Short‐Lived and Voluminous Fluid‐Flow in a Single Fracture Related to Seismic Events in the Middle Crust

Mindaleva, Diana; Uno, Masaoki; Tsuchiya, Noriyoshi

doi:10.1029/2022gl099892

Cited by 4 publications

(2 citation statements)

References 80 publications

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“…Fractures are intrinsically planes of weakness; slight perturbations in stress can displace the fractures, opening or closing the voids, thus affecting flow and transport. Radioactive gases like Xenon, induced by nuclear blast tests, can seep through fractures to the atmosphere anywhere from within minutes to months [10]. The fracturing enhances the permeability, providing additional fluid transport [11][12][13][14].…”

Section: Introduction mentioning

confidence: 99%

Monte Carlo Methods to Simulate the Propagation of the Created Atomic/ Nuclear Particles from Underground Piezoelectric Rocks through the Fractures Before the Earthquakes

Bahari,

Mohammadi,

Shakib

et al. 2024

Atom Indo.

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Until now, many studies have been performed on particle radiations before or during earthquakes (EQs). Neutron, gamma, electron, proton, and ultra-low frequency (ULF) photons are among the particles, detected during EQs. In our previous study, with the help of piezoelectricity relationships and the elastic energy formula, the Monte Carlo N‐Particle eXtended (MCNPX) simulation code was applied to find the amount of created atomic/nuclear particles, the dominant interactions; and the energy of the particles for various sizes of quartz and granite blocks. In this study, using the MCNPX simulation code, we have estimated the flux of the particles (created from under-stressed granitic rocks) at different distances from the EQ hypocenter inside the fractures, filled with air, water, and CO2. It was found that inside a water-filled fracture, the particles do not show the flux far from the EQ hypocenter. However, inside the gases like air and CO2 with the normal condition density, different types of particles can have a flux far from the source (more than a kilometer) and they might reach themselves to the surface in the case that the EQ hypocenter is very shallow (0-5 km). However, for deep EQs, it seems that the most detected nuclear particles on the surface should pass via the vacuum-filled fractures and reach the surface. Moreover, it was concluded that the higher the density of the fracture’s filling fluid, the less distance that the particles can have a flux.

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Section: Introduction mentioning

confidence: 99%

Monte Carlo Methods to Simulate the Propagation of the Created Atomic/ Nuclear Particles from Underground Piezoelectric Rocks through the Fractures Before the Earthquakes

Bahari,

Mohammadi,

Shakib

et al. 2024

Atom Indo.

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“…Additionally, many geophysical observations suggest large variations of pore pressure on the timescale of the slow-earthquake cycle (e.g., Gosselin et al, 2020;Tanaka et al, 2018;Warren-Smith et al, 2019). The rapid pore-pressure variations have been also evidenced based on field studies of exhumed rocks (e.g., Angiboust et al, 2014Angiboust et al, , 2015Behr & Bürgmann, 2021;Mindaleva et al, 2023;Saffer & Tobin, 2011;Taetz et al, 2018). Therefore, some models of the slow earthquakes and tremors take into account of the impact of fluid pressure on the fault coupling and on generation of seismic waves (e.g., Bernaudin & Gueydan, 2018;Cruz-Atienza et al, 2018;Farge et al, 2021;Shapiro et al, 2018;Zhu et al, 2020).…”

mentioning

confidence: 98%

Comparison of Continuously Recorded Seismic Wavefields in Tectonic and Volcanic Environments Based on the Network Covariance Matrix

Barajas,

Journeau,

Obara

et al. 2023

JGR Solid Earth

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Extended and sufficiently dense seismic networks capture spatiotemporal properties of the continuously recorded wavefields and can be used to compute the level of their coherence at different frequencies via the analysis of the network covariance matrix, which has been successfully used to study volcanic seismicity. Here, we present an application of the covariance matrix method in a subduction zone environment. We show that most coherent signals identified through the covariance matrix analysis are related to regional earthquakes with the wavefield properties affected by the scattering, which depends on the source location. Tectonic tremors, on the other hand, are not characterized by a high level of coherence. We compare real data results with a set of synthetic tests aimed at mimicking the properties of seismic sources and the main features of wave propagation. We conclude that highly coherent volcanic tremor wavefields could be produced in two ways: by a spatially localized group of monochromatic seismic sources or by a single source located in a highly heterogeneous medium. In both cases, the stability of the source position is a necessary condition to reproduce the observations in volcanoes. On the other hand, the low coherence of tectonic tremor wavefields can be explained by a spatially extended distribution of sources, in agreement with large portions of the subduction interface being nearly simultaneously involved in the episodes of slow deformation.

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Metasomatism at a metapelite–ultramafic rock contact at the subduction interface: Insights into mass transfer and fluid flow at the mantle wedge corner

Oyanagi

Uno

Okamoto

2023

Contrib Mineral Petrol

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Short‐Lived and Voluminous Fluid‐Flow in a Single Fracture Related to Seismic Events in the Middle Crust

Abstract: Fluid flow in the crust induces hydration reactions and contributes to earthquake triggering (F.

Cited by 4 publications

References 80 publications

Monte Carlo Methods to Simulate the Propagation of the Created Atomic/ Nuclear Particles from Underground Piezoelectric Rocks through the Fractures Before the Earthquakes

Monte Carlo Methods to Simulate the Propagation of the Created Atomic/ Nuclear Particles from Underground Piezoelectric Rocks through the Fractures Before the Earthquakes

Comparison of Continuously Recorded Seismic Wavefields in Tectonic and Volcanic Environments Based on the Network Covariance Matrix

Metasomatism at a metapelite–ultramafic rock contact at the subduction interface: Insights into mass transfer and fluid flow at the mantle wedge corner

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