Thomas Bohlen
YOU?
Author Swipe
View article: Seismic crosshole full‐waveform inversion of high‐frequency SV‐waves for glacial sediment characterization
Seismic crosshole full‐waveform inversion of high‐frequency SV‐waves for glacial sediment characterization Open
We present a two‐dimensional, high‐resolution full‐waveform inversion approach of crosshole seismic data to image fine glacial sediments in an overdeepened Alpine valley, the Tannwald Basin (ICDP site 5068_1) north of Lake Constance. A ver…
View article: High-resolution SH-wave crosshole seismic full-waveform inversion in the glacially overdeepened Tannwald Basin
High-resolution SH-wave crosshole seismic full-waveform inversion in the glacially overdeepened Tannwald Basin Open
During the Quaternary, the Rhine Glacier formed several overdeepened valleys, including the Tannwald Basin (ICDP site 5068_1, Germany) about 45 km North of Lake Constance. These structures form sedimentary climate archives and thus help to…
View article: A comprehensive crosshole seismic experiment in glacial sediments at the ICDP DOVE site in the Tannwald Basin
A comprehensive crosshole seismic experiment in glacial sediments at the ICDP DOVE site in the Tannwald Basin Open
Glaciers have shaped the Alpine landscape by carving deep valleys and depositing sediments to form overdeepened basins. Understanding these processes provides information on the evolution of the climate and landscape. One such overdeepened…
View article: High-resolution crosshole seismic imaging of glacial sediments by full-waveform inversion
High-resolution crosshole seismic imaging of glacial sediments by full-waveform inversion Open
During the Quaternary, glaciers shaped the Alpine region by excavating deep valleys and refilling them with the sediments that they transported. One such overdeepened valley is the Tannwald Basin (ICDP site 5068_1), which was created by th…
View article: A perfectly matched layer for first- and second order time-domain wave equation
A perfectly matched layer for first- and second order time-domain wave equation Open
The simulation of wave propagation is an essential part of several cutting-edge geophysical techniques, such as Full-Waveform Inversion (FWI) and Reverse Time Migration (RTM). Due to constraints in computational resources and memory capaci…
View article: Low-frequency shadow (LFS) as a tool for CO2 sequestration of Sleipner field North Sea
Low-frequency shadow (LFS) as a tool for CO2 sequestration of Sleipner field North Sea Open
Seismic low-frequency shadow (LFS) is a zone in the seismic data that is characterized by strong anomalously low-frequency energy compared to its surroundings and it occurs beneath a body that strongly attenuates the energy of the propagat…
View article: Indirect joint petrophysical inversion of shallow-seismic and multi-offset ground-penetrating radar field data
Indirect joint petrophysical inversion of shallow-seismic and multi-offset ground-penetrating radar field data Open
SUMMARY In near-surface surveys, shallow-seismic and ground-penetrating radar (GPR) full-waveform inversions (FWIs) have received increasing attention because of their ability to reconstruct high-resolution subsurface models. However, they…
View article: Development of an optimized, combined and high-resolution imaging method for the site investigation of radioactive repositories (DOSIS)
Development of an optimized, combined and high-resolution imaging method for the site investigation of radioactive repositories (DOSIS) Open
3D seismic measurements are a tool for high-resolution structural exploration of the subsurface using artificially generated seismic waves. Depending on the acquisition geometry and the seismic source, structures can be examined at depths …
View article: Multiparameter 2-D viscoelastic full-waveform inversion of Rayleigh waves: a field experiment at Krauthausen test site
Multiparameter 2-D viscoelastic full-waveform inversion of Rayleigh waves: a field experiment at Krauthausen test site Open
SUMMARY Full-waveform inversion (FWI) has been proven to be an effective tool for high-resolution multiparameter imaging of the shallow subsurface. It has been shown that the Gauss–Newton (GN) optimization method uses the off-diagonal info…
View article: Full-waveform inversion of ground-penetrating radar data in frequency-dependent media involving permittivity attenuation
Full-waveform inversion of ground-penetrating radar data in frequency-dependent media involving permittivity attenuation Open
SUMMARY Full-waveform inversion (FWI) of ground-penetrating radar (GPR) data has received particular attention in the past decade because it can provide high-resolution subsurface models of dielectric permittivity and electrical conductivi…
View article: Seismic Imaging of Complex Velocity Structures by 2D Pseudo-Viscoelastic Time-Domain Full-Waveform Inversion
Seismic Imaging of Complex Velocity Structures by 2D Pseudo-Viscoelastic Time-Domain Full-Waveform Inversion Open
In the presented study, multi-parameter inversion in the presence of attenuation is used for the reconstruction of the P- and the S- wave velocities and the density models of a synthetic shallow subsurface structure that contains a dipping…
View article: Indirect joint petrophysical inversion of synthetic shallow-seismic and multi-offset ground-penetrating radar data
Indirect joint petrophysical inversion of synthetic shallow-seismic and multi-offset ground-penetrating radar data Open
SUMMARY Both full-waveform inversion (FWI) of shallow-seismic and ground-penetrating radar (GPR) surface recordings have received particular attention in the past decade since they can reconstruct seismic and electromagnetic properties at …
View article: 3-D multicomponent full waveform inversion for shallow-seismic target: Ettlingen Line case study
3-D multicomponent full waveform inversion for shallow-seismic target: Ettlingen Line case study Open
SUMMARY In this work, we investigate methodological development and application of viscoelastic full waveform inversion to a multicomponent source and receiver data set at the near-surface scale. The target is located in Germany and lies i…
View article: Random‐Objective Waveform Inversion of 3D‐9C Shallow‐Seismic Field Data
Random‐Objective Waveform Inversion of 3D‐9C Shallow‐Seismic Field Data Open
Robustness and uncertainty estimation are two challenging topics in full‐waveform inversion (FWI). To overcome these challenges, we present the methodology of random‐objective waveform inversion (ROWI), which adopts a multi‐objective frame…
View article: Multiparameter viscoelastic full-waveform inversion of shallow-seismic surface waves with a pre-conditioned truncated Newton method
Multiparameter viscoelastic full-waveform inversion of shallow-seismic surface waves with a pre-conditioned truncated Newton method Open
SUMMARY 2-D full-waveform inversion (FWI) of shallow-seismic Rayleigh waves has become a powerful method for reconstructing viscoelastic multiparameter models of shallow subsurface with high resolution. The multiparameter reconstruction in…
View article: Joint petrophysical full-waveform inversion of the shallow-seismic and multi-offset GPR data
Joint petrophysical full-waveform inversion of the shallow-seismic and multi-offset GPR data Open
<p>Shallow-seismic surface wave and ground penetrating radar (GPR) are employed in a wide range of engineering and geosciences applications. Full-waveform inversion (FWI) of either seismic or multi-offset GPR data are able to provide…
View article: Time–frequency windowing in multiparameter elastic FWI of shallow seismic wavefield
Time–frequency windowing in multiparameter elastic FWI of shallow seismic wavefield Open
SUMMARY Full-waveform inversion of shallow seismic wavefields is a promising method to infer multiparameter models of elastic material properties (S-wave velocity, P-wave velocity and mass density) of the shallow subsurface with high resol…
View article: 2-D multiparameter viscoelastic shallow-seismic full-waveform inversion: reconstruction tests and first field-data application
2-D multiparameter viscoelastic shallow-seismic full-waveform inversion: reconstruction tests and first field-data application Open
SUMMARY 2-D full-waveform inversion (FWI) of shallow-seismic wavefields has recently become a novel way to reconstruct S-wave velocity models of the shallow subsurface with high vertical and lateral resolution. In most applications, seismi…
View article: Random objective surface-wave waveform inversion
Random objective surface-wave waveform inversion Open
<p>The full-waveform inversion (FWI) of surface waves, including both Rayleigh and Love waves, is becoming increasingly popular for near-surface characterizations. Due to the high nonlinearity of the objective function and a huge amo…
View article: Seismic characterization of waste disposals by full waveform inversion: possibilities and challenges
Seismic characterization of waste disposals by full waveform inversion: possibilities and challenges Open
Geophysical characterisation of potential geological sites for nuclear waste disposal is important to develop a repository design adequate to ensure safety and waste isolation. Seismic full waveform inversion (FWI) aims at a complete seism…
View article: Towards 3D 9C Elastic Full Waveform Inversion of Shallow Seismic Wavefields - Case Study Ettlingen Line
Towards 3D 9C Elastic Full Waveform Inversion of Shallow Seismic Wavefields - Case Study Ettlingen Line Open
International audience
View article: Application of a complete workflow for 2D elastic full-waveform inversion to recorded shallow-seismic Rayleigh waves
Application of a complete workflow for 2D elastic full-waveform inversion to recorded shallow-seismic Rayleigh waves Open
The S-wave velocity of the shallow subsurface can be inferred from shallow-seismic Rayleigh waves. Traditionally, the dispersion curves of the Rayleigh waves are inverted to obtain the (local) S-wave velocity as a function of depth. Two-di…
View article: Three-dimensional viscoelastic time-domain finite-difference seismic modelling using the staggered Adams–Bashforth time integrator
Three-dimensional viscoelastic time-domain finite-difference seismic modelling using the staggered Adams–Bashforth time integrator Open
We analyse the performance of a higher order accurate staggered viscoelastic time-domain finite-difference method, in which the staggered Adams–Bashforth (ABS) third-order and fourth-order accurate time integrators are used for temporal di…
View article: Individual and Joint 2-D Elastic Full Waveform Inversion of Rayleigh and Love Waves
Individual and Joint 2-D Elastic Full Waveform Inversion of Rayleigh and Love Waves Open
We investigate the performance of the individual 2-D elastic full-waveform inversion (FWI) of Rayleigh and Love waves as well as the feasibility of a simultaneous joint FWI of both wave types. The FWI of surface waves can provide a valuabl…
View article: Seismic Applications of Full Waveform Inversion
Seismic Applications of Full Waveform Inversion Open
Full waveform inversion (FWI) is a powerful imaging technique which exploits the richness of seismic waveforms. We further developed FWI to obtain multi-parameter images at high resolution. Here, we involve physical parameters, such as vel…