Posted on by Jón Frímann

Strong earthquake swarm in Bárðarbunga volcano during the night (of 7-September-2017)

During the night of 7-September-2017 strong earthquake swarm happened in Bárðarbunga volcano. Largest earthquake had the magnitude of 4,5 and the second largest earthquake had the magnitude of 4,1. Other earthquakes where smaller in magnitude. This is the strongest earthquake in Bárðarbunga volcano since August-2017.


The earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm was in north-east part of the Bárðarbunga volcano caldera. This area of the volcano has been earthquake active since August-2014 when current period of activity started. This time around no harmonic tremor was detected. That might not always be the case since it is my view that there is a risk of small short lived eruptions now in Bárðarbunga volcano with connected glacier floods. This time around it just didn’t happen.

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9 Replies to “Strong earthquake swarm in Bárðarbunga volcano during the night (of 7-September-2017)”

  1. I can’t find a way to do a private message…so I apologize for saying this in a public venue. Feel free to discard it if you wish.
    I found your time-stamp of “the night of 7 Sept. 2015” for the 4.5 Bardarbunga earthquake to be in conflict with the table on en.vedur.is that showed it clearly at 03:08 on the 7th of September.
    Now, in American English, any structure like “the night of January 31, 2001,” automatically means: the whole period of darkness _after_ the daylight period of Janurary 31, 2001.”
    If you want to specify events happening _before_ the daylight period of that date, specifically **between** 00.01 (American 12:01 a.m.) and dawn during January 31, 2001, you must say something like, “in the pre-dawn hours/wee hours/early hours of Jan. 31” or else give ann approximation that’s slightly more technical, such as, “between 1:00 and 3:00 a.m. on Jan. 31.”
    I cannot make pronouncements about the English used in the UK, South Africa, Australia, the Caribbean, or South Asia. Jeg kan lese på norsk, and I know a few other language, but unfortunately not Icelandic. My (American) English seems different from other European languages, so please be patient with me…after 40 years of teaching, I have trouble trying to quit teaching! 🙂
    Thank you for your attention.

  2. Please don’t be so pedantic. As a former English teacher of English I have no problem with Jon’s phraseology, in fact I thoroughly enjoy reading his comments. I wish I could speak and write one of the Scandinavian languages as well as he does English. I’m very much an amateur when it comes to Icelandic geology, but having recently realised my dream of visiting Iceland I say thank you to Jon for his information.

  3. Let’s hope this website holds up during Hurricane Irma. As it is hosted in Orlando, Florida. I will take a backup of this website tomorrow just in case and then I hope for the best.

    1. Let´s hope so, and also hope that somehow Irma blows a little of its power out (although that does not seem to be happening). Earth and weatherwise, we live in very interesting times. I imagine the Mexico quake was purely tectonic in origin?

  4. Jón, I would like to ask a question if I may. On 7th Sept between midnight and 9:00 am the conductivity dropped from 210 to just under 40. Do you know of any reason for such dramatic fluctuations?

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