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001     874425
005     20210130004655.0
024 7 _ |a 2128/24523
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037 _ _ |a FZJ-2020-01435
041 _ _ |a English
100 1 _ |a Bohlen, Thomas
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111 2 _ |a NIC Symposium 2020
|c Jülich
|d 2020-02-27 - 2020-02-28
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245 _ _ |a Applications of Seismic Full-Waveform Inversion on Shallow-Seismic and Ultrasonic Data
260 _ _ |a Jülich
|c 2020
|b Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
295 1 0 |a NIC Symposium 2020
300 _ _ |a 321 - 329
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490 0 _ |a Publication Series of the John von Neumann Institute for Computing (NIC) NIC Series
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520 _ _ |a Conventional seismic imaging methods utilise a small portion of the information in the seismic data we obtain. Most methods analyse their arrival times or specific signal amplitudes only. In this report we further develop and apply a new seismic inversion and imaging technique that uses the full information content of the seismic recordings. Full waveform inversion (FWI) is an algorithm that accounts for the full seismic waveform. It iteratively retrieves multiparameter physical models of the material by numerically solving the wave equation and optimisation problem. FWI is currently a cutting-edge seismic inversion and imaging technique that enables to exploit the full information contained in the seismic waveforms over a broad range of frequencies and apertures for an improved estimation of physical parameters. It allows for a mapping of structures on spatial scales down to approximately half of the seismic wavelength, hence providing a tremendous improvement of resolution compared to travel-time tomography based on ray-theory. We especially focus on the applications of FWI on two different scales, including near-surface scale which extends from Earth’s free surface to a depth around 10 meters and laboratory scale which targets on material from a few millimetre to less than one meter. Numerical tests and real-world applications are used to show the high resolution of FWI in reconstructing physical properties of the earth model and artificial material.
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700 1 _ |a Pan, Yudi
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700 1 _ |a Müller, Jonas
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