Volcanic Iceland: Earthquake with magnitude M 5,2 in Þorbjörn mountain (Fagradalsfjall mountain)!!!p1492

Short-Term Seismic Precursors to Icelandic Eruptions 1973–2014
Páll Einarsson*
Institute of Earth Sciences, University of Iceland, Reykjavík, Iceland
Networks of seismographs of high sensitivity have been in use in the vicinity of active volcanoes in Iceland since 1973. During this time, 21 confirmed eruptions have occurred and several intrusions where magma did not reach the surface. All these events have been accompanied by characteristic seismic activity. Long-term precursory activity is characterized by low-level, persistent seismicity (months-years), clustered around an inflating magma body. Whether or not a magma accumulation is accompanied by seismicity depends on the tectonic setting, interplate or intraplate, the depth of magma accumulation, the previous history and the state of stress. All eruptions during the time of observation had a detectable short-term seismic precursor marking the time of dike propagation toward the surface. The precursor times varied between 15 min and 13 days. In half of the cases the precursor time was <2 h. Three eruptions stand out for their unusually long duration of the immediate seismic precursory activity, Heimaey 1973 with 30 h, Gjálp 1996 with 34 h, and Bárðarbunga 2014 with 13 days. In the case of Heimaey the long time is most likely the consequence of the great depth of the magma source, 15–25 km. The Gjálp eruption had a prelude that was unusual in many respects. The long propagation time may have resulted from a complicated triggering scenario involving more than one magma chamber. The Bárðarbunga eruption at Holuhraun issued from the distal end of a dike that took 13 days to propagate laterally for 48 km before it opened to the surface. Out of the 21 detected precursors 14 were noticed soon enough to lead to a public warning of the coming eruption. In four additional cases the precursory signal was noticed before the eruption was seen. In only three cases was the eruption seen or detected before the seismic precursor was verified. In general, eruptions are preceded by identifyable short-term seismic precursors that, under favorable conditions, may be used for pre-eruption warnings. In some cases, however, the time may be too short to be useful. The Hekla volcano stands out for its short precursory times.
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Two earthquake swarms in Öræfajökull volcano

Posted on December 1, 2018 by Jón Frímann
Today (1-December-2018) two earthquake swarm took place in Öræfajökull volcano.

Largest earthquakes in this two earthquake swarms had magnitude of 1,1. All other earthquakes are smaller in magnitude. What is unusual now is that there are two earthquake swarms happening in Öræfajökull volcano. In last few months only one area has been having earthquakes at time. It is worth keeping a eye out for this change if it holds.
[link to www.jonfr.com]

Jesper Sandberg 02/12/2018 at 19:16
The network is more sensitive now than it was in 2000 s
Hekla is not a frequent erupter, we may still wait many years maybe 100 s of years for an eruption to arrive.

Reply
Carl Carl 02/12/2018 at 19:18
I can with a high degree of certainty state that this will not be the case Jesper.

Reply
mjf 02/12/2018 at 19:33
Do you think it will go off before the new year?

Reply
Carl Carl 02/12/2018 at 19:39
It’s not impossible. As it is looking now it could go off in a few hours. But, it could also go off in months or years away.

OT: HVO has spoken, and listed the possibilities for what’s next at Kilauea:

“New summit lava lake, resumption of eruption at Pu‘u ‘&#332;‘&#333;, lava flows in Puna, further summit collapses, explosive eruptions from the summit, eventual collapse of the entire summit, renewal of caldera filling with lava eventually overtopping the caldera rim, decreased magma supply so that the quiet lingers for years, increased magma supply so that the quiet ends in months, resumption of Mauna Loa activity…or something else?”

Earthquake activity in Þórðarhyrna volcano (Thordarhyrna)
Posted on December 3, 2018 by Jón Frímann

During the night of 3-December-2018 earthquake activity started in Þórðarhyrna volcano (no GVP profile, under Grímsvötn volcano profile). Largest earthquake in this swarm had a magnitude of 2,1 and second largest earthquake had a magnitude of 2,0.

Last eruption in Þórðarhyrna volcano was in the year 1902 December to 1904 12-January and was a VEI=4 eruption. An eruption happened in Grímsvötn volcano at the same time.
[link to www.jonfr.com]

Mount Etna again...
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More about Anak Krakatau volcano eruption/tsunami:
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Omg that are really good bumps!

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I think they are tectonic quakes, but i don't know what efects they made on volcano itself

Have you seen this drone footage from Anak? Amazing!

OMG!