Some limitations of shallow water geophysical devices imposed by different oceanographic and geological conditions

Comment on “Evidence from acoustic imaging for submarine volcanic activity in 2012 off the west coast of El Hierro (Canary Islands, Spain)” by Pérez NM, Somoza L, Hernández PA, González de Vallejo L, León R, Sagiya T, Biain A, González FJ, Medialdea T, Barrancos J, Ibáñez J, Sumino H, Nogami K and Romero C [Bull Volcanol (2014) 76:882-896]

“…1). Our findings highlight that the artifacts found by Pérez et al (2014) are lateral echoes or sideswipes due to close geological structures (Acosta et al 1996;Felix et al 2013) related to the irregular and abrupt seafloor morphology of the island which show numerous cone shaped features.…”