Yesterday (23-April-2015) there where deep earthquakes in Katla volcano. So far only six deep earthquakes have been recorded. The deepest earthquake had the depth of 26,6 km. The largest earthquakes in this swarm had the magnitude of 2,2.
Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.
Earthquake activity at this depth is rarely due to tectonic activity, it is mostly due to magma movements or pressure changes of the magma. It is impossible to know for sure what is going on. No harmonic tremor was detected following this earthquake activity and there is nothing suggesting anything else then just earthquake activity in Katla volcano at the moment.
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Article updated at 16:21 UTC.
M 7.8 – 34km ESE of Lamjung, Nepal
2015-04-25 06:11:26 UTC 28.147°N 84.708°E 15.0 km
On Jon’s BHRZ station it arrives at 06:22
http://www.jonfr.com/webicorders/bhrz.gif
On Icelandic tremor charts it looks like this:
http://hraun.vedur.is/ja/vatnajokulsvoktun/oroi_kre.html
http://hraun.vedur.is/ja/vatnajokulsvoktun/oroi_mko.html
http://hraun.vedur.is/ja/vatnajokulsvoktun/oroi_grf.html
You can see how this Nepal earthquake appeared on long period seismometers around the world here.
http://www.jonfr.com/webicorders/othersten.htm
Harmonic signal detected at GRF.
http://hraun.vedur.is/ja/oroi/grf.gif
This is a wind noise, there is a winter storm passing over Iceland at the moment.
with all due respect, considering how low tuned GRF is, and considering how wind noise usually looks like, and considering how this wind storm looks like on the other nearby stations, all in all, I doubt that this is pure wind noise, just like the signal on April 1st, when there wasnt a strong storm moving over.
http://hraun.vedur.is/ja/vatnajokulsvoktun/grf1_trem.gif
IMHO of course 🙂
I’m not able to refresh the drumplots anymore, did they change the address of the server?
http://hraun.vedur.is/ja/drumplot/von.png