Preprints

Filtering by Subject: Geophysics and Seismology

Bayesian inference on the initiation phase of the 2014 Iquique, Chile, earthquake

Cedric Twardzik, Zacharie Duputel, Romain Jolivet, et al.

Published: 2022-10-03
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

We investigate the initiation phase of the 2014 Mw8.1 Iquique earthquake in northern Chile. In particular, we focus on the month preceding the mainshock, a time period known to exhibit an intensification of the seismic and aseismic activity in the region. The goal is to estimate the time-evolution and partitioning of seismic and aseismic slip during the preparatory phase of the mainshock. To do [...]

Tsunami Early Warning from Global Navigation Satellite System Data using Convolutional Neural Networks

Donsub Rim, Robert Baraldi, Christopher M Liu, et al.

Published: 2022-09-29
Subjects: Earth Sciences, Geophysics and Seismology, Hydrology, Oceanography

We investigate the potential of using Global Navigation Satellite System (GNSS) observations to directly forecast full tsunami waveforms in real time. We train convolutional neural networks (CNNs) to use less than 9 minutes of GNSS data to forecast the full tsunami waveforms over 6 hours at select locations, and obtain accurate forecasts on a test dataset. Our training and test data consists of [...]

python-ags4: A Python library to read, write, and validate AGS4 geodata files

Asitha Senanayake, Roger Chandler, Tony Daly, et al.

Published: 2022-09-21
Subjects: Civil and Environmental Engineering, Earth Sciences, Engineering, Environmental Engineering, Geochemistry, Geology, Geophysics and Seismology, Geotechnical Engineering

Data gathered from geotechnical, geoenvironmental, and geophysical investigations can be broadly described as "geodata". The AGS4 data format is one of the most widely used data transmittal formats for geodata and is used across the world. It is a plain text format consisting of multiple tables of comma-separated values, tied together with a robust data schema and a comprehensive suite of [...]

Source location and wavefield characterization of river-induced seismic tremor- A case study near Avoca River, Ireland

Haleh Karbala Ali, Christopher J. Bean

Published: 2022-09-06
Subjects: Earth Sciences, Environmental Monitoring, Environmental Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

River-induced seismic signal (tremor) recorded by deploying seismic stations close to the river can be used to indirectly obtain the flow characteristics of rivers. We conducted an experiment next to Avoca River, County Wicklow, Ireland, where for the first time to our knowledge, we combined the application of beamforming array analysis by deploying two seismic arrays and Frequency-Dependent [...]

Locating Flowing Conduits in Karst Using Amplitude-based Passive Seismic Location Method

Haleh Karbala Ali, Christopher J. Bean

Published: 2022-09-06
Subjects: Earth Sciences, Environmental Monitoring, Environmental Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

The aim of this study is to develop methods for directly detecting energetic groundwater flow in sub-surface conduits through passive seismic applications, by detecting the small ground vibrations (seismic microtremor) that flowing water in the sub-surface may generate. This is in contrast to the current ‘traditional’ approach of attempting to actively image the conduits using geophysical and [...]

Sensitivity, Accuracy and Limits of the Lightweight Three-Component SmartSolo Geophone Sensor (5 Hz) for Seismological Applications

Martin Zeckra, Koen Van Noten, Thomas Lecocq

Published: 2022-09-03
Subjects: Geophysics and Seismology

The use of Nodal systems based on autonomous geophone-based instruments entered the field of Seismology only recently. These lightweight solutions revolutionized seismological fieldwork through lightweight and wholistic instruments that are faster to deploy and easier to handle. The IGU-16HR series of SmartSolo® is one example, but yet lacking a thorough lab-based performance analysis. Here, we [...]

Rapid fault healing after seismic slip

John Bedford, Takehiro Hirose, Yohei Hamada

Published: 2022-09-01
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Tectonics and Structure

Fault strength recovery (healing) following an earthquake is a key process in controlling the recurrence of future events; however, the rates and mechanisms of fault healing are poorly constrained. Here, by performing high-velocity friction experiments, we show that granite and gabbro fault gouges recover their strength rapidly after experiencing dynamic weakening during seismic slip. The healing [...]

