Numerical modelling of seismic waves from earthquakes recorded by a network on ice floes

Serdyukov, A. S.; Koulakov, Ivan; Yablokov, A. V.

doi:10.1093/gji/ggz148

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…For most of the local earthquakes, we were able to identify the P -waves and frequently, the SP-waves (i.e., S -waves converted to P -waves on the sea bottom), which facilitated high-accuracy determinations of the earthquake locations. The presence of sufficiently strong converted SP-waves generated by local earthquakes was previously shown by numerical modeling 21 . An example of picking a local event, which demonstrates fairly clear SP wave arrivals, is presented in Fig.…”

Section: Resultsmentioning

confidence: 53%

Low-degree mantle melting controls the deep seismicity and explosive volcanism of the Gakkel Ridge

et al. 2022

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The world’s strongest known spreading-related seismicity swarm occurred in 1999 in a segment of the Gakkel Ridge located at 85°E as a consequence of an effusive-explosive submarine volcanic eruption. The data of a seismic network deployed on ice floes were used to locate hundreds of local earthquakes down to ∼25 km depth and to build a seismic tomography model under the volcanic area. Here we show the seismicity and the distribution of seismic velocities together with the 3D magmatic-thermomechanical numerical model, which demonstrate how a magma reservoir under the Gakkel Ridge may form, rise and trigger volcanic eruptions in the rift valley. The ultraslow spreading rates with low mantle potential temperatures appear to be a critical factor in the production of volatile-rich, low-degree mantle melts that are focused toward the magma reservoirs within narrow magmatic sections. The degassing of these melts is the main cause of the explosive submarine eruptions.

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Section: Resultsmentioning

confidence: 53%

Low-degree mantle melting controls the deep seismicity and explosive volcanism of the Gakkel Ridge

et al. 2022

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“…Using the velocity-stress approach, recent works were developed by Serdyukov, Koulakov and Yablokov [20] and Wang, Peng, Lu and Cui [47]. In the first one, they modelled seismic waves from recorded earthquakes.…”

Section: Discussionmentioning

confidence: 99%

“…where we have taken the first time derivatives of expressions ( 18)- (20). Finally, for a complete description of seismic wave propagation, the information about the internal forces and deformations in the material are needed [3].…”

Section: Wave Propagationmentioning

confidence: 99%

“…In particular, he employed a Gaussian pulse as an explosive source by adding a value to the stress terms. Other sources, like the derivative of a Gaussian pulse and Ricker wavelets of different frequencies, have been implemented also by Virieux [17] and other authors [18][19][20]. Concerning to the implementation of external boundary conditions, one problem everyone has to face is associated with the reflection of waves within the numerical domain.…”

Section: Introductionmentioning

confidence: 99%

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First steps on modelling wave propagation in isotropic-heterogeneous media: numerical simulation of P–SV waves

Landinez¹,

Rueda²,

Lora-Clavijo³

2021

Eur. J. Phys.

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In geophysics, wave propagation in elastic media is a crucial subject. In this context, seismology has made significant progress as a result of numerous advances, among these stands out the advancement of numerical methods such as the finite-difference one. Usually, seismic wave propagation in elastic media results in complex systems of partial differential equations, whose solutions cannot be obtained in an analytical way, especially when dealing with heterogeneous media. In consequence, there exists a necessity to implement numerical methods. However, the available information about the construction of a numerical solution of these equations is not as explicit as it should be. Our main goal is to provide pedagogical instructions for undergraduate students who want to improve their computational skills as well as their knowledge of the subject. The last through current teaching methods involving challenging problems and transversal tools. Particularly, we provide a brief description of the equations and a detailed description of the numerical solution of the seismic wave equation. Furthermore, we model two different seismic explosive sources in both homogeneous and heterogeneous media as an illustrative example. In the results, we include velocity maps showing wave propagation in the x–z plane, and the z-velocity as a function of time measured in a series of detectors distributed in the numerical domain.

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“…In this regard, a convenient approach for describing wave processes in an Arctic waveguide is the methods of acoustics of layered media [17]. In contrast to known approaches, where waves penetrating the entire volume of the medium are used for local measurements, such as waves from earthquakes [18], the present study considers normal waves-propagating along medium layers. Their main property is velocity dispersion.…”

Section: Theoretical Foundationsmentioning

confidence: 99%

Arctic-Type Seismoacoustic Waveguide: Theoretical Foundations and Experimental Results

Sobisevich,

Presnov,

Shurup

2024

JMSE

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The results of theoretical analysis and practical implementation of seismoacoustic methods developed for monitoring ice-covered regions in the Arctic are presented and discussed. Special attention is paid to passive seismoacoustic tomography as a unique method of studying the deep structure of the lithosphere and hydrosphere without the use of powerful sources. One of the distinctive features of the considered approach is the use of receivers located on the ice surface to recover characteristics of Arctic-type seismoacoustic waveguide “lithosphere-hydrosphere-ice cover”. In passive monitoring, special attention is paid to reducing the noise signal accumulation time required to obtain seismoacoustic wave propagation times, as well as expanding the analyzed frequency bandwidth. The presented results can be used to develop technologies for seasonal and long-term monitoring of the currently observed variability of large areas of the Arctic region due to climatic changes.

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Numerical modelling of seismic waves from earthquakes recorded by a network on ice floes

Cited by 7 publications

References 23 publications

Low-degree mantle melting controls the deep seismicity and explosive volcanism of the Gakkel Ridge

Low-degree mantle melting controls the deep seismicity and explosive volcanism of the Gakkel Ridge

First steps on modelling wave propagation in isotropic-heterogeneous media: numerical simulation of P–SV waves

Arctic-Type Seismoacoustic Waveguide: Theoretical Foundations and Experimental Results

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