Hannemann, Katrin

Kopp, Heidrun

Lange, Dietrich

Petersen, Florian

Urlaub, Morelia

OceanRep

Geophysical Research AbstractsVol. 20, EGU2018-10388, 2018EGU General Assembly 2018© Author(s) 2018. CC Attribution 4.0 license.Monitoring Seafloor Deformation: Acoustic Ranging Geodesy withMillimeter PrecisionFlorian Petersen (1), Heidrun Kopp (1), Dietrich Lange (1), Katrin Hannemann (1,2), and Morelia Urlaub (1)(1) GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany (flpetersen@geomar.de), (2) Institute for Geophysicsand Geology, University Leipzig, GermanyThe seafloor stores crucial information on sub-seafloor processes such as stress, strain, and earthquakes. Thisinformation can be extracted through the nascent scientific field of seafloor geodesy. Insitu measurements ofseafloor deformation in millimeter-level precision on normal, thrust and strike-slip faults have the capabilityto improve our understanding of oceanic plate creation, destruction or sliding alongside and provide valuableinformation to the physical behavior of fault systems or nontectonic areas as flank instabilities of ocean volcanoesor continental margins. In the last decade technological achievements enabled an increasing amount of acousticseafloor geodetic deployments. The acoustic ranging transponder networks measure relative positioning withmillimeter precision for a period of up to 3.5 years. The transponders also include high-precision pressure sensorsto monitor vertical movements and dual-axis inclinometers in order to measure their altitude as well as subsidenceor uplift of submarine fault zones. Further components as a self-steering autonomous surface vehicle (WaveGlider) or moored buoys are able to monitor transponders health and are able to download the seafloor geodeticdata to the sea surface and to transfer it via satellite.We discuss the acoustic ranging method and processing strategies, in particular the uncertainties imposedfrom variations of the water column result in water sound speed temporal changes. Furthermore, we discuss resultswith millimeter-scale resolution capabilities of different network configurations of ongoing geodetic deploymentsfrom Mt Etna, North Anatolian Fault and offshore Northern Chile.

Monitoring Seafloor Deformation: Acoustic Ranging Geodesy with Millimeter Precision

http://oceanrep.geomar.de/42750/1/EGU2018-10388.pdf

Monitoring Seafloor Deformation: Acoustic Ranging Geodesy with Millimeter Precision

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