24 citations · 80 across the 11 of their papers we have counts for
13 papers
Borehole fibre-optic seismology inside the Northeast Greenland Ice Stream
Andreas Fichtner, Coen Hofstede, Lars Gebraad +3
Ice streams are major contributors to ice sheet mass loss and sea level rise. Effects of their dynamic behaviour are imprinted into seismic properties, such as wave speeds and anis…
Test experiments with distributed acoustic sensing and hydrophone arrays for locating underwater sound sources
Jörg Rychen, Patrick Paitz, Pascal Edme +3
Whales and dolphins rely on sound for navigation and communication, making them an intriguing subject for studying language evolution. Traditional hydrophone arrays have been used…
Long-range fiber-optic earthquake sensing by active phase noise cancellation
Sebastian Noe, Dominik Husmann, Nils Müller +2
We present a long-range fiber-optic environmental deformation sensor based on active phase noise cancellation (PNC) in metrological frequency dissemination. PNC sensing exploits re…
HMCLab: a framework for solving diverse geophysical inverse problems using the Hamiltonian Monte Carlo method
Andrea Zunino, Lars Gebraad, Alessandro Ghirotto +1
The use of the probabilistic approach to solve inverse problems is becoming more popular in the geophysical community, thanks to its ability to address nonlinear forward problems a…
Fiber-optic detection of snow avalanches using telecommunication infrastructure
Pascal Edme, Patrick Paitz, Fabian Walter +2
We demonstrate the detectability of snow avalanches using Distributed Acoustic Sensing (DAS) with existing fiber-optic telecommunication cables. For this, during winter 2021/2022,…
Linking distributed and integrated fiber-optic sensing
Daniel C. Bowden, Andreas Fichtner, Thomas Nikas +7
Distributed Acoustic Sensing (DAS) has become a popular method of observing seismic wavefields: backscattered pulses of light reveal strains or strain-rates at any location along a…
Sensitivity kernels for transmission fiber optics
Andreas Fichtner, Adonis Bogris, Daniel Bowden +6
Fiber-optic sensing technologies based on transmission offer an alternative to scattering-based Distributed Acoustic Sensing (DAS). Being able to interrogate fibers that are thousa…
Introduction to phase transmission fibre-optic sensing of seismic waves
Andreas Fichtner, Adonis Bogris, Thomas Nikas +6
This manuscript is concerned with phase changes of signals transmitted through deforming optical fibres. As a first result, it establishes an exact relation between observable phas…
Diffuse ultrasound computed tomography for medical imaging
Ines Elisa Ulrich, Christian Boehm, Andrea Zunino +2
An alternative approach to ultrasound computed tomography (USCT) for medical imaging is proposed, with the intent to (i) shorten acquisition time for devices with a large number of…
Analysis of core-mantle boundary seismic waves using full\-waveform modelling and adjoint methods
Maria Koroni, Anselme Borgeaud, Andreas Fichtner +1
Using spectral-element and adjoint methods, we investigate body waves interacting with the Earth's most dramatic interface, the core-mantle boundary (CMB). Intermediate-to-high fre…
Discovery of topological metamaterials by symmetry relaxation and smooth topological indicators
Cyrill Bösch, Tena Dubček, Frank Schindler +2
Robustness against small perturbations is a crucial feature of topological properties. This robustness is both a source of theoretical interest and a drive for technological applic…
Fully Parallel Mesh I/O using PETSc DMPlex with an Application to Waveform Modeling
Vaclav Hapla, Matthew G. Knepley, Michael Afanasiev +4
Large-scale PDE simulations using high-order finite-element methods on unstructured meshes are an indispensable tool in science and engineering. The widely used open-source PETSc l…
3D Wave-Equation-Based Finite-Frequency Tomography for Ultrasound Computed Tomography
N. Korta Martiartu, C. Boehm, A. Fichtner
Ultrasound Computed Tomography (USCT) has great potential for 3D quantitative imaging of acoustic breast tissue properties. Typical devices include high-frequency transducers, whic…