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Ragnar Heiðar Þrastarson (ragnarheidar@mastodon.social)'s status on Tuesday, 31-Dec-2024 23:14:32 JST Ragnar Heiðar Þrastarson

May annual #earthquake map 🎇
#Iceland is situated on the Mid Atlantic Ridge making it a very volcanically active. The ridge cuts the island in half from SW to the NE, slowly spreading it a part. Here are all the ~30000 earthquakes that have been verified and checked by the Icelandic Met Office staff
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1. A map of Iceland with earthquakes animated over time
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  Ben Brockert (wikkit@mastodon.social)'s status on Wednesday, 01-Jan-2025 05:41:21 JST Ben Brockert
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  @RagnarHeidar Interesting, thanks. I always appreciate a "we don't totally know" technical wikipedia article.
  I see that there's an even shorter one for the Azores. https://en.wikipedia.org/wiki/Azores_hotspot
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    Azores hotspot
    
    The Azores hotspot is a volcanic hotspot in the Northern Atlantic Ocean. The Azores is relatively young and is associated with a bathymetric swell, a gravity anomaly and ocean island basalt geochemistry. The Azores hotspot lies just east of the Mid-Atlantic Ridge Geological area The Azores domain comprises the Azores Plateau and the Azores archipelago (formed of 9 islands extending a distance of 480 km which have been volcanically active for around 7 Myr). The archipelago lies on the lateral branch of the Mid-Atlantic Ridge near the junction of three major tectonic plates; the North American Plate, the Eurasian Plate and the African Plate. This unique location causes the area to have ridge-hotspot interaction with a variation of volcanic processes. The Azores Plateau The Azores archipelago rises from Azores Plateau, which is an area of thickened oceanic crust thought to have formed over the last 20 Mya. Negative velocity S-wave anomalies have been mapped beneath the Azores in the upper 250–300 km. This has been suggested to be a signature of a plume that created...
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  Dr. Eric J. Fielding, PhD (ericfielding@mastodon.social)'s status on Wednesday, 01-Jan-2025 05:41:21 JST Dr. Eric J. Fielding, PhD
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  - Ben Brockert
  @wikkit @RagnarHeidar Yes, there are two different hot spots under Iceland and the Azores. Between them is normal mid-ocean ridge with thin crust forming.
  
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  Ben Brockert (wikkit@mastodon.social)'s status on Wednesday, 01-Jan-2025 05:41:22 JST Ben Brockert
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  @RagnarHeidar Neat animation!
  Maybe too big of a question, but will there eventually be a continent stretching from Iceland to the Azores as the Mid Atlantic Ridge gets above the surface, or does the ocean just keep getting wider?
  
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  Ragnar Heiðar Þrastarson (ragnarheidar@mastodon.social)'s status on Wednesday, 01-Jan-2025 05:41:22 JST Ragnar Heiðar Þrastarson
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  - Ben Brockert
  @wikkit Well, the reason there is an island where Iceland is located (and not elsewhere on the ridge) is because there is also a hot spot underneath: https://en.wikipedia.org/wiki/Iceland_hotspot
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    Iceland hotspot
    
    The Iceland hotspot is a hotspot which is partly responsible for the high volcanic activity which has formed the Iceland Plateau and the island of Iceland. It contributes to understanding the geological deformation of Iceland. Iceland is one of the most active volcanic regions in the world, with eruptions occurring on average roughly every three years (in the 20th and 21st century until 2010 there were 45 volcanic eruptions on and around Iceland). About a third of the basaltic lavas erupted in recorded history have been produced by Icelandic eruptions. Notable eruptions have included that of Eldgjá, a fissure of Katla, in 934 (the world's largest basaltic eruption ever witnessed), Laki in 1783 (the world's second largest), and several eruptions beneath ice caps, which have generated devastating glacial bursts, most recently in 2010 after the eruption of Eyjafjallajökull. Iceland's location astride the Mid-Atlantic Ridge, where the Eurasian and North American Plates are moving apart, is partly responsible for this intense volcanic activity, but an additional cause is necessary to explain why Iceland is a substantial island while...

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