chart showed two features that seem to originate from the Hawaiian islands of Oahu and Molokai. Moss et al. (1999) reported that the western flank of La Palma is static and there is no indication that it has moved since 1949, confirming the dimensions provided by Bonelli-Rubio (1950). Carracedo et al. (2001) state that they consider the crack to be a surface expression which is of a shallow and inactive nature. They also indicate that it should be monitored, but consider the possibility that the edifice is unstable as being almost non-existent. The Tsunami Society (2002) claim that the model used by Day et al. (1999), Ward and Day (2001), and Ward and Day (2005) is wrong. They caution about the claims made by Day et al. and Ward and Day, stating that there is no evidence of a mega-tsunami having been generated by volcanic edifice failure. Ward and Day (2003) reported on the only documented flank collapse of a volcanic island at that time—Ritter Island, that occurred on 13 March 1888 (a tsunami from a volcanic collapse happened subsequently to this paper in 2018 at Anak Krakatoa). Approximately 5 x 109 m3 (6.5 x 109 cu yd) of material—about two orders of magnitude less than the claimed mass of the Cumbre Vieja—generated a landslide which entered the ocean and generated a westerly-directed tsunami. The tsunami inundated adjoining islands and may have killed several hundred people. According to Cooke, damage was inflicted on islands several hundreds of kilometres from Ritter Island. There is no record of inundation occurring at trans-oceanic distances. The tsunami was witnessed by several Europeans living on many of the islands. Murty et al. (2005) claim that it is almost impossible for a trans-oceanic tsunami to be generated in the basin of the Atlantic Ocean, which—if correct—supports the work by many other researchers that the failure of the western flank of the Cumbre Vieja would be unlikely to generate a "mega-tsunami". Pérez-Torrado et al. (2006) indicate that marine deposits located between above sea level in the Agaete Valley of Gran Canaria resulted, when ~3 x 1010 m3 (3.9 x 1010 cu yd)—one order of magnitude less than that of models of Day et al.; (1999), Ward and Day, (2001); and Ward and Day, (2005),—of volcanic material collapsed, forming the Güimar Valle on Tenerife ~830 ka and generating a tsunami. They indicate that this collapse is the only