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La Palma update 11th September 2021: New seismic swarm detected

By Geotenerife 1 year ago
Home  /  VolcanoStories  /  La Palma  /  Day by Day  /  La Palma update 11th September 2021: New seismic swarm detected
 By Geotenerife  11th Sep 2021

La Palma eruption – 11th September 2021

Daily summary

Today, a cluster of 11 earthquakes at 9-14 km were recorded in the south of La Palma close to the Cumbre Vieja ridge, starting at 3:18 am local time. The largest event so far was a mbLg 1.5 earthquake and 11 km depth. This new seismic swarm is the first that has been detected since earthquake swarms in June and January 2021, which were largely clustered in similar areas but at depths deeper than 20 km. The swarm represents the 9th seismic swarm in southern La Palma since anomalous seismic activity began in the area in October 2017, which is thought to be related to magmatic reactivation of Cumbre Vieja. The shallow depth of these latest earthquakes, as well as the consistent locations with other swarms, are the most significant features, although the timescales nor the potential occurrence of any magmatic reactivation cannot be determined in the short-medium term.

Source: Instituto Geográfico Nacional (IGN)

A map showing locations of earthquakes. The earthquakes are located to the south of the island.

The location of earthquakes recorded on the 11th September by the Instituto Geográfico Nacional (IGN). The size of the dots show the relative size of the earthquake.

Earthquakes

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To see our full social media archive, visit our open data section or click here.

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Interactive Lava Flow Map

Notes: Use the button in the top right to open the map into full screen mode. Use the legend icon in the top left to see the legend and further information about the map. Click on individual days to see an outline of the lava flows on that day.

Interactive Earthquake Map

click here to enlarge

Notes: The size of the points represents the size of the earthquake, and the colour represents the depth. The map will also only show a certain number of points at once. For ease of use, we recommend you uncheck all dates and the satellite basemap from the legend in the top right, and inspect the earthquakes one day at a time.

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  Day by DayLa PalmaVolcanoStories
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