Some aspects of the seafloor morphology at Surtsey volcano: The new multibeam bathymetric survey of 2007

Abstract

A multibeam bathymetric survey in 2007. which included the area around Surtsey, allows a new interpretation to be made of aspects of the seafloor geology. it also provides support for previous observations and interpretations. The multibeam map brings to light features which the earlier, single beam surveys missed. Here, we describe the nature of the erosional platform around Surtsey, outline an area of probable pillow lava off southern Surtsey, and describe features in deep water (<120 m) which may have been formed by erosion. Sand waves in water depths up to 90 metres support the idea of strong bottom currents. The survey also allows an extrapolation of the known erosion history of Surtsey and surrounding vents (jólnir, Syrtlingur, and Surtla). knolls on the tops of Syrtlingur and Surtla are thought to be due to palagonitisation in the vicinity of the volcanic vents. Canyons in the northern submarine slope of Surtsey support previous observations of slope failure and sediment flow to the surrounding seafloor.