28 Dec The seismic noise returns to pre-eruptive levels.
The seismic noise returns to pre-eruptive levels.
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End of eruption. Pyroclastic activity has ceased but low level seismic events continue.
Since the last statement, a total of 96 earthquakes have been located on the island of La Palma, two of which have been felt by the population. The maximum magnitude registered is 3.5 (mbLg), corresponding to yesterday’s earthquake at 22:29 UTC, at a depth of 36 km. The minimum magnitude of the localized earthquake was 1.1 mbLg. Localized seismicity continues under the central area of Cumbre Vieja in the same areas as in previous days. The earthquakes are divided mainly into two groups, 46 of the earthquakes are located between 8 and 16km deep and 47 earthquakes were at depths greater than 30km. Likewise, 3 shallow earthquakes have been located in the area, with a depth of less than 3km. In the last 24 hours, no volcanic tremor has been observed in the records, keeping the seismic noise at levels close to the pre-eruptive period. Since the end of the volcanic tremor signal on December 13th at 10:20 pm, low-frequency (LP) events continue to be detected in addition to localized volcano-tectonic earthquakes. The network of permanent GNSS stations on the island does not show significant deformations that could be associated with volcanic activity. Using calibrated images IGN estimated at 08:20 UTC that no type of emission can be seen. The height of the cone was measured at 1,122 masl (IGN, 2021).