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Updated: May 3, 2026

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単一のCCTVカメラから地震源の特性を直接推定する

Soumaya Latour1, Mathias Lebihain2, Harsha S Bhat3

  • 1Université de Toulouse, CNRS, Observatoire Midi-Pyrénées, IRAP, Toulouse, France.

Science (New York, N.Y.)
|October 30, 2025
PubMed
まとめ

研究者は2025年のマンダレー地震のシーズミック・リプチャー・スリップ・レートをCCTV映像を使って直接測定した. 研究は,ピークスライド速度 ~3.5m/sのパルスのような破裂を明らかにします.

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Microcracking in Concrete01:20

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
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