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The new island of lava is now half kilometer wide (500m) and 40 meters high. And now, according to the director of the National Geographic Institute (IGN) in the Canary Islands, María José Blanco, it is in danger of cracking and collapsing into the sea.

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The lava island has grown as large as the cliff it poured over and is still expending. If it continues, the delta will destabilize and could easily split and collapse into the sea, releasing gases abruptly, triggering explosions from chemical reactions, and producing large waves.

Such a collapse wouldn’t, however, trigger a dangerous tsunami that would devastate nearb islands, Europe or even the US.

Hazards of delta collapse

La Palma update: Lava delta collapse
La Palma update: Lava delta is growing

There are several hazards to this. Getting too close to an ocean entry, either on land or from the sea, is potentially deadly. Primary hazards include:

  • Sudden collapse of a lava delta (new land created at ocean entry) and the adjacent sea cliff into the ocean
  • Large explosions triggered by delta collapse.
  • Waves of scalding hot water from ocean swells and delta collapse.
  • Steam plumes that rain hydrochloric acid and tiny volcanic glass particles downwind from the entry point.
La Palma update: Lava delta collapse
La Palma update: The lava delta grows from behind but becomes instable.

Lava deltas collapse without warning

Lava entering the ocean builds a delta on top of unstable lava fragments along the steep submarine slope. As the delta grows seaward and laterally along the shoreline, it may slowly settle or sink as the loose rock debris shifts under the weight of overlying lava flows.

La Palma update: Lava delta collapse
La Palma update: Lava delta collapse triggers explosion and scalding wave

All or part of the delta can collapse into the ocean when the underlying debris can no longer support the delta’s growing mass or is undercut by a deeper submarine landslide. The collapses occur suddenly or over a period of several hours.

Delta collapses can also produce waves both onshore and offshore, which can imperil boats next to a collapsing delta.

Cumbre Vieja North Face collapse

Involcan, the Canary Islands Volcanological Institute have reported that the north face of the Cumbre Vieja volcano partially collapsed on October 9, 2021.

New volcanic material is flowing out in various direction and is beginning to create a new path of destruction.

New lava ‘tongue’

A new lava ‘tongue’ is forming as one of the flows has separated from the main path and is making its own way to the sea destroying buildings and banana plantations.

This new flow is located about 150 meters from the sea heading towards the beach of El Charcón.

Bad air quality

Yesterday, the scientific committee was concerned about air quality, which is expected to improve today due to the change in weather conditions, which will favour the dispersion of gases. The dense ash continues to thin the air in the north and east of the island, impeding air traffic.

Meanwhile, La Palma airport has reopened again: