Qingpei Sun

University of Hong Kong

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Klaus Regenauer‐Lieb

UNSW Sydney

Manman Hu

University of Hong Kong

Christoph Schrank

Queensland University of Technology

Xiao Chen

Australian Resources Research Centre

Hamid Roshan

UNSW Sydney

Piotr Szymczak

University of Warsaw

Oliver Gaede

Queensland University of Technology

Ali Karrech

University of Western Australia

Ulrich Kelka

Australian Resources Research Centre

Tomasz Blach

UNSW Sydney

Cooperative Institutions

UNSW Sydney

Australian Resources Research Centre

University of Western Australia

Queensland University of Technology

Commonwealth Scientific and Industrial Research Organisation

Curtin University

Mineral Resources

University of Hong Kong

Johannes Gutenberg University Mainz

Isfahan University of Technology

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A Thermodynamically Based Modified Cam‐Clay Model for Post‐Bifurcation Behavior of Deformation Bands

Journal of Geophysical Research Solid Earth (2024)

Qingpei Sun Xiao Chen Klaus Regenauer‐Lieb Manman Hu

Abstract Compaction bands are a type of localized deformation that can occur as diffuse or discrete bands in porous rocks. While modeling of shear bands can replicate discrete and diffusive bands, numerical models of compaction have so far only been able to describe the formation of discrete compaction bands. In this study, we present a new thermodynamic approach to model compaction bands that is able to capture both discrete and diffuse compaction band growth. The approach is based on a reaction‐diffusion formalism that includes an additional entropy flux. This entropic velocity regularizes the solution, by introducing a characteristic diffusion length scale and controlling the mode change from discrete to diffusive post‐localisation growth. The approach is used to model compaction band growth in highly porous carbonates. The model can replicate the areas of material damage exhibiting reduced porosity which are often observed as nuclei for the growth of compaction bands in experiments. The model also has the versatility to predict the formation of diffuse compaction bands, which is a significant advance in the field of compaction band modeling. The method can potentially be used for investigating the effect of material heterogeneities on compaction band growth and is heuristic for developing new methodologies for forecasting compaction band formation.

10.1029/2023jb028100

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Cross-Scale Dynamic Interactions in Compacting Porous Geomaterials as a Trigger to Instabilities

Springer series in geomechanics and geoengineering (2022)

Qingpei Sun Manman Hu Klaus Regenauer‐Lieb

Reaction–diffusion system

10.1007/978-3-031-22213-9_8

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Inversion of fluid-release rates from episodic tremor and slip signals in subduction zones via a coarse-grained reaction diffusion model

Physics of The Earth and Planetary Interiors (2024)

Qingpei Sun Klaus Regenauer‐Lieb Manman Hu

10.1016/j.pepi.2024.107223

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Cross-diffusion waves resulting from multiscale, multiphysics instabilities: application to earthquakes

Solid Earth (2021)

Klaus Regenauer‐Lieb Manman Hu Christoph Schrank Xiao Chen Santiago Peña Clavijo

Abstract. Theoretical approaches to earthquake instabilities propose shear-dominated source mechanisms. Here we take a fresh look at the role of possible volumetric instabilities preceding a shear instability. We investigate the phenomena that may prepare earthquake instabilities using the coupling of thermo-hydro-mechano-chemical reaction–diffusion equations in a THMC diffusion matrix. We show that the off-diagonal cross-diffusivities can give rise to a new class of waves known as cross-diffusion or quasi-soliton waves. Their unique property is that for critical conditions cross-diffusion waves can funnel wave energy into a stationary wave focus from large to small scale. We show that the rich solution space of the reaction–cross-diffusion approach to earthquake instabilities can recover classical Turing instabilities (periodic in space instabilities), Hopf bifurcations (spring-slider-like earthquake models), and a new class of quasi-soliton waves. Only the quasi-soliton waves can lead to extreme focussing of the wave energy into short-wavelength instabilities of short duration. The equivalent extreme event in ocean waves and optical fibres leads to the appearance of “rogue waves” and high energy pulses of light in photonics. In the context of hydromechanical coupling, a rogue wave would appear as a sudden fluid pressure spike. This spike is likely to cause unstable slip on a pre-existing (near-critically stressed) fault acting as a trigger for the ultimate (shear) seismic moment release.

Rogue wave

10.5194/se-12-1829-2021

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Rogue serpentinite-breakdown waves: a source mechanism for major subduction earthquakes?

Research Square (Research Square) (2023)

Manman Hu Qingpei Sun Klaus Regenauer‐Lieb

Abstract Episodic tremor and slip (ETS) in subduction megathrusts can accommodate plate motion in a silent manner without major damage. Yet, sometimes fast slip events seem to occur just prior to a large earthquake such as observed in New Zealand. Here, we show that the ETS and earthquake mechanisms can trigger each other in a two-way coupled manner due to the entanglement of fluid reactions and solid deformation within the slip zone. We propose that large earthquakes form as slab-wide network forming fluid-release events synchronising through nonlinear ultra-focusing excitation waves of the rogue-wave type. The generality of this approach renders it applicable to the nominally aseismic Cascadia subduction zone where the largest magnitude 9 event occurred 315 years ago.

Slab

10.21203/rs.3.rs-2361327/v1

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Cross-scale dynamic interactions in compacting porous media as a trigger to pattern formation

Geophysical Journal International (2022)

Manman Hu Qingpei Sun Christoph Schrank Klaus Regenauer‐Lieb

SUMMARY Patterns in nature are often interpreted as a product of reaction-diffusion processes which result in dissipative structures. Thermodynamic constraints allow prediction of the final state but the dynamic evolution of the microprocesses is hidden. We introduce a new microphysics-based approach that couples the microscale cross-constituent interactions to the large-scale dynamic behaviour, which leads to the discovery of a family of soliton-like excitation waves. These waves can appear in hydromechanically coupled porous media as a reaction to external stimuli. They arise, for instance, when mechanical forcing of the porous skeleton releases internal energy through a phase change, leading to tight coupling of the pressure in the solid matrix with the dissipation of the pore fluid pressure. In order to describe these complex multiscale interactions in a thermodynamic consistent framework, we consider a dual-continuum system, where the large-scale continuum properties of the matrix–fluid interaction are described by a reaction-self diffusion formulation, and the small-scale dissipation of internal energy by a reaction-cross diffusion formulation that spells out the macroscale reaction and relaxes the adiabatic constraint on the local reaction term in the conventional reaction-diffusion formalism. Using this approach, we recover the familiar Turing bifurcations (e.g. rhythmic metamorphic banding), Hopf bifurcations (e.g. Episodic Tremor and Slip) and present the new excitation wave phenomenon. The parametric space is investigated numerically and compared to serpentinite deformation in subduction zones.

Microscale chemistry

Poromechanics

10.1093/gji/ggac115

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Citations (14)