Preprints
Filtering by Subject: Geophysics and Seismology
Application of machine learning methods to forecast petrophysical properties in basalts of the Serra Geral Group: Implications for carbon storage
Published: 2024-10-22
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Earth Sciences, Environmental Sciences, Geophysics and Seismology, Oil, Gas, and Energy, Physical Sciences and Mathematics
This study applies machine learning techniques for forecasting petrophysical properties (density, porosity, and permeability) in the basalts of the Serra Geral Group, located in the Paraná Basin, Brazil. These properties are crucial for the successful implementation of carbon capture and storage (CCS), an important technology to combat climate change. Employing machine learning models—XGBoost, [...]
Synthetic Tests on Resolvability of Space-Time Rupture History With Isola
Published: 2024-10-15
Subjects: Geophysics and Seismology
This study evaluates the limitations of the ISOLA software in estimating rupture velocity by using synthetic tests that mimic the 2023 Turkish Mw 7.8 earthquake. Two types of slip-distribution models, point-like and continuous, were used as input for synthetic seismogram generation, which were then inverted using ISOLA multiple-point-source (MPS) approach. Key parameters affecting the software [...]
The ANTICS Large-N Seismic Deployment in Albania
Published: 2024-10-15
Subjects: Geophysics and Seismology
Located within the active continental collision between Eurasia and the Adriatic microplate, Albania is an earthquake prone country with one of the highest seismic hazard in Europe. This came into evidence when the Mw=6.4 Durrës earthquake hit the country in 2019, causing 51 fatalities and widespread damage to infrastructure. Despite this stark reminder, the seismotectonics of Albania remains [...]
Unlocking DAS amplitude information through coherency coupling quantification
Published: 2024-10-11
Subjects: Earth Sciences, Geophysics and Seismology, Geotechnical Engineering
Distributed Acoustic Sensing (DAS) allows one to measure strain at metre-resolution along a fibreoptic cable, increasing spatial sampling of a seismic wavefield compared to conventional instrumentation. However, the challenge of measuring DAS-derived strain amplitude currently limits applications of this technology. Absolute amplitude measurements are required for estimating earthquake [...]
Interseismic deformation fingerprints on the hyperarid coastal landscape in North Chilean subduction
Published: 2024-10-10
Subjects: Earth Sciences, Geology, Geomorphology, Geophysics and Seismology, Tectonics and Structure
Along-strike seismotectonic behavior of subduction megathrusts feeds back into the forearc deformation as elastic and permanent deformation. However, whether and how short-term elastic deformation reflects long-term permanent deformation in the forearc and shapes the coastal region remains unclear. To evaluate the forearc deformation, we analyze the interseismic surface deformation obtained from [...]
Slip-Tremor Interaction at the Very Beginning of Episodic Tremor and Slip in Cascadia
Published: 2024-10-10
Subjects: Geophysics and Seismology
In Cascadia, the concomitance of slow slip events (SSE) and tremors during Episodic Tremor and Slip (ETS) episodes is well documented. Brittle tremor patches embedded in the ductile background deforming aseismically is the most common sketch for the fault structure, but whether tremor patches impact the SSE process is under debate. This study focuses on the initiation stage of major Cascadia [...]
Coseismic slip and early afterslip of the 2024 Hyuganada earthquake modulated by a subducted seamount
Published: 2024-10-04
Subjects: Geophysics and Seismology
Subducted rough topography complicates seismic and aseismic slip behavior. The 2024 M 7.1 Hyuganada earthquake occurred along the megathrust with ridge subduction. We inferred coseismic slip and afterslip using geodetic displacements to observationally illustrate the role of subducted seamounts in modulating seismic and aseismic slip processes. The inferred mainshock slip was confined in the [...]
Integration of Deterministic Seismic inversion with Machine Learning for Reservoir Characterization
Published: 2024-10-04
Subjects: Geology, Geophysics and Seismology, Stratigraphy
Seismic inversion plays a key role in reservoir characterization. The inversion allows interpreters to transfer data from interface properties to layers and physical properties. Various deterministic approaches are available for interpreters to achieve this objective, including model-based, trace-based, recursive approaches, etc. Machine learning methods are increasingly adopted in reservoir [...]
Seismic Characterization of Carbonate Stringers using Machine Learning techniques: an example from the Western Flank of South Oman Salt Basin
Published: 2024-10-03
Subjects: Geology, Geophysics and Seismology, Sedimentology
Carbonate stringers are defined as a slab of carbonate bodies encased inside salt. In Oman, the intra-salt carbonate stringers are a very common target, especially in South Oman Salt Basin (SOSB). These stringers contain a large amount of hydrocarbon resources. In this study, the behavior of carbonate stringer bodies hosted in Ara salt structures from the SOSB is investigated. Both synthetic and [...]
3D wave propagation and earthquake dynamic rupture simulations in complex poroelastic media
Published: 2024-09-26
Subjects: Geophysics and Seismology
Numerical simulations of earthquakes and seismic wave propagation require accurate material models of the solid Earth. In contrast to purely elastic rheology, poroelasticity accounts for pore fluid pressure and fluid flow in porous media. Poroelastic effects can alter both the seismic wave field and the dynamic rupture characteristics of earthquakes. For example, the presence of fluids may affect [...]
High-resolution geophysical monitoring of moisture accumulation preceding slope movement – a path to improved early warning
Published: 2024-09-25
Subjects: Environmental Monitoring, Geomorphology, Geophysics and Seismology, Hydrology
Slope failures are an ongoing global threat leading to significant numbers of fatalities and infrastructure damage. Landslide impact on communities can be reduced using efficient early warning systems to plan mitigation measures and protect elements at risk. This manuscript presents an innovative geophysical approach to monitoring landslide dynamics, which combines Electrical Resistivity [...]
A new expression for fluid factor using AVO intercept and gradient: theory and application on deep marine reservoir
Published: 2024-09-18
Subjects: Geology, Geophysics and Seismology, Oil, Gas, and Energy
Numerous AVO fluid indicators have been introduced and proven to be sensitive to hydrocarbon presence. Mathematically, fluid indicators measure the deviation of seismic responses of hydrocarbon-saturated reservoirs from their background in a specific domain. We introduce a new expression for the fluid factor commonly used in AVO analysis and interpretation. The expression is a function of common [...]
Evidence supporting a broader than previously thought influence of solar activity over Earth system’s processes. Discussion of a possible mechanism.
Published: 2024-09-08
Subjects: Atmospheric Sciences, Earth Sciences, Geochemistry, Geology, Geophysics and Seismology, Meteorology, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Tectonics and Structure, Volcanology
In this article, I show lines of evidence supporting a modulation of volcanic activity and some weather phenomena by solar wind conditions in the near-Earth environment. On a daily timescale, a correlation is found between the LP earthquake activity of Kilauea volcano, related to magma transport, and the Bx component of the interplanetary magnetic field as measured in the OMNI database for [...]
The formation and evolution of Earth’s inner core.
Published: 2024-09-03
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
Growth of the inner core provides crucial power for generating the geomagnetic field and preserves a unique record of deep Earth evolution. The classical picture of inner core growth ignores the fact that the liquid core must have been supercooled below its melting temperature to spontaneously freeze the inner core. In this review we assess the impact of supercooling on inner core formation, [...]
Distinguishing natural sources from anthropogenic noise in seismic data
Published: 2024-08-30
Subjects: Earth Sciences, Geophysics and Seismology