Article
Geosciences, Multidisciplinary
Leonardo van der Laat, Mauricio M. Mora, Javier Fco Pacheco, Philippe Lesage, Esteban Meneses
Summary: This paper investigates the seismic records of the Turrialba volcano to identify precursory signals and understand the volcanic evolution. The long-term analysis reveals decreases in tremor amplitude and SO2 flux prior to eruptions. Volcano-tectonic seismicity suggests magma migration from Irazu volcano to Turrialba volcano, while harmonic tremor and tonal seismic signals serve as short-term precursors. The sealing and rupture of conduits gradually lead to eruptions. This seismic characterization provides valuable insights for monitoring and risk assessment.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Darren Tan, David Fee, Alicia J. Hotovec-Ellis, Jeremy D. Pesicek, Matthew M. Haney, John A. Power, Tarsilo Girona
Summary: Volcanic earthquake catalogs are crucial for understanding volcanic activity and predicting eruptions. By integrating four popular open-source tools (REDPy, EQcorrscan, HypoDD, and GrowClust) into a single workflow at volcano observatories, the completeness and accuracy of the catalogs can be improved. This workflow is beneficial for detailed volcano analyses in monitoring and research efforts.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Mariangela Sciotto, Andrea Cannata, Giuseppe Di Grazia, Placido Montalto
Summary: This study analyzed volcanic tremor and LP events recorded at Mt. Etna and concluded that they are not caused by a common source mechanism.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2022)
Article
Geochemistry & Geophysics
Kimiko Taguchi, Hiroyuki Kumagai, Yuta Maeda, Roberto Torres
Summary: Research suggests that long-period seismic events at active volcanoes may be caused by fluid-filled resonators oscillating. By using numerical simulations and empirical formulas, parameters such as crack geometry and fluid properties can be estimated, leading to the understanding that LP events may be triggered by explosive fragmentation of intruded magma.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Letter
Geosciences, Multidisciplinary
Zilin Song, Yen Joe Tan, Diana C. Roman
Summary: Volcano-tectonic earthquakes (VTs) and deep long-period earthquakes (DLPs) occur at Akutan Volcano in Alaska, and may provide insights into eruption forecasting. Through high-resolution earthquake detection and relocation analysis of seismic data from 2005 to 2017, it is found that VTs and DLPs are concentrated above and below the inferred magma reservoir, respectively. Both types of earthquakes occur in clusters during inflation episodes, but DLPs show a stronger correlation with inflation and their low-frequency content suggests a complex pathway directly related to magma movement. In contrast, repeating events are observed in VTs, indicating fault rupture triggered by magma/fluid movement or larger earthquakes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Roberto Torres, Hiroyuki Kumagai, Kimiko Taguchi
Summary: The study investigates the mechanism of LP seismic events at Galeras volcano in Colombia, revealing differences in characteristics between NLP and BLP events which are associated with parameters of magma cracks and gas emissions. The research suggests that the evolution of magma plug properties controls the occurrences of BLP and NLP events at the volcano.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Katherine R. Coppess, Eric M. Dunham, Martin Almquist
Summary: This study presents an alternative approach to calculate the moment tensor and force equivalents of eruptive processes. By modeling the conduit flow and chamber depressurization, we explain the equivalence of two seismic force descriptions and generate synthetic seismograms to examine the expression of eruptions at different receiver distances.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
M. Wimez, W. B. Frank
Summary: The study proposes a recursive matched-filter approach for detecting earthquake swarms. By selecting new template events for matched-filter search, the spatial coverage of the template set can be progressively extended. This method is suitable for systematically exploring earthquake swarms in both volcanic and tectonic contexts.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Zacharie Duputel, Valerie Ferrazzini, Cyril Journeau, Philippe Catherine, Philippe Kowalski, Aline Peltier
Summary: Changes in magma properties and transport geometry can directly impact volcanic activity, but tracking these variations during eruptions can be challenging. This study reports previously undetected very long-period (VLP) signals at Piton de la Fournaise volcano that can be used to monitor changes in magma transport. The analysis shows that VLP events during the 2015 eruption indicate a source depth of 0.9-1.2 km and point to the resonance of the magma dike feeding the eruption.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Wenke Sun, He Tang
Summary: This study presents the deformation Green's function for an expansion source in a spherical, non-rotating, viscoelastic, isotropic layered earth model using a semi-analytical method. The influence of stratification, curvature, and viscosity on deformation is analyzed, and the results are useful for explaining viscoelastic deformations caused by deep expansion sources in the layered viscoelastic earth model.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
David P. Sahara, Puput P. Rahsetyo, Andri Dian Nugraha, Devy Kamil Syahbana, Sri Widiyantoro, Zulfakriza Zulfakriza, Ardianto Ardianto, Aria W. Baskara, Shindy Rosalia, Martanto Martanto, Haunan Afif
Summary: This study analyzes pre-eruptive seismicity events for volcano eruption forecasting and identifies two types of seismic activity related to magma intrusion. By improving the accuracy of hypocenter locations, the study provides a better understanding of the subsurface structure of the volcano.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Matthew M. Haney, Helena Buurman, Stephen Holtkamp, Stephen R. McNutt
