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Publications (51)
Stress accumulation on the plate interface of subduction zones is a key parameter that controls the location, timing and rupture characteristics of earthquakes. The diversity of slip processes occurring in the megathrust indicates that stress is highly variable in space and time. Based on GNSS and InSAR data, we study the evolution of the interplat...
In February 2023, a long seismic sequence began in western Mexico City causing widespread panic and some damage to housing infrastructure. On May 11 and December 14, two Mw3.2 mainshocks occurred at less than 700 m depth. Unprecedented satellite interferograms captured tectonic deformations in the two epicentral zones during the days surrounding th...
Previous studies have suggested prominent variations in the seismic wave behavior at the 5 s period when traveling across the Valley of Mexico, associating them with the crustal structure and contributing to the anomalous seismic wave patterns observed each time an earthquake hits Mexico City. This article confirms the variations observed at 0.2 Hz...
Popocatépetl volcano is among Mexico’s most risky due to its proximity to populated areas. Since its reactivation in 1994, several geophysical studies have been performed to understand the eruptive history, volcanic activity, and associated hazards. Although several seismic studies were carried out using permanent and temporal seismic network recor...
An efficient Bayesian approach is proposed to infer fault slip from geodetic data in a Slow Slip Event (SSE). The physical model of the slip process reduces to a multiple linear regression with constraints. Assuming a Gaussian model for the geodetic data and considering a multivariate truncated normal prior distribution for the unknown fault slip,...
A 3D shear wave velocity model of the subsurface of Popocatépetl volcano was obtained using ambient noise tomography, employing the principal cross-terms of the empirical Green’s function. Daily cross-correlation waveforms were computed from the data recorded by four seismic broadband stations in 2012. Dispersion curves were estimated from the stac...
To shed light on the prevalently slow, aseismic slip interaction between tectonic plates, we developed a new static slip inversion strategy, the ELADIN (ELastostatic ADjoint INversion) method, that uses the adjoint elastostatic equations to compute the gradient of the cost function. ELADIN is a 2-step inversion algorithm to efficiently handle plaus...
Either the triggering of large earthquakes on a fault hosting aseismic slip or the triggering of slow slip events (SSE) by passing seismic waves involve seismological questions with important hazard implications. Just a few observations plausibly suggest that such interactions actually happen in nature. In this study we show that three recent devas...
Supplementary Movie: Evolution of aseismic slip rate (i.e., SSEs and coupling) at the plate interface across the states of Guerrero and Oaxaca, Mexico, during and beyond the devastating earthquake sequence. Dashed line areas depict large historical thrust earthquakes.
Understanding the interaction between tectonic plates from geodetic data is relevant to the assessment of seismic hazard. To shed light on that prevalently slow aseismic interaction, we developed a new static-slip inversion strategy, the ELADIN (ELastostatic ADjoint INversion) method, that uses the adjoint elastostatic equations to compute the grad...
The triggering of large earthquakes on a fault hosting aseismic slip or, conversely, the triggering of slow slip events (SSE) by passing seismic waves involves seismological questions with important hazard implications. Just a few observations plausibly suggest that such interactions actually happen in nature. In this study we show that three recen...
We propose an efficient Bayesian approach to infer a fault displacement from geodetic data in a slow slip event. Our physical model of the slip process reduces to a multiple linear regression subject to constraints. Assuming a Gaussian model for the geodetic data and considering a truncated multivariate normal prior distribution for the unknown fau...
Stress accumulation on the plate interface of subduction zones is a key parameter that controls the location, timing and rupture characteristics of earthquakes. The diversity of slip processes occurring in the megathrust indicates that stress is highly variable in space and time. Based on GPS and InSAR data, we study in depth the evolution of the i...
Triggering of large earthquakes on a fault that hosts aseismic slip or, conversely, triggering of slow slip events (SSE) by passing seismic waves involves seismological questions with major hazard implications. Just a few observations plausibly suggest that such interactions actually happen in nature. In this study we show that three recent devasta...
Understanding the fault behavior through geodetic data has an important impact in our assessment of the seismic hazard. To shed light on the aseismic evolution of a fault, we developed a new slip inversion strategy, the ELADIN (ELastostatic ADjoint INversion) method, that uses the adjoint elastostatic equations to efficiently compute the gradient o...
Plain Language Summary
Devastation in central Mexico produced by the intermediate‐depth (magnitude 7.1) Puebla‐Morelos earthquake of 19 September 2017 has raised important questions about the seismic hazard in Mexico City, where more than 20 million people live. Probabilistic hazard in the city from intermediate‐depth and shallower subduction event...
