Results 111 to 120 of about 35,702 (291)

Upper mantle P velocity structure beneath the Midwestern United States derived from triplicated waveforms [PDF]

, 2012
Upper mantle seismic velocity structures in both vertical and horizontal directions are key to understanding the structure and mechanics of tectonic plates.
Chu, Risheng, Helmberger, Don V., Schmandt, Brandon   +2 more
core  

Performance enhancement of reinforced concrete columns using stainless steel and galvanized steel plates: Experimental and numerical investigation

Structural Concrete, EarlyView.
Abstract This study introduces an innovative approach to strengthening defected reinforced concrete (RC) columns using externally bonded stainless steel and galvanized steel plates. Unlike conventional strengthening methods, this technique replaces traditional transverse stirrups with steel sheets, providing enhanced confinement and ductility.
Ahmed Hamoda, Khaled Sennah, Ramy I. Shahin, Aref A. Abadel, Mizan Ahmed, Mohamed Ghalla   +5 more
wiley   +1 more source

Lithosphere structures dynamics in the central High Atlas (Morocco) by seismic tomography and gravimetric data

Geodesy and Geodynamics, 2019
We investigate sedimentological and tectonic processes at the central High Atlas, in order to understand their functioning and to build a geodynamic model that placed the area in its current geological frame.
Y. Timoulali, M. Bouiflane, G. Bouskri, R. Azguet, Y. El Fellah   +4 more
doaj   +1 more source

Diffraction and seismic tomography [PDF]

Geophysical Journal International, 1992
SUMMARY Diffraction tomography is formulated in such a way that the data (traveltime4r waveform perturbations) are related to the medium perturbations through the sum of two terms. The first term is the ray integral of ordinary tomography and involves only phase perturbations.
openaire   +1 more source

Flexural performance of concrete‐filled steel tubular beams with wood chip aggregate

Structural Concrete, EarlyView.
Abstract This study investigates the flexural performance of concrete‐filled steel tubular (CFST) beams with partial replacement of aggregates by wood chips (0%–25%) through experimental and numerical analysis. This study is novel in that it experimentally and numerically investigates the flexural behavior of CFST beams with partial replacement of ...
Mizan Ahmed, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Wensu Chen, Xihong Zhang, Faiz Shaikh, Ahmed Hamoda   +6 more
wiley   +1 more source

Application of structural constraint grid tomography velocity modeling in Nanchuan area

Youqicang pingjia yu kaifa, 2020
All the reasons that the surface limestone is exposed in a large area, the signal-to-noise ratio of seismic data is low, the underground structure is complex, and the dip angle of strata is steep make Nanchuan area to be a typical double-complex seismic ...
REN Junxing, MENG Qingli, YANG Fan
doaj  

TRM‐to‐concrete interface bond without anchors: Combined experimental, analytical, and numerical modeling approach

Structural Concrete, EarlyView.
Abstract Textile reinforced mortar (TRM) systems have emerged as an effective alternative to conventional FRP strengthening solutions due to their compatibility with concrete substrates and favorable performance under adverse environmental conditions.
Ömer Mercimek, Özlem Çalışkan, Özgür Anıl, R. Tuğrul Erdem, Murat Yüncüler   +4 more
wiley   +1 more source

Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography. [PDF]

Sci Rep, 2021
Sun Q, Pei S, Cui Z, Chen YJ, Liu Y, Xue X, Li J, Li L, Zuo H.   +8 more
europepmc   +1 more source

2D Near‐Surface Full‐Waveform Tomography Reveals Bedrock Controls on Critical Zone Architecture

Earth and Space Science
For decades, seismic imaging methods have been used to study the critical zone, Earth's thin, life‐supporting skin. The vast majority of critical zone seismic studies use traveltime tomography, which poorly resolves heterogeneity at many scales relevant ...
B. J. Eppinger, W. S. Holbrook, Z. Liu, B. A. Flinchum, J. Tromp   +4 more
doaj   +1 more source

Fast Kalman Filter using Hierarchical-matrices and low-rank perturbative approach

, 2015
We develop a fast algorithm for Kalman Filter applied to the random walk forecast model. The key idea is an efficient representation of the estimate covariance matrix at each time-step as a weighted sum of two contributions - the process noise covariance
Kitanidis, Peter K., Miller, Eric, Saibaba, Arvind K.   +2 more
core   +1 more source