They’ve been saying the same thing about Cumbre Vieja - it could wipe out the Eastern seaboard of the USA. Funny thing is, it slipped a few yards in the 1950’s but did not fall into the ocean.
Steven N. Ward
Institute of Geophysics and Planetary Physics, University of California, Santa Cruz California, USA
Simon Day
Benfield Greig Hazard Research Centre, Department of Geological Sciences, University College, London, UK
Abstract:
Geological evidence suggests that during a future
eruption, Cumbre Vieja Volcano on the Island of La Palma
may experience a catastrophic failure of its west flank, drop-ping 150 to 500 km^3 of rock into the sea.
Using a geologically reasonable estimate of landslide motion, we model tsunami waves produced by such a collapse. Waves generated by the run-out of a 500 km^3 (150 km^3) slide block at 100 m/s could transit the entire Atlantic Basin and arrive on the coasts of the Americas with 10-25 m (3-8 m) height ...”
Actual paper is on pdf file.
Link here:
http://www.es.ucsc.edu/~ward/papers/La_Palma_grl.pdf