Double surface rupture and hydraulic recharge of a three-fault system during the Mw 4.9 earthquake of 11 November 2019 at Le Teil (France)

André Burnol, Antoine Armandine Les Landes, Daniel Raucoules, et al.

Published: 2022-08-09
Subjects: Earth Sciences, Geophysics and Seismology, Hydrology, Numerical Analysis and Scientific Computing

The Mw 4.9 earthquake of 11 November 2019 at Le Teil (France) occurred at a very shallow depth (about 1 km) inducing the surface rupture of La Rouvière fault, nearby of a limestone quarry. Thanks to satellite differential interferometry, we detected the existence of the secondary surface rupture of the quasi-parallel Bayne Rocherenard fault. A newly processed seismic cross-section allowed us to [...]

Within the subducting Nazca Plate: The 2020 Mw 6.8 Calama earthquake and its similarity with the surrounding inslab seismicity

Carlos Herrera, Francisco Pasten-Araya, Leoncio Cabrera, et al.

Published: 2022-08-06
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

We study the 2020 MW 6.8 Calama earthquake sequence that occurred within the subducting oceanic Nazca plate. The mainshock is modeled via waveform inversion using a dynamic rupture model, while detection and location techniques are used to better characterize its aftershock sequence. We analyze the local seismotectonic and thermal context of the subducting Nazca plate to understand the trigger [...]

Resolving minute temporal seismic velocity changes induced by earthquake damage: The more stations, the merrier ?

Luc Illien, Christoph Sens-Schönfelder, Kuan-Yu Ke

Published: 2022-07-29
Subjects: Earth Sciences, Geophysics and Seismology

Ground shaking induced by earthquakes often introduces transient changes in seismic velocity monitored with ambient noise. These changes are usually attributed to relaxation behavior following the co-seismic damage in the subsurface and are of relevance for postseismic hazard mitigation. However, the velocity evolution associated with this phenomenon can occur at very small timescales and [...]

Machine Learning for Elastic-Electrical Cross-Property Modelling Of Sandstones

Phillip Andrew Cilli

Published: 2022-07-25
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Slab to back-arc to arc: fluid and melt pathways through the mantle wedge beneath the Lesser Antilles

Stephen Paul Hicks, Lidong Bie, Catherine Rychert, et al.

Published: 2022-07-15
Subjects: Earth Sciences, Geochemistry, Geophysics and Seismology, Tectonics and Structure, Volcanology

Volatiles expelled from subducted plates melt the overlying warm mantle, feeding arc volcanism. However, debates continue over the factors controlling melt generation and transport and how these determine the placement of volcanoes. To broaden our synoptic view of these fundamental mantle wedge processes, we image seismic attenuation beneath the Lesser Antilles arc, an end-member system that [...]

Comparison of methods for coupled earthquake and tsunami modeling

Lauren S Abrahams, Lukas Krenz, Eric M Dunham, et al.

Published: 2022-07-09
Subjects: Geophysics and Seismology

Tsunami generation by offshore earthquakes is a problem of scientific interest and practical relevance, and one that requires numerical modeling for data interpretation and hazard assessment. Most numerical models utilize two-step methods with one-way coupling between separate earthquake and tsunami models, based on approximations that might limit the applicability and accuracy of the resulting [...]

Seismic interferometry in the presence of an isolated noise source

Sven Schippkus, Roel Snieder, Celine Hadziioannou

Published: 2022-07-03
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Seismic interferometry gives rise to a correlation wavefield that is closely related to the Green's function under the assumption of uniformly distributed noise sources. In the presence of an additional isolated noise source, a second contribution to this wavefield is introduced that emerges from the isolated source location at negative lapse time. These two contributions interfere, which may [...]

Harnessing Distributed Acoustic Sensing for Earthquake Early Warning: Magnitude Estimation and Ground Motion Prediction

Itzhak Lior, Diane Rivet, Jean Paul Ampuero, et al.

Published: 2022-06-22
Subjects: Geophysics and Seismology

Earthquake Early Warning (EEW) systems provide seconds to tens of seconds of warning time before potentially-damaging ground motions are felt. For optimal warning times, seismic sensors should be installed as close as possible to expected earthquake sources. However, while the most hazardous earthquakes on Earth occur underwater, most seismological stations are located on-land; precious seconds [...]

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