Summary: The study indicates that five distinctive long-period earthquakes observed before a months-long volcano-tectonic earthquake swarm at Little Sitkin volcano in 2012 were caused by the resonance of a tabular magma body at 15 km depth on the western side of the volcano. The magma body was estimated to have a lateral extent of 500 m and a thickness of 9 m. These earthquakes excited by a magmatic intrusion led to increased stress beneath the volcano, eventually triggering a shallow volcanic-tectonic earthquake swarm five days later.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Kathleen F. McKee, Diana C. Roman, Gregory P. Waite, David Fee
Summary: At Stromboli Volcano in Italy, the relationship between very long period (VLP) seismic signals and Strombolian eruptions has been thought to be caused by the unstable flow of gas slugs in the shallow plumbing system. However, a study using seismo-acoustic data from 2018 found that about 92% of VLP events did not coincide with impulsive infrasonic signals, suggesting a different mechanism. The study proposes that VLPs may be generated when gas bubbles move into a weak semi-solid plug in the upper portion of the conduit, leading to passive gas release and explosive escape mechanisms decoupled in time from VLPs.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
J. Villegas A. Raquel, Carniel Roberto, Ivan A. Petrinovic, Balbis Catalina
Summary: This work analyses seismic signals at the Irazu volcano and identifies 6 families of LP signals on the west slope of the volcano. It provides useful information for the evaluation of the volcanic hazard of the Irazu volcano.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Multidisciplinary Sciences
Gilda Currenti, Martina Allegra, Flavio Cannavo, Philippe Jousset, Michele Prestifilippo, Rosalba Napoli, Mariangela Sciotto, Giuseppe Di Grazia, Eugenio Privitera, Simone Palazzo, Charlotte Krawczyk
Summary: Analyzing low frequency volcanic signals at Vulcano Island, Italy, we observed dynamic strain records using Distributed Acoustic Sensing. Signs of unrest have been detected since September 2021, accompanied by CO2 degassing and long period events. Through investigating fiber optic cables, we found distinct frequency bands and characteristics in the low frequency signals.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Asdis Benediktsdottir, Olafur Gudmundsson, Ka Lok Li, Bryndis Brandsdottir
Summary: Volcanic eruptions in Iceland are often preceded by an increase in tremor levels, which vary in frequency and can be influenced by different factors. The source of the tremors may be shallow, less than about 1 km deep, and the pattern of wave energy radiated from the tremor source changes over time.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Frederic Cappa, Yves Guglielmi, Louis De Barros
Summary: This study investigates the mechanisms of permeability and friction evolution in a natural fault in situ. The authors conclude that the transient evolution of fault permeability and friction caused by a pressure perturbation exerts a potentially dominant control on fault stability during fluid flow.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Giuseppe Maggio, Senad Subasic, Christopher J. Bean
Summary: In this study, shallow geological features and previously unknown depths of main geological interfaces in the highly urbanized Dublin City area are investigated using complementary ambient noise seismic methods. The results indicate the presence of three consistent interfaces and suggest further research on deeper structures for potential geothermal studies.
GEOPHYSICAL PROSPECTING
(2022)
Article
Geosciences, Multidisciplinary
Frederic Cappa, Yves Guglielmi, Christophe Nussbaum, Louis De Barros, Jens Birkholzer
Summary: The decoupling of fault slip and opening drives rapid fluid pressurization and migration in low-permeability faults, with fault displacement occurring before the build-up of fluid pressure. Once fluid migration occurs due to slip-induced permeability increase, the fault experiences further opening.
Article
Geochemistry & Geophysics
Philippe Danre, Louis De Barros, Frederic Cappa
Summary: Many studies have found a correlation between seismic moment and injected fluid volume in fluid injection-induced earthquake sequences, but this correlation becomes uncertain when looking at individual events. In this study, the authors use the similarity between natural and injection-induced swarms to develop new methods for estimating fluid volume, shedding light on the fluid dynamics that trigger natural swarms.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Jiri Zahradnik, El Madani Aissaoui, Pascal Bernard, Pierre Briole, Simon Bufferal, Louis De Barros, Anne Deschamps, Panagiotis Elias, Christos P. Evangelidis, Ioannis Fountoulakis, Frantisek Gallovic, Vasilis Kapetanidis, George Kaviris, Olga-Joan Ktenidou, Sophie Lambotte, Olivier Lengline, Helene Lyon-Caen, Mark Noble, Vladimir Plicka, Alexis Rigo, Zafeiria Roumelioti, Anna Serpetsidaki, Efthimios Sokos, Nicholas Voulgaris
Summary: Researchers have observed a rare case of shallow rupture in the Corinth rift, where a moderate-to-large earthquake occurred at a relatively shallow depth. The earthquake ruptured two orthogonal fault segments, with the shallow moment release happening on a high-angle normal fault. This study provides valuable insights into earthquake hazards in rift environments.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
M. Rezaeifar, F. Lavoue, G. Maggio, Y. Xu, C. J. Bean, L. Pinzon-Rincon, S. Lebedev, F. Brenguier
