Blar i Bergen Open Research Archive på forfatter "Keers, Henk"
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Acoustic waveform inversion for ocean turbulence
Minakov, Alexander; Keers, Henk; Kolyukhin, Dmitriy; Tengesdal, Hans Christian (Peer reviewed; Journal article, 2017)The seismic oceanography method is based on extracting and stacking the low-frequency acoustic energy scattered by the ocean heterogeneity. However, a good understanding on how this acoustic wavefield is affected by physical ... -
Ambient noise levels and detection threshold in Norway
Demuth, Andrea; Ottemöller, Lars; Keers, Henk (Peer reviewed; Journal article, 2016-07)Ambient seismic noise is caused by a number of sources in specific frequency bands. The quantification of ambient noise makes it possible to evaluate station and network performance. We evaluate noise levels in Norway from ... -
Implications of 3D Seismic Raytracing on Focal Mechanism Determination
Newrkla, Katharina; Shiddiqi, Hasbi Ash; Jerkins, Annie; Keers, Henk; Ottemöller, Lars (Journal article; Peer reviewed, 2019)The purpose of this study is to investigate apparent first‐motion polarities mismatch at teleseismic distances in the determination of focal mechanism. We implement and compare four seismic raytracing algorithms to compute ...