Reykjanes Ridge earthquakes coincide with rise in seismic activity at Katla Volcano

October 8, 2011ICELANDThe Reykjanes Ridge, the part of the Mid-Atlantic Ridge that rises up to the ocean surface to the southwest of Iceland, has been hit by a series of earthquakes during the past 48 hours. The quakes have coincided with a surge in seismic activity in the vicinity of the Katla volcano in the south of Iceland. The European Mediterranean Seismological Center (EMSC) has recorded at least eight subsea earthquakes about 850 kilometres southwest of the Icelandic capital of SW Reykjavík (pop 113,906). The strongest of the quakes, a magnitude 5.7, was located 892 km southwest of the Icelandic capital Reykjavík. It hit at 00:39 GMT and was measured at a depth of just 10km, according to the EMSC. Meanwhile, the Icelandic Meteorological Office noted that an earthquake swarm occurred underneath the Mýrdalsjökull glacier in south Iceland on Wednesday and Thursday. Approximately 30-40 earthquakes were recorded on Wednesday and Thursday. The strongest earthquake measured ML3.55 and was measured to have hit at a depth of 1 kilometre. Seismic activity has since subsided. Only six earthquakes have been recorded at Mýrdalsjökull between 0000hrs and 1200hrs on Friday. Geophysicist Benedikt Ófeigsson told said that while the situation is being constantly monitored, it has not been considered necessary to alert Iceland’s Civil Defense Department. In recent weeks residents of Vik (population 300 approx.), located at the foot of Katla, have participated in emergency evacuation drills in the event of a volcanic eruption and subsequent glacial floods  affecting the small coastal town. –IWO
This entry was posted in Earth Changes, Earth Watch, High-risk potential hazard zone, Lithosphere collapse & fisssure, Potential Earthchange hotspot, Seismic tremors, Volcanic Eruption, Volcano Watch. Bookmark the permalink.

6 Responses to Reykjanes Ridge earthquakes coincide with rise in seismic activity at Katla Volcano

  1. offstart says:

    Is this the area of the Atlantic Ridge that is most likely to affect the East Coast of U.S. along with European coastal areas if a large earthquake or volcanic eruption occurs? I may be misinformed, but led to believe that if the Canary Islands get a heavy hit, it will most likely generate a large tsunami toward both continents. Since all part of the same ridge, what areas are most likely to be affected from this? Appreciate any information from someone more knowledgeable than myself as to the possibilites with a large earthquake or volcanic eruption in this Atlantic Ridge area. Would love it if someone can not only answer, but also direct me to tutorial information for learning this myself. Thank you.


  2. luisport says:

    Tremor pulses in Hamarinn volcano (most likely)
    Posted on October 8, 2011 by Jón Frímann
    During the past two weeks there have been tremor pulses in Hamarinn volcano (is claimed to be part of Bárðarbunga volcano system), at least most likely that volcano. But it might also be a volcano that I call Skrokkalda Volcano (other name might be Hágöngur volcano) (it has no entry on GVP web page, I do not know why). But given recent history I find it unlikely to be the case.

    This harmonic tremors might be due to dike intrusions. I find it unlikely to be from a man made lake called Hágöngulón that is in this area. The harmonic tremor pulses look like sharp spikes on the tremor plot on the Skrokkalda SIL station.
    This pattern of harmonic tremor spikes was seen all last year and all of the year 2009 from what I can remember. I do not have tremor charts from that period. But however this suggests that more magma has now started to flow into Hamarinn volcano. But there was a small volcano eruption (it seems so, given the flood that took place in July) in Hamarinn volcano last summer (summer 2011). What happens next is a good question.

    This process of inflow of magma seems to without earthquakes, or close to it. I do not know why that is and I have no ideas that explain it.


  3. luisport says:

    Carl le Strange says:
    October 8, 2011 at 08:22
    Yes, Krafla is unexpectedly active, tremor pulses, now and then juicy quakes at the spot of Krafla fires and so on.
    Problem is that we have entered both a Hotspot activity increase in the hotspot cycle, and at the same time we have entered a rifting period in Iceland. Together this will make pretty much every mainline volcano from Krafla in the north down to Vestmannaeyjar via Askja, Kverkfjöll, Bardarbunga, Hamarinn (if it is not a part of B), Grimsvötn, Hekla, Torfajökull, Eyjafjallajökull (probably done with erupting), Katla and Vestmannajökull. I do expect all of them to erupt at least once in the next hundred years, with the possible exception of Krafla and Eyjafjallajökull.
    Askja, Grimsvötn, Hekla and Katla will most likely erupt with a minimum of 20 times during that timeperiod.
    And, one of the eruptions from Katla, Bardarbunga or Grimsvötn will be a rifting fissure eruption.
    Am I doom and gloomy, I do not think so, it is within what is likely. Even IMO who is the least doom and gloomy agency on the planet, is making a volcanic hazard plan to mitigate what might come.
    The reason for me predicting it is only by using what could be said to be within the mainline of what the volcanos do during average time, then I added a rfting fissure eruption. The number of eruptions might even be higher if Hekla and Grimsvötn keap to their current higher pattern of eruptions. 5 eruptions each is rather low for those two…


  4. luisport says:

    Tsunami hazard related to a flank collapse of Anak Krakatau volcano, Sunda Strait, Indonesia (International Research)
    This could be problem:

    “Numerical modelling of a rapid, partial destabilization of Anak Krakatau volcano (Indonesia) was performed in order to investigate the tsunami triggered by this event. Anak Krakatau, which is largely built on the steep NE wall of the 1883 Krakatau eruption caldera, is active on its southwest side (towards the 1883 caldera), which makes the edifice quite unstable. A hypothetical 0.280 km3 flank collapse directed southwestwards would trigger an initial wave 43 m in height that would reach Sertung, Panjang and Rakata islands in less than 1 min, with amplitudes from 15 to 30 m. These waves would be potentially dangerous for the many small tourist boats circulating in, and around, the Krakatau archipelago.”


  5. luisport says:

    08.10.2011 16:16:26 64.176 -17.936 2.1 km 1.6 33.45 18.7 km NE of Laki


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