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Published in: Rock Mechanics and Rock Engineering 4/2024

08-01-2024 | Original Paper

Analysis of Near-Field Stresses in an Analogue Strike-Slip Fault Model

Authors: Zhandong Su, Sizhe Zhou, Arno Zang, Jinzhong Sun, Tao Zhang, Yao Niu, Jianyong Zhang, Jinping Liang

Published in: Rock Mechanics and Rock Engineering | Issue 4/2024

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Abstract

The evolution of the local stress field of faults under tectonic stresses is crucial to predict earthquakes. In this study, we investigated the stress sensitivity of an analogue fault model with dimensions of 2 m × 1 m × 1 m, prepared from cement, gypsum, river sand, putty powder, and borax mixture. The angle between the fault strike and the maximum stress direction was varied, and the variation in the stress near the analogue fault (area 1200 × 400 mm; width 5 mm) was determined. The crack growth law of the analogue fault was found to be consistent with a simple Riedel shear model. A main strike-displacement zone was formed, and its direction was parallel to that of the analogue fault. Fault development was described by three stages based on stress–strain relationships: a nucleus stage, a stable growth, and an unstable growth stage. The deflection angle (the deflection angle of the local principal stresses) range of the local stress field was (− 45°, 45°), and it varied most significantly in the nucleus stage. The closer to the fault, the greater the variation range in the deflection angle. The variation range was greater in the fault compression quadrants than in the dilatation quadrants. The correlation between the deflection angle and the relative deformation velocity of the fault was stronger in the stable growth stage than in the other stages. In this stage, the angle–deformation–velocity correlation could be well fitted using a logistic trend model. These findings can be of importance to better understand the nucleation and mechanisms of fault slip-induced earthquakes under varying fault-strike-stress conditions.

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Metadata
Title
Analysis of Near-Field Stresses in an Analogue Strike-Slip Fault Model
Authors
Zhandong Su
Sizhe Zhou
Arno Zang
Jinzhong Sun
Tao Zhang
Yao Niu
Jianyong Zhang
Jinping Liang
Publication date
08-01-2024
Publisher
Springer Vienna
Published in
Rock Mechanics and Rock Engineering / Issue 4/2024
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-023-03714-4

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