Spontaneous complexity in the dynamics of slow laboratory earthquakes

G. Pozzi (), G. Volpe, J. Taddeucci, M. Cocco, C. Marone and C. Collettini
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G. Pozzi: University of Padova
G. Volpe: La Sapienza University of Rome
J. Taddeucci: Istituto Nazionale Di Geofisica e Vulcanologia (INGV)
M. Cocco: Istituto Nazionale Di Geofisica e Vulcanologia (INGV)
C. Marone: La Sapienza University of Rome
C. Collettini: Istituto Nazionale Di Geofisica e Vulcanologia (INGV)

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract Rock deformation experiments play a key role in our understanding of earthquake physics and friction constitutive laws. These laws commonly describe the response of analogue laboratory faults as a simple and homogeneous system, without accounting for the spatial-temporal evolution of structures in the sample. However, increasing experimental evidence suggests that slip instability is closely tied to heterogeneity, complex rheologies, and inhomogeneous boundary conditions. To address this, we designed a transparent setup to observe real-time deformation, track the spatial-temporal evolution of shear fabric, and document unstable slip in experimental faults. Our video documentation reveals that the progressive development of fault fabrics results in heterogeneous but not random stress redistribution. Here we show that stress and structural heterogeneities play a key role in the nucleation, propagation, and arrest of slip instabilities, raising questions about the robustness of scaling laboratory frictional laws to nature.

Date: 2025
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DOI: 10.1038/s41467-025-63984-0

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