La Palma eruption update 13th october 2021: La Laguna at risk from lava flows
The lava flows to the north of the flow field that prompted the evacuation of La Laguna on the 12th continue to advance, but in an uneven fashion. The furthest north branch of these flows, which was the one of main concern, is losing power and is advancing only slowly. However, the southern of these flows is currently the most active stream, and advances at approximately 50 m per hour. The current affected area of the lava flows is 640 hectares, 28 more than the previous day, and the maximum width of the lava flow field is 1,770 m. However, it was also stressed by PEVOLCA that the eruption is currently affecting only 8% of the island including areas affected by significant ashfall, and that the area covered by lava flows is still <1% of the land area of the island. Regarding eruptive activity, Strombolian activity is still seen from multiple vents within the main cone, and a reactivation of a more effusive vent on the SE flank of the main cone has been confirmed. Pulses of phreatomagmatic activity can also be seen.
For other eruption parameters, volcanic tremor increased throughout the day, although deformation continues to show no patterns in the closest stations to the eruption/ Earthquake activity was similar to the previous day and was concentrated at 10-15 km depth with some deeper (20-40 km) earthquakes. 71 events were recorded, peaking at 4.4 mbLg. The ash and gas plume reached 3000 m, and the SO2 emissions from the volcano remain relatively high at 17,774 tons per day, although this is an underestimate. Meteorological conditions remain unfavourable for ashfall on the south and eastern parts of the island, including the airport. However, both SO2 and PM10 concentrations remained below threshold values at all stations throughout the day.
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC, Copernicus EMS
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