We present recent advances towards the simulation of realistic subduction scenario earthquakes in three dimensions (3D) along the Guerrero subduction zone by means of an hp-adaptive discontinuous Galerkin finite-element method (DGCrack, Tago et al., 2012). This method simulates the propagation of seismic waves generated by kinematic and dynamic rup...
How can we assess the uncertainties of a high-dimensional problem such as the ill-posed under-determined linear kinematic source inversion problem? In this presentation we focus on a specific strategy known as the Hamiltonian MCMC (HMCMC), which has shown very powerful results in other domains. There is still a lot of work to do. However, the preli...
We have applied instantaneous seismic attributes to a stacked P-wave reflected seismic section in the Tenerife field located in the Middle Magdalena Valley Basin in Colombia to estimate the volume of clay [Formula: see text] and the density [Formula: see text] at seismic scale. The well logs and the seismic attributes associated to the seismic trac...
We present recent advances towards the simulation of realistic subduction scenario earthquakes in three dimensions (3D) along the Guerrero subduction zone by means of an hp-adaptive discontinuous Galerkin finite-element method (DGCrack, Tago et al., 2012). This method simulates the propagation of seismic waves generated by kinematic and dynamic rup...
The historical record of large subduction earthquakes in Guer- rero, Mexico, reveals the existence of an ∼230 km length seg- ment below the coast where no major rupture has occurred in the past 60 years. Reliable quantification of the hazard associated with such a seismic gap is urgently needed for risk mitigation purposes by means of state-of-the-...
We describe a set of benchmark exercises that are designed to test if computer codes that simulate dynamic earthquake rupture are working as intended. These types of computer codes are often used to understand how earthquakes operate, and they produce simulation results that include earthquake size, amounts of fault slip, and the patterns of ground...
We describe a set of benchmark exercises that are designed to test if computer codes that simulate dynamic earthquake rupture are working as intended. These types of computer codes are often used to understand how earthquakes operate, and they produce simulation results that include earthquake size, amounts of fault slip, and the patterns of ground...
In the oil and gas industry, well test analysis using derivative plots, has been the core technique in examining reservoir and well behavior over the last three decades. Recently, diagnostics plots have gained recognition in the field of hydrogeology; however, this tool is still underused by groundwater professionals. The foremost drawback is that...
We present the results of the progressive kinematic source inversion applied to the 2016 Kumamoto (Mw7.0) mainshock.
Linear kinematic source inversion applied to the Source Inversion Validation exercise 1 (SIV1).
Built-up on top of ancient lake deposits, Mexico City experiences some of the largest seismic site effects worldwide. Besides the extreme amplification of seismic waves, duration of intense ground motion from large subduction earthquakes exceeds three minutes in the lake-bed zone of the basin, where hundreds of buildings collapsed or were seriously...
Finite-difference methods are popular for wave simulation within the seismic exploration community, thanks to their efficiency. However, difficulties arise when encountering complex topography due to the regular grid pattern of the finitedifference schemes. Despite alternatives that can handle the free surface with little effort, such as the spectr...
For considering elastic seismic wave propagation in large domains, efficient absorbing boundary conditions are required with numerical modelling in finite domains. Since their introduction by Bérenger, the perfectly matched layers (PML) has become the state-of-the art method because of its efficiency and ease of implementation. However, for anisotr...
We introduce a method for imaging the earthquake source dynamics from the inversion of ground-motion records based on a parallel genetic algorithm. The source model follows an elliptical patch approach and uses the staggered-grid split-node method to simulate the earthquake dynamics. A statistical analysis is used to estimate errors in both inverte...
We introduce a novel scheme, DGCrack, to simulate dynamic rupture of
earthquakes in three dimensions based on an hp-adaptive discontinuous
Galerkin method. We solve the velocity-stress weak formulation of
elastodynamic equations on an unstructured tetrahedral mesh with
arbitrary mesh refinements (h-adaptivity) and local approximation orders
(p-adap...
Reliable dynamic source models should account of both fault geometry and
heterogeneities in the surrounding medium. In this work we introduce a
novel numerical method for modeling the dynamic rupture based on a 3D
hp-Discontinuous Galerkin (DG) scheme. Our method is derived from the
scheme proposed by Benjemaa et al. (2009), which is based on a Fin...
Simulating any realistic seismic scenario requires incorporating
physical basis into the model. Considering both the dynamics of the
rupture process and the anelastic attenuation of seismic waves is
essential to this purpose and, therefore, we choose to extend the
hp-adaptive Discontinuous Galerkin finite-element method to integrate
these physical...
A quadratic programming formulation for multiclass image segmentation is investigated. It is proved that, in the convex case, the non-negativity constraint on the recent reported quadratic Markov measure field model can be neglected and the solution preserves the probability measure property. This allows one to design efficient optimization algorit...