31 comments on “Concepcion – the volcano with feet of clay

  1. Thank you Agimarc, great article again, lots of stuff new to me here. So the volcano is standing on it’s clay base like a donkey on ice with all four sliding in a different direction? This must mean that it becomes broader and the Island bigger over time.


    • Right idea, but it is a bit more complex, as when you introduce more volcano into the lake from above the lake, it displaces water. Don’t know what the shoreline looks like. At first glance, the island should get bigger as the volcano gets wider and shorter. But if the water level comes up a bit, it could even out.

      The thing that worries me about this volcano is that it seems very well behaved. The way Murphy’s law works, is that if you say something won’t happen, it will happen instantly. What happens when it transitions to a new eruptive phase (basalt-heavy) is also unclear. Normally, when you introduce new basalt into a magma chamber full of crystal mush, it is the trigger for large eruptions. Why it doesn’t work that way with Concepcion has me scratching my head. Cheers –


  2. Great article! This is one of the few volcanoes I have actually climbed 🙂 Lovely almost perfectly cone shaped volcano with lots of strongly sulfur-smelling small fumaroles on the way up (and also wild Jocote berries/fruits right after you exit the rain forest 🙂 The ascent was fairly steep with lots of loose gravel, but not that hard. We didn’t quite reach the summit crater rim though.

    Omotepe is indeed well worth a detour (and not only for the volcanoes!) if you’re traveling through central america


  3. Preliminary! 16 minutes ago:
    M 6.2/6.5 – Redoubt Volcano/Southern Alaska – 124/91 km depth – USGS/EMSC
    Something is brewing there…

    Liked by 1 person

    • Howdy Granyia – This one was strongly felt here in ANC. Initial thump rolled for a while which faked us into thinking it was over until the surface wave hit then it rolled for a long while. This is not under Redoubt. It is south of Iliamna in Cook Inlet and north of Augustine, very deep, though. My Lovely Lady is not happy. No damage or rearranged shelf items that I know of. Went on for a while.


  4. Wouldn’t it be great to live in a country where the furniture rearranges itself every now and then? I always have to haul my sofa with my own bare hands…

    Hmm… USGS has it 15 km south of Iliamna and ESMC 21 km NW of Iliamna, both on land. Both points are roughly 80 km away from Augustine and 55 km from Mt. Redoubt. If it weren’t for the the depth I would guess Iliamna is rumbling, but with over 100 km deep it sounds rather purely tectonic… or what do others think?


    • Howdy Granyia – Too early to tell. Its depth indicates tectonic. This last round of quakes have mostly been 100 km deep – the ones near Talkeetna NW of ANC and this one. One of the interesting things about this one was considerations of the Katmai – Novarupta eruption a century ago. Katmai is roughly twice the distance from ANC that this quake was. It produced 5 – 7 7+ Richter quakes. I wonder how strongly felt they were here a century ago. Cheers –


  5. Hey, I’ve caught a bird again! On a webcam, that is – this time in Italy, near Napoli with Mt. Vesuvius in the background. Who would try an educated guess… or even knows what it is? First I thought it might be a bird of prey, but the beak is too straight, I think, and too reddish. A brown Seagull? A Skua perhaps? Any idea?


  6. Ah, now we know! They are really good at the AVO!!
    “Tuesday, July 28, 2015 8:30 PM AKDT (Wednesday, July 29, 2015 04:30 UTC)
    The M6.3 earthquake that occurred this evening at 6:35 PM AKDT near Iliamna Volcano was tectonic in nature and not related to the volcano. According to the Alaska Earthquake Center (AEC), it was located about 9 miles (15 km) SSW of Iliamna, at a depth of 73 miles (117 km). This depth indicates it occurred in the subducting (downgoing) slab, as opposed to in the crust immediately below the volcano.”



  7. Sinabung is ablaze! I don’t know why, I guess the feared dome collapse has taken place, or at least a big chunk of it has come down. I have been watching for half an hour, and it always looked liked this.
    I am making another time lapse, maybe that will tell us more.


    • Here it is. Yes it looks like a dome collapse event, with the debris still burning at the foot of the mountain. Click on it to start timelapse (opens in new tab).


  8. Good morning/evening all! Here are some details from the Piton de la Fournaise eruption and a webcam image a few minutes ago.

    From the Activity Bulletin of Friday, July 31 at 11:30
    24 hours after lowering the alert level to 1, the Piton de la Fournaise erupted again on July 31, 2015 at 9:20 local. This eruption was preceded by a seismic crisis of 90 min and 80 min of major deformation. The eruption was confirmed by a hiker and by observation of a plume, recording a flow at the Piton Partage station and an observation by the OVPF from the Pas de Bellecombe. The crack is located in North East Piton Kapor and stretches to the Nez Coupe Ste Rose. Alert level: ongoing Eruption, 2-2.

    From the Activity Bulletin of Friday, July 31 at 20:00
    The eruption that began this morning at 9:20 local continues tonight. Although the level of tremor has decreased slightly throughout the day, the intensity of the event remains important. A long crack approximately 1 km opened during several hours on a flat topographic zone in the North East of the Enclosure at the Pitons Kapor and Payenké. These cracks produced a dozen fountains that tonight would be more than five. The longest lava flow reached this afternoon the Plain of Osmunds. Recognition and levies on site were able to be conducted with the logistical assistance of SAG (Air Section of Gerndarmerie)
    Estimates of flow rates between 28 m3/s (first) and 11m3/s (thereafter) were produced from the gas measurements and are confirmed by satellite image analysis. The plume of volcanic gas reached tonight 3200-3500 m altitude. Alert level: ongoing Eruption.
    (Google transl. – http://www.ipgp.fr/fr/ovpf/actualites-ovpf)

    The small cinder cones piled up by the fountains are clearly to see, also occasionally some red-hot glow on the webcam (link above)


    • Very good, both videos, thanks dfm! The second reminds me of Holuhraun last September! 🙂 It seems that the fumes are not quite as toxic, as lots of people are walking near it in Reunion.


      • it’s a bit misleading. Actually the volcano is a huge attraction on the island, I heard of more than 2500 vehicles per day going up the volcano (island population is around 800 k). But the acess is severely restricted, only volcanologit can go nearer.


  9. Reunion was also in the news earlier last week due to part of a 777 found on the beach, reawakening the Malaysian Airlines Flight 370 search from a year and a half ago. Cheers –


  10. Update Gunung Raung: After a decline in activity for the previous two or three days, volcanic tremor as well as visible action rose again to new record hights. Lava fountains could be seen of 300-400m above the caldera rim. (given that the caldera is 500 m deep, that makes the fountains up to 900 m high!). From satellite images it is thought that a new cinder cone has built up on the caldera floor. An airport in northwesterly direction of the volcano closed again yesterday.



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