2023 at 9:16 AM
Volcanic bomb or dragon egg? Only one way to tell.
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.
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.]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:gvv2lzoyhhugmbnzcd6v4tac/bafkreidmodcrcuuyucrgxcjiqj7spgzm26novcdmpu37763gihhbcvzaay@jpeg)
October 4, 2023 at 1:02 AM
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.
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.
Figure 3 🤩 🌲🌳🌴
September 25, 2023 at 12:33 PM
Figure 3 🤩 🌲🌳🌴
Some of the best science is drinkable
September 20, 2023 at 7:30 AM
Some of the best science is drinkable
☕ 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!
geoscientist.online/sections/une... The moka pot is a mechanical marvel, and can help us conceptualise a variety of Earth science processes!
September 20, 2023 at 7:23 AM
☕ 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!
geoscientist.online/sections/une... The moka pot is a mechanical marvel, and can help us conceptualise a variety of Earth science processes!
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
September 20, 2023 at 7:09 AM
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
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...
en.wikipedia.org/wiki/Open_ac...
September 20, 2023 at 7:07 AM
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...
en.wikipedia.org/wiki/Open_ac...
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...
September 20, 2023 at 7:06 AM
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...
2) The dynamics of rare silicic eruptions: this paper is a particular favourite on the subject doi.org/10.1038/s414...
September 20, 2023 at 7:05 AM
2) The dynamics of rare silicic eruptions: this paper is a particular favourite on the subject doi.org/10.1038/s414...
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...
September 20, 2023 at 7:04 AM
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...