Strong earthquake swarm on Reykjanes Ridge

Few moments ago (around 20:15 UTC) a strong earthquake swarm started on Reykjanes Ridge. This earthquake swarm is deep on the Reykjanes Ridge. Strongest earthquakes so far are ML3,1 on Reykjanes Ridge.

I am going to post updates as the swarm progresses. Some of the earthquakes can be seen on my webicoders here. But the distance is great so only strongest earthquakes are going to appear there.

Update at 21:06 UTC.

EMSC reports that the strongest earthquake was Mb4.8 while USGS is reporting that earthquake at Mb4.9 in size. The earthquake activity in this area is ongoing when this is written.

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169 Responses to Strong earthquake swarm on Reykjanes Ridge

  1. Tim says:

    Again, this is no more then an undersea eruption either happening or getting ready to happen. i just feel like people want to make it more then it really is.

    • Lurking says:

      Actually, it mainly appears to be graben movement. An axial view of the quake pattern marks out a rather clear fault block. on the southern side of the spreading center. Can there be volcanism? Sure.

      The interesting part about this is that south of here, the MAR expands by extension, and to the North, the MAR expands by dike emplacement. There is a lot more to it than just that, but it was worth noting.

  2. Mattias Larsson, Swe says:

    It seems likely that a eruption at Merapi is close now. Alert status is now on red and evacuations have been initiated. See

  3. Henry says:

    Looks like it’s windy on Iceland today, not much to read out of the helicorder.

  4. Luisport says:

    Magnitude Mw 6.1
    Region MOLUCCA SEA
    Date time 2010-10-25 12:05:27.9 UTC
    Location 0.03 S ; 125.17 E
    Depth 30 km
    Distances 166 km S Bitung (pop 137,364 ; local time 20:05 2010-10-25)
    140 km E Mobagu (pop 82,137 ; local time 20:05 2010-10-25)

  5. Daniel_Swe says:

    Yes IMO has issued a warning of gale force winds exceeding 20m/s so I guess the helicorders will be black for a while. 🙂

  6. Luisport says:

    Magnitude mb 4.7
    Date time 2010-10-25 12:59:17.3 UTC
    Location 49.94 N ; 29.02 W
    Depth 30 km
    Distances 1452 km W Cork (pop 188,907 ; local time 13:59 2010-10-25)
    1262 km NW Angra (pop 12,045 ; local time 12:59 2010-10-25)
    1214 km NW Lagoa (pop 9,239 ; local time 12:59 2010-10-25)

  7. Luisport says:

    Scientist Think Central Java’s Ancient Mt. Merapi May Be Gearing Up for a Cataclysmic Explosion.

  8. Pieter says:

    Sorry for this off-topic comment but this seems quite extraordinary:

    Magnitude 7.5 (Preliminary magnitude — update expected within 15 minutes)

    * Monday, October 25, 2010 at 14:42:25 UTC
    * Monday, October 25, 2010 at 09:42:25 PM at epicenter

    Location 3.100°S, 100.200°E
    Depth 33 km (20.5 miles) set by location program

    * 240 km (149 miles) S (184°) from Padang, Sumatra, Indonesia
    * 241 km (150 miles) WNW (288°) from Bengkulu, Sumatra, Indonesia
    * 416 km (259 miles) WSW (246°) from Jambi, Sumatra, Indonesia
    * 634 km (394 miles) SW (220°) from SINGAPORE

  9. Luisport says:

    Magnitude 7.5 (Preliminary magnitude — update expected within 15 minutes)
    Date-Time Monday, October 25, 2010 at 14:42:25 UTC
    Monday, October 25, 2010 at 09:42:25 PM at epicenter

    Location 3.100°S, 100.200°E
    Depth 33 km (20.5 miles) set by location program

  10. Pieter says:

    Jon, mayby it’s an idea to create some space somewhere on your beautiful blog for non-Icelandic issues?

  11. bozzy says:

    Its too deep.
    Love this blog btw Jón.

  12. bozzy says:

    Yeah the katla stuff has probably bought you a load of traffic from the conspiracy theorists.
    Now they are posting every big quake into the comments.

    • @bozzy, I don’t care about information about other areas of the world in the comments. It is good with me since it is about earthquakes and volcanoes. But I will not make it a topic here as a main rule.

  13. Jack @ Finland says:

    Has Merapi started? See the web cam:

  14. Pieter says:

    Strong tremor pulse at Godabunga in the Katla volcano.

  15. Stefan says:

    I don’t think theres a increased tremor in godabunga, because theres a weatherwarning out, means the increase in the blue signal might almost certainly be because of the strong wind.

  16. RonF says:

    Pieter, any idea when this stronger pulse started?

