Rafael Abreu

The Virtual Receiver Approach: Probing the Internal Structure of Large Low-Seismic-Velocity Provinces

Chahana Nagesh, Rafael Abreu, Mariano S. Arnaiz-Rodríguez

Understanding the internal structure of the Large Low-Seismic-Velocity Provinces (LLSVPs) is crucial for deciphering the convection system of the lower mantle. However, the exact origin, nature, and composition of the LLSVPs remain a subject of ongoing debate. Existing techniques, such as seismic …

fr, ve (code pays fourni par la source)

The Complex-Step Integral Transform

Rafael Abreu, S. Durand, Jochen Kamm, Christine Thomas et autres

Building on the well-established connection between the Hilbert transform and derivative operators, and motivated by recent developments in complex-step differentiation, we introduce the Complex-Step Integral Transform (CSIT): a generalized integral transform that combines analytic continuation, derivative approximation, and multi-scale smoothing within a …

Micropolar Modeling of Shear Wave Dispersion in Marine Sediments and Deep Earth Materials: Deriving Scaling Laws

Rafael Abreu

We draw connections between eight different theories used to describe microscopic (atomic) and macroscopic (seismological) scales. In particular, we show that all these different theories belong to a particular case of a single partial differential equation, allowing us to gain new physical …

fr (code pays fourni par la source)

Comprehensive monitoring of the subglacial stream of Glacier d'Otemma using seismic nodes and distributed acoustic sensing data

Eva Wolf, Eleonore Stutzmann, Jean‐Philippe Métaxian, Ugo Nanni et autres

Subglacial processes are difficult to monitor due to their inaccessibility with conventional hydrological probes. We know relatively little about when and at what rate the products of subglacial erosion are evacuated, especially for coarse sediment (bedload). Environmental seismology is contributing to close …

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Evidence of High-Shear-Velocity Anomalies Inside the Pacific LLSVP

Rafael Abreu, Mariano S. Arnaiz-Rodríguez, Chahana Nagesh

We present the evidence of high-velocity regions within the Pacific Large Low Seismic Velocity Province (LLSVP), uncovered using the Virtual Receiver Approach (VRA), a novel seismic imaging method that allows us to determine local absolute velocity values of a non-reflecting body wave …

fr (code pays fourni par la source)

A virada cristã Algumas considerações sobre a influência da doutrina d’O Caminho no pensamento de Santo Agostinho

Rafael Abreu

Resumo Talvez, este trabalho seja sobre o óbvio. Buscar alguns elementos do pensamento agostiniano no evangelho também não é nem um pouco original. Entretanto, ao tentarmos nos afastar da clássica definição da tradição do pensamento filosófico que localiza Agostinho entre Platão e …

Crustal and upper mantle 3-D Vs structure of the Pannonian region from joint earthquake and ambient noise Rayleigh wave tomography

Máté Timkó, Amr El‐Sharkawy, Lars Wiesenberg, László I. Fodor et autres

SUMMARY The Pannonian Basin, situated in Central Europe, is surrounded by the Alpine, Carpathian and Dinaric orogens. To understand its tectonic characteristics and evolution, we determine a shear wave velocity model of its crust, mantle lithosphere and asthenosphere consistently by jointly inverting …

hu, de, Égypte, gb (code pays fourni par la source)

Understanding the Adjoint Method in Seismology: Theory and Implementation in the Time Domain

Rafael Abreu

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Studying inner core and lower mantle structure with a combination of PKP and converted SKP and PKS waves

Samira Hosseini, Christine Thomas, Edward J. Garnero, Rafael Abreu

SUMMARY Structure of the inner core is often measured through traveltime differences between waves that enter the inner core (PKPdf) and waves that travel through the outer core only (PKPab and PKPbc). Here we extend the method to converted waves PKSdf and …

de, us (code pays fourni par la source)

Deep Earth rotational seismology

Rafael Abreu, S. Durand, Sebastian Rost, Christine Thomas

SUMMARY Rotational seismology opens a new avenue to study the deep interior of the Earth. Using data from the Wettzell Observatorium, Germany, where a ring laser gyroscope and a 3-component translational broadband seismometer are co-located, we report the presence of clear S, …

fr, de, gb (code pays fourni par la source)

A Guide for Evaluation of the Architectural Design Requirements of Energy Efficiency in City Hotels

Mario Luis Paneque Vázquez, Rafael Abreu, Enrique D ́ Jesús Jiménez Anaya, Juan Carlos García Sam

Tourism is a sector of great importance in the economic sphere, but it is also one of the services most consumers of conventional energy, for this reason it is necessary to generate strategies aimed at promoting the use of renewable energy sources. …

cu, gb, pr (code pays fourni par la source)

Bayesian analysis of azimuthal anisotropy in the Alpine lithosphere from beamforming of ambient noise cross-correlations

Dorian Soergel, Helle Anette Pedersen, Thomas Bodin, Anne Paul et autres

SUMMARY Surface waves extracted from ambient noise cross-correlations can be used to study depth variations of azimuthal anisotropy in the crust and upper mantle, complementing XKS splitting observations. In this work, we propose a novel approach based on beamforming to estimate azimuthal …

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