Johan O. A. Robertsson
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View article: Fibre-Optic Monitoring of Seismic Events from an Alpine Slope Instability: Insights into Spatial and Temporal Dynamics
Fibre-Optic Monitoring of Seismic Events from an Alpine Slope Instability: Insights into Spatial and Temporal Dynamics Open
Slope instabilities represent a significant hazard to communities and infrastructure across various regions worldwide. Climate change and resultant increasing severe precipitation events potentially raise the risk of failing mass movements…
View article: LunarLeaper - Unlocking a Subsurface World
LunarLeaper - Unlocking a Subsurface World Open
LunarLeaper is a mission concept designed to robotically explore subsurface lava tubes on the Moon. Lunar pits, steep-walled collapse features, are thought to be connected to such lava tube systems and more than 300 have been identified th…
View article: On the benefit of collecting the seismic divergence using Distributed Acoustic Sensing with coiled fiber
On the benefit of collecting the seismic divergence using Distributed Acoustic Sensing with coiled fiber Open
Distributed Acoustic Sensing (DAS) captures the longitudinal strain fluctuations along fiber optic cables. With locally straight cables, the measurement is closely related to the horizontal gradient of the horizontal velocity fields ∂…
View article: Lunarleaper – Unlocking a Subsurface World
Lunarleaper – Unlocking a Subsurface World Open
We present LunarLeaper, a robotic explorer concept in response to the ESA 2023 Small Missions call. Pits, volcanic collapse features with near-vertical walls, have been identified across the lunar and Martian surface. These pits are high p…
View article: High-resolution 3D seismic characterization of an Alpine slope instability using a 1'000 node array
High-resolution 3D seismic characterization of an Alpine slope instability using a 1'000 node array Open
Slope instabilities, further destabilized by global warming and extreme weather conditions, pose increasing risks to life and property. Hence, understanding these potentially destructive phenomena is crucial to mitigate associated losses. …
View article: In‐Sensor Passive Speech Classification with Phononic Metamaterials
In‐Sensor Passive Speech Classification with Phononic Metamaterials Open
Mitigating the energy requirements of artificial intelligence requires novel physical substrates for computation. Phononic metamaterials have vanishingly low power dissipation and hence are a prime candidate for green, always‐on computers.…
View article: Acoustic cloning
Acoustic cloning Open
ISSN:2331-7019
View article: Applications of Time‐Frequency Domain Polarization Filtering to InSight Seismic Data
Applications of Time‐Frequency Domain Polarization Filtering to InSight Seismic Data Open
The seismometer Seismic Experiment for Interior Structure (SEIS) onboard the InSight lander was used to continuously record the seismicity on Mars from February 2019 to December 2022. To maximize the information that can be extracted from …
View article: Six-component wave type fingerprinting and filtering
Six-component wave type fingerprinting and filtering Open
We present a technique to automatically classify the wave type of seismic phases that are recorded on a single six-component recording station (measuring both three components of translational and rotational ground motion) at the earth's s…
View article: Monitoring of an Alpine landslide using dense seismic observations: combining Distributed Acoustic Sensing and 1000 autonomous seismic nodes
Monitoring of an Alpine landslide using dense seismic observations: combining Distributed Acoustic Sensing and 1000 autonomous seismic nodes Open
Landslides are a major natural hazard that can cause significant loss of life and property damage around the world. As global temperatures rise and weather extremes become more frequent, we can expect an increase in the hazard emanating fr…
View article: Divergence-based estimation of Rayleigh wave dispersion curves
Divergence-based estimation of Rayleigh wave dispersion curves Open
We present a novel seismic acquisition and processing technique to efficiently evaluate the local dispersion curves of Rayleigh waves for subsequent inversion of shear velocities and near-surface characterization.The proposed approach cons…
View article: Efficient wave type fingerprinting and filtering by six-component polarization analysis
Efficient wave type fingerprinting and filtering by six-component polarization analysis Open
SUMMARY We present a technique to automatically classify the wave type of seismic phases that are recorded on a single six-component recording station (measuring both three components of translational and rotational ground motion) at the E…
View article: Efficient wave type fingerprinting and filtering by six-component polarization analysis
Efficient wave type fingerprinting and filtering by six-component polarization analysis Open
We present a technique to automatically classify the wave type of seismic phases that are recorded on a single six-component recording station (measuring both three components of translational and rotational ground motion) at the earth's s…
View article: Elastic immersive wave experimentation
Elastic immersive wave experimentation Open
SUMMARY We describe an elastic wave propagation laboratory that enables a solid object to be artificially immersed within an extended (numerical) environment such that a physical wave propagation experiment carried out in the solid drives …
View article: In Situ Regolith Seismic Velocity Measurement at the InSight Landing Site on Mars
In Situ Regolith Seismic Velocity Measurement at the InSight Landing Site on Mars Open
