Both underwater and on land.
11 Nov 11 – In a press conference today, the director of the National Geographic Institute (IGN) in the Canary Islands, José María Blanco, explained that crustal deformation and seismic data from the last four days point to a possible submarine eruption north of El Hierro, and perhaps an eruption on land.
Earthquakes to the north of the island, “far from diminishing, continue to grow in magnitude,” said Blanco. This implies that something could be about to happen.
As to the underwater eruption of La Restinga “the scenario remains the same.” That eruption continues to broadcast material and maintains a constant amplitude tremor, although there is no bubble on the sea surface or thermal anomalies.
(We were advised yesterday that ocean temperatures in the area had risen to 95F, so I’m not sure how Blanco can say there are no thermal anomalies.)
See original article in Spanish: