Search for earthquake (400 results)

Revisiting the 2015 Mw=8.3 Illapel earthquake: Unveiling complex fault slip properties using Bayesian inversion.

Emmanuel Caballero, Zacharie Duputel, Cedric Twardzik, et al.

Published: 2023-10-02
Subjects: Physical Sciences and Mathematics

The 2015 moment magnitude Mw=8.3 Illapel earthquake is the largest mega-thrust earthquake that has been recorded along the Chilean subduction zone since the 2010 M_W=8.8 Maule earthquake. Previous studies indicate a rupture propagation from the hypocenter to shallower parts of the fault, with a maximum slip varying from 10 to 16 meters. The amount of shallow slip differs dramatically between [...]

Lower-Crustal Normal Faulting and Lithosphere Rheology in the Atlas Foreland

Sam Wimpenny, Timothy J Craig, Alice Blackwell

Published: 2023-10-02
Subjects: Physical Sciences and Mathematics

Earthquakes beneath the foreland basins of the Andes and Tibet follow a simple pattern, with normal-faulting events from 0--20 km depth and reverse-faulting events from 30--50 km depth. The switch in faulting style with depth suggests that the elastic stresses generated by flexure within these forelands are large enough to break faults, with opposite senses of horizontal strain either side of a [...]

The Holocene to Modern Fraser River Delta, Canada: Geological History, Processes, Deposits, and Natural Hazards

Andrew La Croix, Shahin Dashtgard, Korhan Ayranci, et al.

Published: 2023-10-01
Subjects: Physical Sciences and Mathematics

The Fraser River Delta (FRD) is a major sedimentary system and is home to one of Canada’s largest metropolitan areas, Metro Vancouver. It is also an ecologically important region that is culturally significant to several First Nations groups. In this review, we summarize the state of knowledge about the geological evolution of the FRD and link hydrodynamic processes with sedimentary products [...]

A Cascadia Slab Model from Receiver Functions

Wasja Bloch, Michael G. Bostock, Pascal Audet

Published: 2023-09-08
Subjects: Earth Sciences, Geophysics and Seismology

We map the characteristic signature of the subducting Juan de Fuca and Gorda plates along the entire Cascadia forearc from northern Vancouver Island, Canada to Cape Mendocino in northern California, USA, using teleseismic receiver functions. The subducting oceanic crustal complex, possibly including subcreted material, is parameterized by three horizons capable of generating mode-converted waves: [...]

Garnet fracturing reveals ancient unstable slip events hosted in plate interface metasediments

Samuel Angiboust, P. Io Ioannidi, Iskander Muldashev

Published: 2023-09-01
Subjects: Physical Sciences and Mathematics

A paradox exists between the great number of intermediate-depth earthquakes occurring along active subduction interfaces worldwide and the extreme scarcity of paleo-seismic events recorded in exhumed metasedimentary rocks from ancient subduction zones. Recrystallization, shearing as well as exhumation-related overprinting generally contribute to the nearly-complete erasing of markers of unstable [...]

Forecast of Earthquake Magnitude for North-West (NW) Indian Region Using Machine Learning Techniques

Aditya Gupta, Babita Sharma, Prasanta Chingtham

Published: 2023-08-24
Subjects: Geophysics and Seismology

Earthquakes have posed significant hazards to human lives and infrastructure for as far back as can be recalled. This paper presents a Machine Learning (ML) based approach for earthquake magnitude forecasting spatially using the earthquake clustering in five selected zones of NW Indian region. Previous research efforts have primarily relied on empirical relationships and statistical models, which [...]

A proxy implementation of thermal pressurization for earthquake cycle modeling on rate-and-state faults

Marco Tulio Herrera Mena, Jean Paul Ampuero, Jorge G.F. Crempien

Published: 2023-08-22
Subjects: Physical Sciences and Mathematics

The reduction of effective normal stress during earthquake slip due to thermal pressurization of fault pore fluids is a significant fault weakening mechanism. Explicit incorporation of this process into frictional fault models involves solving the diffusion equations for fluid pressure and temperature outside the fault at each time step, which significantly increases the computational complexity. [...]

An Overview of Seismic Activities in Ghana: A Systematic Review

Baah Asare-Bediako, Cyril Dziedzorm Boateng, Sylvester Kojo Danuor, et al.

Published: 2023-08-08
Subjects: Education, Physical Sciences and Mathematics

Seismic activities pose significant challenges to societies globally. Therefore, it is crucial to understand their occurrence, patterns, and impacts. By studying seismic activities, including earthquakes, researchers can investigate their occurrence, distribution, and characteristics which can provide effective management and risk reduction strategies. The southern part of Ghana is prone to [...]

An adjoint-based optimization method for jointly inverting heterogeneous material properties and fault slip from earthquake surface deformation data

Simone Puel, Thorsten W. Becker, Umberto Villa, et al.

Published: 2023-07-19
Subjects: Physical Sciences and Mathematics

Analysis of tectonic and earthquake-cycle associated deformation of the crust can provide valuable insights into the underlying deformation processes including fault slip. How those processes are expressed at the surface depends on the lateral and depth variations of rock properties. The effect of such variations is often tested by forward models based on a priori geological or geophysical [...]

Automated shear-wave splitting analysis for single- and multi- layer anisotropic media

Thomas Samuel Hudson, Joseph Asplet, Andrew Walker

Published: 2023-06-07
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Shear-wave velocity anisotropy is present throughout the earth. The strength and orientation of anisotropy can be observed by shear-wave splitting (birefringence) accumulated between earthquake sources and receivers. Seismic deployments are getting ever larger, increasing the number of earthquakes detected and the number of source-receiver pairs. Here, we present a new software package, SWSPy, [...]

A diffuse interface method for earthquake rupture dynamics based on a phase-field model

Jorge Nicolas Hayek, Dave A May, Casper Pranger, et al.

Published: 2023-06-01
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

In traditional modeling approaches, earthquakes are often depicted as displacement discontinuities across zero-thickness surfaces embedded within a linear elastodynamic continuum. This simplification, however, overlooks the intricate nature of natural fault zones and may fail to capture key physical phenomena integral to fault processes. Here, we propose a diffuse interface description for [...]

The Impact of the Three-Dimensional Structure of a Subduction Zone on Time-dependent Crustal Deformation Measured by HR-GNSS

Oluwaseun Idowu Fadugba, Valerie Sahakian, Diego Melgar, et al.

Published: 2023-06-01
Subjects: Physical Sciences and Mathematics

Accurately modeling time-dependent coseismic crustal deformation as observed on high-rate Global Navigation Satellite System (HR-GNSS) lends insight into earthquake source processes and improves local earthquake and tsunami early warning algorithms. Currently, time-dependent crustal deformation modeling relies most frequently on simplified 1D radially symmetric Earth models. However, for shallow [...]

Linking 3D long-term slow-slip cycle models with rupture dynamics: the nucleation of the 2014 Mw 7.3 Guerrero, Mexico earthquake

Duo Li, Alice-Agnes Gabriel

Published: 2023-05-25
Subjects: Geophysics and Seismology

Slow slip events (SSEs) have been observed in spatial and temporal proximity to megathrust earthquakes in various subduction zones, including the 2014 $M_\mathrm{w}$7.3 Guerrero, Mexico earthquake which was preceded by a $M_\mathrm{w}$ 7.6 SSE. However, the underlying physics connecting SSEs to earthquakes remains elusive. Here, we link 3D slow-slip cycle models with dynamic rupture simulations [...]

Solving a seismic mystery with a diver’s camera: A case of shallow water T -waves in the Persian Gulf

Amir Salaree, Zack J. Spica, Yihe Huang

Published: 2023-05-14
Subjects: Earth Sciences

Sparse offshore coverage of seismic networks has hindered detailed studies of submarine earthquakes and their associated seismic hazard. We present results of our analysis of a diver’s recording of acoustic signals from an ML=5.6 earthquake in the Persian Gulf. We model the signals as a set of several shallow water T phases the frequency and group velocity of which are determined by bathymetry. [...]

Do slow slip earthquakes inhibit catastrophes? Geologic evidence from the Guerrero segment, Mexican subduction zone

Maria Teresa Ramirez Herrera, Jan Cerny, Nestor Corona, et al.

Published: 2023-05-12
Subjects: Physical Sciences and Mathematics

Globally, the largest tsunamigenic earthquakes have occurred along subduction zones. The Mw>9 devasting events in Chile, Sumatra, and Japan struck in areas where no instrumental records reported similar events. The one-thousand kilometer-long Mexican subduction zone (MSZ), where the Rivera-Cocos plates subduct under the North American plate, has no records of events of such magnitude. Historical [...]


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