Interior exploration using Seismic Investigations, Geodesy and Heat Transport's (InSight) seismometer package Seismic Experiment for Interior Structure (SEIS) was placed on the surface of Mars at about 1.2 m distance from the thermal prope…
View article: Tri-linear representations for the Laser Interferometer Space Antenna
Tri-linear representations for the Laser Interferometer Space Antenna Open
The Laser Interferometer Space Antenna (LISA) is a space-borne observatory of gravitational waves to be launched by ESA and NASA in the 2030s. Interferometric measurements are made between three spacecraft orbiting the Sun. The measurement…
View article: In-situ regolith seismic velocity measurement at the InSight landing site on Mars
In-situ regolith seismic velocity measurement at the InSight landing site on Mars Open
Interior exploration using Seismic Investigations, Geodesy and Heat Transport's (InSight) seismometer package Seismic Experiment for Interior Structure (SEIS) was placed on the surface of Mars at about 1.2 m distance from the thermal prope…
View article: Internal absorbing boundary conditions for closed-aperture wavefield decomposition in solid media with unknown interiors
Internal absorbing boundary conditions for closed-aperture wavefield decomposition in solid media with unknown interiors Open
We present a method to create an internal numerical absorbing boundary within elastic solid media whose properties are largely unknown and use it to create the first wavefield separation method that retrieves all orders of outgoing elastic…
View article: The InSight HP$^3$ Penetrator (Mole) on Mars: Soil Properties Derived From the Penetration Attempts and Related Activities
The InSight HP$^3$ Penetrator (Mole) on Mars: Soil Properties Derived From the Penetration Attempts and Related Activities Open
The NASA InSight Lander on Mars includes the Heat Flow and Physical Properties Package HP$^3$ to measure the surface heat flow of the planet. The package uses temperature sensors that would have been brought to the target depth of 3--5 m b…
View article: Binary classification of spoken words with passive elastic metastructures.
Binary classification of spoken words with passive elastic metastructures. Open
Many electronic devices spend most of their time waiting for a wake-up event: pacemakers waiting for an anomalous heartbeat, security systems on alert to detect an intruder, smartphones listening for the user to say a wake-up phrase. These…
View article: Binary classification of spoken words with passive phononic metamaterials
Binary classification of spoken words with passive phononic metamaterials Open
Mitigating the energy requirements of artificial intelligence requires novel physical substrates for computation. Phononic metamaterials have a vanishingly low power dissipation and hence are a prime candidate for green, always-on computer…
View article: Elastic immersive wavefield modelling
Elastic immersive wavefield modelling Open
Many modelling studies of wave scattering require repeated numerical simulations through models with properties that differ only in a small sub-domain. Hence, it is of interest to recompute the wavefields that account for wave propagation …
View article: Finite-difference modelling of 2-D wave propagation in the vicinity of dipping interfaces: a comparison of anti-aliasing and equivalent medium approaches
Finite-difference modelling of 2-D wave propagation in the vicinity of dipping interfaces: a comparison of anti-aliasing and equivalent medium approaches Open
SUMMARY Finite-difference (FD) modelling of seismic waves in the vicinity of dipping interfaces gives rise to artefacts. Examples are phase and amplitude errors, as well as staircase diffractions. Such errors can be reduced in two general …
View article: Broadband acoustic invisibility and illusions
Broadband acoustic invisibility and illusions Open
The active manipulation of sound waves replaces physical with virtual media to create acoustic invisibility and illusions.
View article: A Reconstruction Algorithm for Temporally Aliased Seismic Signals Recorded by the InSight Mars Lander
A Reconstruction Algorithm for Temporally Aliased Seismic Signals Recorded by the InSight Mars Lander Open
In December 2018, the NASA InSight lander successfully placed a seismometer on the surface of Mars. Alongside, a hammering device was deployed at the landing site that penetrated into the ground to attempt the first measurements of the pla…
View article: FD-injection-based elastic wavefield separation for open and closed configurations
FD-injection-based elastic wavefield separation for open and closed configurations Open
SUMMARY An important step in the processing of seismic data that are recorded at the free surface is the isolation of the primary incident wavefield from the total recorded wavefield (which is contaminated with the immediate reflections of…
View article: Finite-difference modeling of 2-D wave propagation in the vicinity of dipping interfaces: a comparison of anti-aliasing and equivalent medium approaches
Finite-difference modeling of 2-D wave propagation in the vicinity of dipping interfaces: a comparison of anti-aliasing and equivalent medium approaches Open
Finite-difference (FD) modeling of seismic waves in the vicinity of dipping interfaces gives rise to artifacts. Examples are phase and amplitude errors, as well as staircase diffractions. Such errors can be reduced in two general ways. In …
View article: On the use of Distributed Acoustic Sensing for seismic divergence and curl estimations
On the use of Distributed Acoustic Sensing for seismic divergence and curl estimations Open
<p>Distributed Acoustic Sensing (DAS) is becoming an established tool for seismological and geophysical applications. DAS is based on Rayleigh scattering of light pulses conveyed in fibre optic cables, enabling unprecedented strain r…