Seafloor geodesy

Burgmann, R, Chadwell D.  2014.  Seafloor geodesy. Annual Review of Earth and Planetary Sciences, Vol 42. 42:509-534.


april 2011, axial seamount, base-line tiltmeter, crustal deformation, de-fuca ridge, earthquakes, East Pacific, kilauea-volcano, monitoring, reservoir, rise, subduction zone, submarine volcanoes, tohoku-oki earthquake, transform-fault, trench axis


Seafloor geodetic techniques allow for measurements of crustal deformation over the similar to 70% of Earth's surface that is inaccessible to the standard tools of tectonic geodesy. Precise underwater measurement of position, displacement, strain, and gravity poses technical, logistical, and cost challenges. Nonetheless, acoustic ranging; pressure sensors; underwater strain-, tilt- and gravimeters; and repeat multibeam sonar and seismic measurements are able to capture small-scale or regional deformation with approximately centimeter-level precision. Pioneering seafloor geodetic measurements offshore Japan, Cascadia, and Hawaii have substantially contributed to advances in our understanding of the motion and deformation of oceanic tectonic plates, earthquake cycle deformation in subduction zones, and the deformation of submarine volcanoes. Nontectonic deformation related to down-slope mass movement and underwater extraction of hydrocarbons or other resources represent other important targets. Recent technological advances promise further improvements in precision as well as the development of smaller, more autonomous, and less costly seafloor geodetic systems.