  17. Nick says:

    You have a good dry sense of humour Jon.

  18. Gabrielle says:

    Tsunami detected in Indonesia but no details as yet.

    • Gabrielle says:

      Not a significant event apparently. A SIGNIFICANT TSUNAMI WAS GENERATED BY THIS EARTHQUAKE.

    • Lurking says:

      You have to be able to propperly interprest sensationalist terms.

      SIGNIFICANT: “measurable”

      • Irpsit says:

        Yes, “measurable” enough to kill at least one hundred of people confirmed dead today. Check it on the news. Death toll from the tsunami continues to increase.

      • Lurking says:

        Either way, it’s still a local event. You will note that the extent of the “SIGNIFICANT” part of the tsunami didn’t cross county boundaries… likely not even major damage on the main island.

        Had the quake not been just off shore under their feet, this would probably been a non event…. except to news casters who value a stories worth by the number of bodies. or how much fear they can cause.

  19. Gabrielle says:

    @Jon – I saw your post on Big Think (Reviewing the little data that I have on Merapi volcano this looks quite bad indeed.) – any idea what is happening with Merapi now? The only webcam link I can get to open has gone from covered with smoke/steam/cloud to absolutely clear except for white pouring from the top of the volcano – the other links seems to be down. just had another look, it’s being obscured with that white stuff (excuse stuff but I don’t know what to call it!)

  20. Daniel_swe says:

    Refering to the link some posted regarding the “cataclysmic event” they fear…

    Here is the reasons i think the article is sensationalist nonsense…First they say that “Scientists are fearing that the ancient volcano of Mount Merapi in Central Java may be in imminent danger of a cataclysmic explosion”

    They do not refer to any specific scientist so this might as well be taken from any doomsday blog…

    If there was indeed a danger such as they describe there would be alot of esteemed scientists (named) giving their comments.

    And secondly..It eruptded in 2006 which would give the volcano a quite short time to both refill its magma reservoirs and on top of that in order to cause a cataclysmic event “that could threaten the lives of some 53,600 people” it would need to inject a whole lot more magma than the most recent eruption did.

    So i believe that the eruption itself will be impressive as most volcanoes are but not in a way described in the article..It seems like a journalist is seeking the next big scoop without knowing exactly what he is talking about…Not refering to any source that is..

    • Renato Rio says:

      Daniel_Swe: I agree with you. But given the amount of people living at this volcano’s feet who are refusing to evacuate it could yield to an unnecessary cataclysmic outcome, even if a smaller eruption occurs, which is very likely.
      The layers of ancient lava domes are rolling down in frequent avalanches and I don’t think it is any safe to get in their paths.
      Hopefully they will succeed in the evacuations efforts.

    • Raving says:

      There is some analytical justification for the worry provided here in Indonesian

      • Raving says:

        Apparently the rapid inflation is occurring in an old part of the edifice that has not seen any activity in the past 100 years. Hence the concern for a cataclysmic eruption.

      • Daniel_Swe says:

        The main reason i reacted to the article was the use of the word “cataclysmic”. 🙂 For me that spells certain doom in par with a supervolcano. A cataclysm is for me a world changing event.

      • Jack @ Finland says:

        Well, in page the word catalysmic is used already for a VEI 4 eruption! Supervolcanoes have the word “colossal” with some extras like “mega-colossal” reserved.

  21. Henrik says:

    If you check out earlier comments, there were references to an article in the Jakarta Globe – – in which the local head of the Volcano Investigation and Technology Development Institution (BPPTK) basically is quoted as saying that Merapi will have either a Pelean or a Plinian eruption. In all likelihood, the journalists have then googled Plinian and seen the word cataclysmic. Hence their “research” has yielded “the fact” that Mt Merapi is about to explode cataclysmically any second now.

  22. Henry says:

    What can this be?

    09:03:43 65,136 -19,562 4,4 2,5 70,46 29,8 km N af Hveravöllum
    08:33:10 65,138 -19,549 6,0 2,4 90,01 30,0 km N af Hveravöllum
    08:26:31 65,170 -19,599 3,0 2,2 90,01 33,7 km N af Hveravöllum
    08:15:58 65,168 -19,582 3,4 2,0 69,20 33,4 km N af Hveravöllum

  23. Jack @ Finland says:

    Merapi tremors have “exploded”…

  24. Daniel_Swe says:

    @ Henry – Yes that was a strange location. I have never seen EQ´s at that location. Jon do you know what that may be?

  25. Please see here about more detail information on this.

  26. Gabrielle says:

    Merapi has erupted!

  27. Evy says:

    I guss it’s about to happen again…
    Nice blog Jon!!

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