17 Oct La Palma eruption update 17th october 2021: The airport continues to be affected by ash

The eruption continues to show a strombolian mechanism with mixed explosive and effusive phases, with the effusive phase remaining the stronger of the two currently. The main active lava flows are the two branches to the north of the original flows. The southern branch of this flow has surpassed La Laguna Mountain to the south and is currently approximately 200 m from the coast. In the event that this flow reaches the sea, PEVOLCA confirmed a confinement of the population in Todoque would be ordered, similar to when the first flows reached the sea. The northern branch of the active flow is located above La Laguna and continues to advance slowly. The unfavourable meteorological conditions for ash dispersion persist and are affecting the operation of La Palma airport and some airspace in between La Palma, La Gomera and Tenerife.

17 Oct La Palma eruption update 16th october 2021: Advance of lava flows slows

Although the effusive phase of the eruption continues to be more powerful currently than the more explosive strombolian phase, the active lava flow fronts are currently barely advancing. This is because of the existence of lava tubes, although the flows continue to widen and grow in height. Ashfall has been concentrated on the eastern side of the island to include the airport, and consequently airport operations have been affected and are expected to continue to be affected by the ash in the coming days. The lava flows currently cover 724 hectares, and at its widest the flow field is now 2,350 m wide. Regarding the 5 cm inflation seen at the Jedey LP03 station on the 14th October, that signal has now completely reversed, and the rest of the stations do not show significant deformation.

15 Oct La Palma eruption update 15th october 2021: Advance of lava flows speeds up

The eruption continues to show a mixed strombolian mechanism, with both explosive and effusive phases, although currently the effusive phase is the more predominant one. This has been observed downstream as an increase in fluidity of the active lava flows as a result of the greater supply rate of magma. During the night, the stream furthest north advanced at up to 250 m per hour, although it has slowed down to 20-30 m per hour. The area affected by lava is now 696 hectares, with the maximum width of the flow field 1,770 m. Regarding the inflation of 5 cm has been seen at the LP03 station between Jedey and Las Manchas yesterday, today it has shown a partial reversal, and no significant signals are seen in any of the other stations. During the afternoon, an old vent 300 m SE of the main cone reactivated although only with ash emission, and its activity decreased overnight.

14 Oct La Palma eruption update 14th october 2021: 400 more people in La Laguna evacuated

New evacuations, on the night of the 13th and then on the morning of the 14th, have been ordered in La Laguna given the advance of the active lava flows to the north of the flow field. These have affected about 400 extra people, increasing the total number of evacuees from the eruption to around 6,400. The two branches of the northern-most lava flow are still active, with the wider southerly branch slowing down, but the more northern branch continues to advance towards La Laguna. Large blocks are observed being transported in the northern lava flow, which are remnants of small collapses of the cone. The eruption continues to show a strombolian mechanism with both explosive and effusive phases, producing pyroclastic deposits and lava flows.

13 Oct 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 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.

12 Oct La Palma eruption update 12th october 2021: More evacuations ordered

The confinement of several areas on the morning of the 11th due to the cement factory fire was lifted in the morning as the lava front has surpassed the sight and the air quality was assessed to be safe. However, further permanent evacuations of people were ordered in the morning by PEVOLCA, affecting 700-800 people in and around the settlement of La Laguna, due to the advancing lava flows to the north that affected the Callejón de la Gata industrial estate. There are two active lava flows, one that travels parallel and northwest of the original flow, and the second which prompted the new evacuation as moves very quickly. The original flows to the south, including the lava delta, remain inactive for now. Results from preliminary chemical and petrographic analyses of the lava flows and pyroclasts have been published for the first time, showing an evolution of the magma throughout the eruption from a more differentiated to a more primitive composition in the baseite-tephrite series. This is consistent with known historical eruptions on La Palma.

11 Oct La Palma eruption update 11th october 2021: Smoke from burning buildings forces confinements

A confinement of several population centres in Los Llanos de Aridane and El Paso totalling 3,500 people was ordered in the morning, due to the release of toxic gases from a large fire in a cement factory in the Callejón de la Gata industrial park, ignited by the northern active lava flow. There are currently three active lava streams: the original one feeding the lava delta, one to the south of the lava delta on the delta from the 1949 eruption, and the stream to the north which consists of two branches. The stream to the north currently has the greatest supply of lava, and has one branch affecting the industrial park, whilst the other branch is covering new ground in the direction of Todoque Mountain. To the north of Todoque mountain, the original stream is 300 m away from the coast and could form a second lava delta in the coming days if the supply of lava continues.

10 Oct La Palma eruption update 10th october 2021: New land to the north of affected by lava flows

The lava flows to the north of the lava flow field have been expanded as a result of the increased effusive activity caused by the rupture of the cone, including a lava flow that is covering new ground and is heading towards the part of Todoque not previously affected by the main lava flows. There are two branches of this flow, one to the south that has joined the previous flow, and one to the north which is travelling through the industrial estate and cement factory west of the town of La Laguna. At 2:30 pm local time, there was another partial collapse of the crater wall, releasing a large volume of lava as well as large blocks of the crater which were transported away by the lava flows. Currently, the lava exceeds 526 hectares, and the maximum width has also increased to 1,520 metres. The latest figures on destruction from Copernicus indicate 1,281 buildings affected, with 1,186 of those destroyed.

09 Oct La Palma eruption update 9th october 2021: Partial cone collapse creates two new lava streams

In the night between the 8th-9th, a partial collapse of the wall of the main cone caused a significant outpouring of lava as well as large blocks involved in the collapse. The outpouring created two new fluid lava streams, one travelling more to the north of the flow field and one further to the south, but both decreased in strength during the morning. The more southern flow especially is being monitored as it is contributing to the filling of a pronounced gully that, if completely filled, a breakout onto previously unaffected land could occur. It was commented that the partial collapse and subsequent change in morphology of the cone is a natural and repeated part of the eruptive process. Elsewhere, the new flow near the coast has still yet to reach the sea, and the lava delta is thought to have reached its maximum distance away from the cliffs, because it was reached the edge of the wave-cut platform. It continues to grow laterally along the coastline and has reached an area of 32 hectares.

08 Oct La Palma eruption update 8th october 2021: Airport operations affected by ash

The breakout lava flow that emerged on the 7th near the coast has covered over 40 hectares of new land, mostly destroying banana plantations, so the total affected area is now 471 hectares. The eruptive activity remains stable, with at least 3 strombolian vents in the main cone and now only a single vent on the flanks of the main cone, on the northern sector. The weather conditions remained unfavourable from an air quality perspective and also for ash deposition. Both La Palma airport and Tenerife North airport had operations affected by the accumulation of ash throughout the day, and it is not ruled out that La Gomera and Tenerife south airport could also be affected by ashfall. From tomorrow, however, meteorological conditions should allow being favourable for air quality and ash dispersion. A peak in SO2 concentrations was recorded in El Paso and Los Llanos between 6:00 and 8:00 am local time, although the hourly thresholds were not exceeded in either of the stations throughout the day. The daily threshold for PM10 concentrations was slightly exceeded in Los Llanos, but stayed below the threshold in all other stations.