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A swarm of intense earthquakes in the Reykjanes Peninsula, Iceland began on 24 October 2023, due to a magmatic intrusion underneath the area. The frequency and intensity of the earthquakes dramatically increased 10 November, with 20,000 tremors recorded by that time, the largest of which exceeded magnitude 5.2. An evacuation was ordered in the town of Grindavík, which is located near the area of the seismic activity. Large-scale subsidence in and around the town is reported to have caused significant damage.

Although earthquakes are a frequent occurrence in Iceland due to the island being situated at the boundary of the Eurasian and North American tectonic plates, the recent swarm was noted for being more extensive than usual. Three volcanic eruptions have occurred in the Reykjanes Peninsula since 2021, around the Fagradalsfjall volcano.

The 2023 earthquake swarm is associated with a magmatic intrusion estimated to be up to 15 kilometers long that runs in a south-westerly direction, starting at Kálfellsheiði ˈkʰaulˌfɛlsˌhei ðɪ and following the line of the Sundhnúkur ˈsʏntˌn̥u kʏr̥ crater chain at a depth of around 800 meters. The largest of the earthquakes originated under the Sundhnúkur craters but subsequently propagated south-west under Grindavík and into the sea.

The giphy gives us a better understanding of what's happening beneath the surface.

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