Journal: Earthquake Science

Abbreviation

Publisher

Elsevier

Journal Volumes

ISSN

1867-8777
1674-4519

Description

Filters

2024 - 20252
Reset filters

Search Results

Publications 1 - 2 of 2
  • An illustrated guide to: Parsimonious multi-scale full-waveform inversion
    Item type: Journal Article
    Fichtner, Andreas; Thrastarson, Sölvi; van Herwaarden, Dirk-Philip; et al. (2024)
    Earthquake Science
    Having been a seemingly unreachable ideal for decades, 3-D full-waveform inversion applied to massive seismic datasets has become reality in recent years. Often achieving unprecedented resolution, it has provided new insight into the structure of the Earth, from the upper few metres of soil to the entire globe. Motivated by these successes, the technology is now being translated to medical ultrasound and non-destructive testing. Despite remarkable progress, the computational cost of full-waveform inversion continues to be a major concern. It limits the amount of data that can be exploited, and it largely inhibits quantitative and comprehensive uncertainty analyses. These notes complement a presentation on recent developments in full-waveform inversion that are intended to reduce computational cost and assimilate more data, thereby improving tomographic resolution. The suite of strategies includes flexible and user-friendly spectral-element simulations, the design of wavefield-adapted meshes that harness prior information on wavefield geometry, dynamic mini-batch optimisation that naturally takes advantage of data redundancies, and collaborative multi-scale updating to jointly constrain crustal and mantle structure.
  • An illustrated guide to: Distributed and integrated fibre-optic sensing in seismology
    Item type: Journal Article
    Fichtner, Andreas; Walter, Fabian Thomas; Paitz, Patrick; et al. (2025)
    Earthquake Science
    The properties of laser signals are affected by deformation of the optical fibre through which they are transmitted. While this deformation dependence is undesirable in telecommunication, it can be exploited for the construction of novel seismic sensors that fill a niche in data acquisition where traditional seismometer arrays would be difficult to deploy. This includes densely populated urban centers, the oceans, volcanoes and the Earth’s polar regions. These notes complement a presentation on recent methodological developments and applications in fibre-optic seismology. The first part is focused on the use of distributed fibre-optic sensing in cryosphere research, and specifically the investigation of the internal structure and seismicity of glaciers and ice sheets. The second part is dedicated to recent advances in integrated fibre-optic sensing, with emphasis on novel measurement principles and sensitivity.
Publications 1 - 2 of 2