Development of near-surface dilatancy zones as a possible cause for seismic emission anomalies before strong earthquakes

Салтыков, В. А.; Kugaenko, Yu. A.

doi:10.1134/s1819714012010113

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Let the fault surface Σ be explicitly given by the equation ξ 2 = f (ξ 1 , ξ 3 ). In this case, the unit normal n at each point ξ(ξ 1 , ξ 2 , ξ 3 ) of the surface can be found as follows: We denote integrand (8) by Ω strike (ξ 1 , ξ 2 , ξ 3 ):…”

Section: Distributed Sourcementioning

confidence: 99%

“…Figure 15 shows the displacement field caused by the hypothetical earthquake. Such differences from the classical case can be useful for providing an explanation as to why in some cases the simulation results differ from the results of observations, for example, when analyzing seismic emission [8] or the estimation of the parameters of an imminent seismic event source [30].…”

Section: Computational Experiments Nomentioning

confidence: 99%

“…In addition to the geometry of this surface, the earthquake source is characterized by its orientation and position in space, as well as by the field of the slip vector along the rupture surface. When describing the source, the following assumptions are most often used: the surface geometry is simplified to a flat rectangular area [4][5][6], and the displacement vector is assumed to be constant [7,8]. Such simplifications make it possible to obtain analytical solutions to the problem of determining the displacement field of the Earth's crust at the time of an earthquake [9].…”

Section: Introductionmentioning

confidence: 99%

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Stochastic Strike-Slip Fault as Earthquake Source Model

Gapeev,

Solodchuk,

Parovik

2023

Mathematics

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It is known that the source of a tectonic earthquake in the framework of the theory of elasticity and viscoelasticity is considered to be displacement along a certain fault surface. Usually, when describing a source, the geometry of the fault surface is simplified to a flat rectangular area. The displacement vector is assumed to be constant. In this paper, we propose a model of an earthquake source in the form of a displacement with a constant vector along a stochastic uneven surface. A number of standard assumptions are made during the modeling. We take into account only the elastic properties of the medium. We consider the Earth’s crust as a half-space and assume that the medium is homogeneous and isotropic. For the mathematical description of the earthquake source, we use the classical force equivalent of displacement along the fault. This is the distribution of double pairs of forces. The field of displacements under the action of body forces is found through a combination of Mindlin nuclei of strain. The paper presents numerical analytic solutions for displacement along the strike-slip fault corresponding to one of an earthquake source mechanism. We propose to introduce a random deformation of a rectangular flat fault surface. The paper shows the results of a computational experiment comparing the levels and regions of relative deformations of the Earth’s crust in the case of displacement along a flat fault surface and along a stochastic uneven one. In the case of a stochastic fault surface, the regions of relative deformations become asymmetric. Such differences from the classical case can be useful for an explanation as to why in some cases the simulation results differ from the results of observations.

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Section: Distributed Sourcementioning

confidence: 99%

Section: Computational Experiments Nomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stochastic Strike-Slip Fault as Earthquake Source Model

Gapeev,

Solodchuk,

Parovik

2023

Mathematics

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“…The aim is a monitoring of geophysical variations of seismic and volcano's activity and its influence on geophysical processes. The main impact on geophysical fields is a stress-strain state of the earth's crust [1][2][3][4]. In this paper we analyze Sentinel-1A satellite SAR data in order to compare modeling results with InSAR data.…”

Section: Introductionmentioning

confidence: 99%

InSAR data analysis at Kamchatka during 2016

Larionov

Perezhogin

2017

E3S Web Conf.

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Geophysical monitoring in seismically active areas depends on geodeformation processes in the earth's crust. Observations of earth's crust strain-stress using gps-measurements, laser interferometers give only an opportunity to analyze the dynamics in time without the possibility of extrapolation to adjacent areas. In this regard, it is useful to apply a radar interferometry technology to measure the displacements of the earth's surface. The report includes the results of processing the radar data of the Sentinel-1A satellite. Several qualitative interferometric pairs were obtained during the period from June to October 2016. A high coherence coefficient is observed in open areas in the vicinity of volcanic structures and adjacent territories, as well as on the west coast of Kamchatka, where there is no high vegetation. The main factor that significantly reduces the coherence of images is the forest cover. Possibility of estimating the surface displacement at regions with a high coherence coefficient is discussed.

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