Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Lars Gebraad"'
Autor:
Thomas L. A. Schouten, Lars Gebraad, Sebastian Noe, Anna J. P. Gülcher, Solvi Thrastarson, Dirk-Philip van Herwaarden, Andreas Fichtner
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-13 (2024)
Abstract Determining Earth’s structure is paramount to unravel its interior dynamics. Seismic tomography reveals positive wave speed anomalies throughout the mantle that spatially correlate with the expected locations of subducted slabs. This corre
Externí odkaz:
https://doaj.org/article/85a92c45c12c48d49958767f02bb3f1a
Autor:
Sara Klaasen, Solvi Thrastarson, Yeşim Çubuk-Sabuncu, Kristín Jónsdóttir, Lars Gebraad, Patrick Paitz, Andreas Fichtner
Publikováno v:
Volcanica, Vol 6, Iss 2, Pp 301-311 (2023)
We present a distributed acoustic sensing (DAS) experiment at Grímsvötn, Iceland. This is intended to investigate volcano-microseismicity at Grímsvötn specifically, and to assess the suitability of DAS as a subglacial volcano monitoring tool in g
Externí odkaz:
https://doaj.org/article/1fada8d2c5bd4753b38a4066931652f8
Autor:
Lars Gebraad, Andreas Fichtner
Publikováno v:
Seismological Research Letters, 94 (3)
The M series of chips produced by Apple has proven a capable and power-efficient alternative to mainstream Intel and AMD ×86 processors for everyday tasks. In addition, the unified design integrating the central processing and graphics processing un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5350151c9cb0fe862339dc76350fe34
http://arxiv.org/abs/2206.01791
http://arxiv.org/abs/2206.01791
Autor:
Sara Klaasen, Sölvi Thrastarson, Yeşim Çubuk-Sabuncu, Kristín Jónsdóttir, Lars Gebraad, Andreas Fichtner
We present the results of an experiment with Distributed Acoustic Sensing (DAS) on Grímsvötn in Iceland. DAS is a novel detection method that samples the strain wavefield due to ground motion along a fibre-optic cable with high temporal (kHz) and s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc32dfddef1ce2f1edd2ba93f30077de
https://doi.org/10.5194/egusphere-egu22-2529
https://doi.org/10.5194/egusphere-egu22-2529
We present a probabilistic approach to constrain the density distribution in the Earth based on surface wave dispersion. Despite its outstanding importance in studies of the Earth’s thermo-chemical state and dynamics, 3D density variations remain p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e8a22a54a4309ebffef420b60166bf3
https://doi.org/10.5194/egusphere-egu22-6399
https://doi.org/10.5194/egusphere-egu22-6399
Autor:
Lars Gebraad, Andreas Fichtner
We present `psvWave', a basic numerical finite difference solver for Python and C++, specifically targeted at seismologists. The solver is based on the well-established staggered grid approaches developed for the P-SV elastic wave equation. Although
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35c9ba09ddd5cba07641e87a10e59114
https://doi.org/10.31223/x5r91q
https://doi.org/10.31223/x5r91q
Publikováno v:
Geophysical Journal International, 227 (2)
We propose methods to efficiently explore the generalized nullspace of (non-linear) inverse problems, defined as the set of plausible models that explain observations within some misfit tolerance. Owing to the random nature of observational errors, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28460fdb9e766b4fe1980cbaf2586425
https://hdl.handle.net/20.500.11850/501454
https://hdl.handle.net/20.500.11850/501454
Uncertainty quantification is an essential part of many studies in Earth science. It allows us, for example, to assess the quality of tomographic reconstructions, quantify hypotheses and make physics-based risk assessments. In recent years there has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7814c747bb54840a2d635ea9bfb305cd
https://doi.org/10.5194/egusphere-egu21-16089
https://doi.org/10.5194/egusphere-egu21-16089
Autor:
Lars Gebraad, Arwen Deuss, Jeannot Trampert, Andreas Fichtner, Simon Schneider, Rûna van Tent
Constraints on the 3-D density structure of Earth’s mantle provide important insights into the nature of seismically observed features, such as the Large Low Shear Velocity Provinces (LLSVPs) in the lower mantle under Africa and the Pacific. The on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ade7c978394809ead258458f6ba085b7
https://doi.org/10.5194/egusphere-egu21-9852
https://doi.org/10.5194/egusphere-egu21-9852
Publikováno v:
EGUsphere
The Hamiltonian Monte Carlo method (HMC) is gaining popularity in the geophysical community to fully address nonlinear inverse problems and related uncertainty quantification. We present here an application of HMC to invert seismic data in the acoust
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::645c22251c9a7764bdea377e6789a8ad