Summary: Train-induced vibrations can be utilized as a powerful source for high-resolution subsurface imaging through seismic interferometry, as demonstrated in this study using three days of railroad traffic data recorded by a seismograph array in Dublin, Ireland. The results from our interferometry approaches show significant surface and body wave energy, consistent with nearby borehole data and an active seismic profile. These findings confirm the value of train-generated vibrations as a signal source for high-resolution subsurface imaging, while also highlighting the need for consideration of train geometry and the cross-correlation approach in body wave interferometry studies.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
L. Zuccarello, S. De Angelis, V Minio, G. Saccorotti, C. J. Bean, M. Paratore, J. M. Ibanez
Summary: This study presents observations from a seismic array deployment during the eruption of Mt. Etna in 2021. The results show different characteristics of eruption activity, with lava flows and ash plumes in the southeast sector, and mild degassing and effusion in the central and northeast summit craters. Changes in seismic array locations were found to consistently anticipate the onset of paroxysmal activity in the southeast sector.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Gareth Shane O'Brien, Christopher J. Bean, Hugo Meiland, Philipp Witte
Summary: Despite the limitations in current imaging technology, a deep learning approach called Fourier neural operator (FNO) is used to model and invert seismic signals in volcanic environments, improving our understanding of volcanic systems. The FNO is trained using simulations of elastic wave propagation through complex volcano models and can accurately reproduce seismic wavefields. It is also trained to predict complex velocity structures that are beyond the capabilities of current volcano imagery methods.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Caroline Chalumeau, Hans Agurto-Detzel, Louis De Barros, Philippe Charvis
Summary: By analyzing the source properties of 1514 aftershocks of the 2016 Pedernales earthquake in Ecuador, we are able to determine accurate seismic moments, stress drops, and P and S corner frequencies. We find that stress drops appear to increase with seismic moment and depend on their distance to the trench. The temporal evolution of source properties is examined through repeating earthquakes, revealing that variations within families are spatially variable, except near the trench where stress drops systematically decrease over time, indicating an increase in pore fluid pressure.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Louis De Barros, Yves Guglielmi, Frederic Cappa, Christophe Nussbaum, Jens Birkholzer
Summary: Fault slip induced by fluid perturbation in shale formations can impact the integrity of shale caprocks for reservoirs holding buoyant fluids, and a better understanding of these processes is critical for reservoir monitoring. In this study, seismic responses of a shale fault exposed to fluid pressurization during an injection experiment were analyzed. Two types of seismic signals were observed: tremors associated with fluid-induced slip propagation, and micro-earthquakes triggered by stress perturbations. Tremors serve as a more direct observation for fluid-induced slip, providing a useful tool for monitoring fluid leakage and sealing integrity.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Sergei Lebedev, James Grannell, Pierre Arroucau, Raffaele Bonadio, Nicola Piana Agostinetti, Christopher J. Bean
Summary: Ireland and Britain have similar tectonic history and are currently located far from active plate boundaries. However, the seismicity in these two areas shows surprising lateral variations, with Ireland experiencing very few earthquakes compared to the adjacent western Britain. Understanding the reasons behind these variations is crucial for understanding intraplate seismicity distributions and regional hazard assessment.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Gaurav Tomar, Srikumar Roy, Christopher J. Bean, Satish C. Singh, Brian 'Reilly, Nick Schofield
Summary: The Iceland Plume has had a significant impact on the North Atlantic region. A volcanic ridge system known as the Barra Volcanic Ridge System (BVRS) has been identified in the Rockall area, but its timing, morphology, extent, and emplacement mechanism are not well understood. Through seismic and magnetic analysis, it is suggested that the BVRS could be volcanoes of basaltic compositions, and the integration of gravity and seismic data indicates a thin crust beneath the BVRS. The volcanic intrusions in the BVRS possibly occurred after the Early Paleocene age, which coincides with the arrival of the Iceland mantle plume in the Rockall region.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Marion Baques, Louis De Barros, Maxime Godano, Clara Duverger, Herve Jomard
Summary: The Ubaye Region in the French Western Alps is one of the most seismically active regions in France, experiencing mainshock-aftershock sequences, seismic swarms, and complex sequences. In this study, a regional catalogue of existing focal mechanisms is compiled, and 100 new calculated focal mechanisms of aftershocks following a mainshock in 2014 are added. The results suggest that fluid pressure is a common triggering mechanism for the seismic activity in the region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Anna Serpetsidaki, Vasilis Kapetanidis, Panagiotis Elias, Alexis Rigo, Ioannis Spingos, Louis De Barros, Olivier Lengline, Simon Bufferal, Andreas Karakonstantis, Pascal Bernard, Pierre Briole, Jiri Zahradnik, George Kaviris, Vladimir Plicka, Efthimios Sokos, Nicholas Voulgaris
Summary: The seismic sequence in the Western Gulf of Corinth, Greece from 2020 to 2021 has been analyzed using seismological and geodetic data. The study reveals that the sequence involved seismic migration and triggering by pore-pressure diffusion due to fluid intrusion. The analysis of focal mechanisms and fault plane modeling provide insights into the faulting characteristics.
