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SUMMARY:On or Off? Interpreting episodic tremor during the Fagradalsfjall 
 eruption  2021 - Eva P. S. Eibl - University of Potsdam
DTSTART:20230315T160000Z
DTEND:20230315T170000Z
UID:TALK182069@talks.cam.ac.uk
CONTACT:Yihe Xu
DESCRIPTION:The Fagradalsfjall eruption on the Reykjanes peninsula\, Icela
 nd\, lasted from 19 March to 18 September 2021. While it continuously effu
 sed lava at the beginning\, it opened up 7 further vents in April and focu
 sed the activity from late April on Vent 5. Surprisingly the continuous ef
 fusion changed to episodic lava effusion (as lava fountains or vigorous ov
 erflow) between 2 May and 14 June and 2 July to 18 September. This was rec
 orded seismically as tremor episodes. We examined the frequency of more th
 an 10000 lava fountaining episodes based on seismological data recorded at
  5.5 km and 2 km from the active vent.\n\nWe subdivide the time interval i
 nto 9 periods based on sudden changes in the fountaining duration\, repose
  time and seismic amplitude. We observed minute-long\, hour-long and one-w
 eek-long episodes as well as minute-long to hour-long to week-long repose 
 times. In addition\, for about 6 days it featured short and long episodes 
 at the same time much like geyser Strokkur (see Eibl et al. 2020)! So what
  triggered these changes and how can we interpret these changes? I will di
 scuss this in my presentation and will use some figures from our publicati
 on in review with Bull. Volc (see link below).\n\n"Link to paper in review
 ":https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fassets
 .researchsquare.com%2Ffiles%2Frs-1453738%2Fv1_covered.pdf%3Fc%3D1647444627
 &amp\;data=05%7C01%7Cyx362%40universityofcambridgecloud.onmicrosoft.com%7C
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 HoNzgaVE%2BxhoQcv20hibGMM9gGQA4IN%2BUUrI%3D&amp\;reserved=0 
LOCATION:Wolfson Lecture Theatre
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