Measuring tectonic seafloor deformation and strain-build up with acoustic direct-path ranging.

Petersen, Florian , Kopp, Heidrun , Lange, Dietrich , Hannemann, Katrin and Urlaub, Morelia (2019) Measuring tectonic seafloor deformation and strain-build up with acoustic direct-path ranging. Open Access Journal of Geodynamics, 124 . pp. 14-24. DOI 10.1016/j.jog.2019.01.002.

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The Earth’s ocean floor deforms continuously under the influence of plate tectonic processes. In recent years, the development of deep-sea instruments using acoustic direct-path ranging allows observations of ocean floor deformation with unprecedented spatial and temporal resolution. Due to rapid technological progress, acoustic ranging emerged as a central research field to monitor seafloor deformation. Here we review recent developments and the progress of direct-path ranging applications. We discuss the methodology and examine the effects of the oceanographic environment on the measurement precision. Comparing the resolution of previous deployments, we find that the baseline uncertainty increases linearly with baseline length, at least for distances up to 3 km, but with different linear relations for each deployment. Measurements of displacement at millimeter-level precision across normal, thrust or strike-slip faults are discussed to evaluate the influence of dedicated network designs appropriate for the discrete fault geometries. Furthermore, tectonically quiet areas, such as flanks of coastal or ocean island volcanoes and passive continental margins pose substantial hazards that often lack in-situ monitoring and are therefore a significant target for the application of seafloor geodetic techniques.

Document Type: Article
Keywords: seafloor geodesy, acoustic ranging, seafloor monitoring, crustal deformation, earthquakes, submarine, landslides
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.jog.2019.01.002
ISSN: 0264-3707
Projects: GeoSEA, Future Ocean CP1635 "Towards real-time monitoring of submarine landslides", MARsite
Date Deposited: 10 Jan 2019 07:42
Last Modified: 08 Feb 2021 07:40

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