Reconciling the conflicting extent of overriding plate deformation before and during megathrust earthquakes in South America, Southeast Asia, and Japan

D'Acquisto, Mario; Broerse, Taco; Marsman, Celine; Govers, Rob

doi:10.1002/essoar.10511189.1

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“…For the convenience of discussion in this paper, following the concept of prolonged postseismic phase, and similar to Sun et al. (2018), we semantically define the apparent finishing time of the postseismic phase ( t B ) as the dividing boundary pass through the trench distance of 16 H (about 500 km), which is representative of the backarc region globally and is roughly the maximum distance of observable interseismic deformation (D'Acquisto et al., 2022; McKenzie et al., 2022). At this time, the surface deformation pattern is mostly wholesale landward and hence it is also stated as the beginning time of the interseismic phase.…”

Section: Viscoelastic Earthquake‐cycle Modelsmentioning

confidence: 99%

How Long Can the Postseismic and Interseismic Phases of Great Subduction Earthquake Sustain? Toward an Integrated Earthquake‐Cycle Perspective

Chen

2023

Geophysical Research Letters

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The transition of subduction systems from postseismic to interseismic phase is an important indicator of their stress state and readiness for subsequent events. However, understanding the dynamics of this transition of megathrust earthquakes is hindered by the short instrumental time compared to the centuries‐long recurrence interval (T). Here, with an updated earthquake‐cycle perspective of global spatiotemporally limited geodetic observations, we use generic viscoelastic earthquake‐cycle models to explore the evolution of time‐varying surface deformation. Self‐consistently, our models reproduce key observed features of the deformation cycle, suggesting common processes activated at different margins. The relative postseismic and interseismic durations are found dependent mainly nonlinearly on the ratio of T to mantle viscosity, with a plausible range of ∼0.2–0.4T at representative margins and minimum >0.55T, respectively. Our results thus provide a useful tool for understanding the similarities and differences of earthquake‐cycle deformation and guiding monitoring of possible future signals at world‐wide subduction zones.

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Section: Viscoelastic Earthquake‐cycle Modelsmentioning

confidence: 99%

How Long Can the Postseismic and Interseismic Phases of Great Subduction Earthquake Sustain? Toward an Integrated Earthquake‐Cycle Perspective

Chen

2023

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

Reconciling the conflicting extent of overriding plate deformation before and during megathrust earthquakes in South America, Southeast Asia, and Japan

Cited by 1 publication

References 0 publications

How Long Can the Postseismic and Interseismic Phases of Great Subduction Earthquake Sustain? Toward an Integrated Earthquake‐Cycle Perspective

How Long Can the Postseismic and Interseismic Phases of Great Subduction Earthquake Sustain? Toward an Integrated Earthquake‐Cycle Perspective

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