Seismo-hydro-mechanical modelling of the seismic cycle: Methodology and implications for subduction zone seismicity

Petrini, Claudio; Gerya, Taras; Yarushina, Viktoriya; Dinther, Ylona van; Connolly, J. A. D.; Madonna, Claudio

doi:10.1016/j.tecto.2020.228504

Cited by 35 publications

(59 citation statements)

References 94 publications

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“…However, dehydration and decarbonation reactions 32 may also provide direct (and substantial) high-pressure fluid sources within the fault zone that then diffuse into co-seismically generated damage zones 33 at timescales that depend on the permeability structure. Recent numerical studies 34 demonstrated a new and additional mechanism for generating high fluid pressures co-seismically by self-pressurization of fluid-bearing fault zones through elasto-plastic collapse of rapidly deforming fluid-filled pores. The co-seismically generated fault zone also provides a highly permeable conduit that can link to deeply trapped, supra-hydrostatic fluid reservoirs 18 , 35 .…”

Section: Resultsmentioning

confidence: 99%

Aftershocks are fluid-driven and decay rates controlled by permeability dynamics

Miller

2020

Nat Commun

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One aspect of earthquake physics not adequately addressed is why some earthquakes generate thousands of aftershocks while other earthquakes generate few, if any, aftershocks. It also remains unknown why aftershock rates decay as ~1/time. Here, I show that these two are linked, with a dearth of aftershocks reflecting the absence of high-pressure fluid sources at depth, while rich and long-lasting aftershock sequences reflect tapping high-pressure fluid reservoirs that drive aftershock sequences. Using a physical model that captures the dominant aspects of permeability dynamics in the crust, I show that the model generates superior fits to observations than widely used empirical fits such as the Omori-Utsu Law, and find a functional relationship between aftershock decay rates and the tectonic ability to heal the co- and post-seismically generated fracture networks. These results have far-reaching implications, and can help interpret other observations such as seismic velocity recovery, attenuation, and migration.

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Section: Resultsmentioning

confidence: 99%

Aftershocks are fluid-driven and decay rates controlled by permeability dynamics

Miller

2020

Nat Commun

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“…V. Gerya, 2011;Faccenda et al, 2012;Arcay, 2017;Beall et al, 2021), leading to insights into subduction dynamics and estimates of the depth of intermediate-depth seismicity and the geometry of the megathrust. When these types of models additionally account for an inertia term in so-called seismo-thermo-mechanical models, megathrust slip events are resolved allowing for estimates of the maximum size of the seismogenic zone and the distribution of seismicity in a given subduction geometry van Dinther, Gerya, Dalguer, Corbi, et al, 2013;van Dinther et al, 2014;Herrendörfer et al, 2015;Van Zelst et al, 2019;Petrini et al, 2020;Brizzi et al, 2020). These types of modelling have the advantage that the temperature can be calculated across the entire subduction zone with arbitrary resolution.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature-dependent material properties on simple thermal models of subduction zones

Zelst¹,

Thieulot²,

Craig³

2022

Preprint

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“…Many engineering and natural processes in the Earth involve coupled rock deformation and fluid flow (Cai & Bercovici, 2013; Connolly & Podladchikov, 2015; Keller et al, 2013; Petrini et al, 2020; Yarushina et al, 2013). Models describing fluid flow in deformable porous rocks can be based in part on the principles of irreversible thermodynamics (Yarushina & Podladchikov, 2015).…”

Section: Introductionmentioning

confidence: 99%

Model for (De)Compaction and Porosity Waves in Porous Rocks Under Shear Stresses

2020

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An understanding of instantaneous and long‐term compaction of porous rocks is important for reservoir engineering and Earth sciences. Experience from laboratory triaxial compression tests and from subsurface operations indicates that shear and volumetric deformations are interdependent. Their mutual dependence results in shear‐enhanced compaction and shear‐induced dilation under short‐term and long‐term loading. Using a classical averaging approach, we consider the evolution of a single fluid‐filled pore in a solid elastoplastic or viscoplastic matrix under combined pressure and shear loading to introduce a new failure envelope and 3‐D constitutive relations for both rate‐dependent and rate‐independent deformation of porous rocks. Our model provides a simple description of rock behavior under a wide range of strain rates. The model predictions agree well with experimental data from triaxial instantaneous and creep tests. Analytical and numerical solutions for solitary porosity wave propagation in viscoplastic rocks in the presence of shear were obtained. New solutions show that new rheological laws have serious implications for porosity waves. Plasticity onset leads to compaction‐decompaction asymmetry and the formation of elongated channel‐like porosity waves. Shear‐induced dilation facilitates porosity wave propagation at fluid pressures below the lithostatic stress. This makes porosity waves a viable mechanism in the formation of focused fluid flow structures in crustal rocks.

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Seismo-hydro-mechanical modelling of the seismic cycle: Methodology and implications for subduction zone seismicity

Cited by 35 publications

References 94 publications

Aftershocks are fluid-driven and decay rates controlled by permeability dynamics

Aftershocks are fluid-driven and decay rates controlled by permeability dynamics

The effect of temperature-dependent material properties on simple thermal models of subduction zones

Model for (De)Compaction and Porosity Waves in Porous Rocks Under Shear Stresses

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