Modelling high-frequency seismograms at ocean bottom seismometers: effects of heterogeneous structures on source parameter estimation for small offshore earthquakes and shallow low-frequency tremors

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1093/gji/ggaa404. This is version 3 of this Preprint.

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Authors

Shunsuke Takemura , Suguru Yabe, Kentaro Emoto

Abstract

The source characteristics of offshore seismic events, especially regular (or fast) and slow earthquakes, can provide key information on their source physics and frictional conditions at the plate boundary. Due to strong three-dimensional heterogeneities in offshore regions, such as those relating to seawater, accretionary prism, and small-scale velocity heterogeneity, conventional methods using a one-dimensional Earth model may misestimate source parameters such as the duration and radiation energy. Estimations could become severe inaccuracies for small offshore seismic events because high-frequency (> 1 Hz) seismograms, which are strongl...  more

DOI

https://doi.org/10.31223/osf.io/ngy2j

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Earthquake source observations, earthquake ground motions, Nankai Trough, seismicity and tectonics, slow earthquake, wave propagation, wave scattering and diffraction

Dates

Published: 2020-04-18 03:13

Last Updated: 2020-08-24 16:21

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License

Academic Free License (AFL) 3.0