Fault‐Zone Damage Promotes Pulse‐Like Rupture and Back‐Propagating Fronts via Quasi‐Static Effects

Idini, Benjamín; Ampuero, Jean‐Paul

doi:10.1029/2020gl090736

Cited by 28 publications

(35 citation statements)

References 67 publications

(118 reference statements)

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“…Note that the main rupture is not only a pure unilateral but shows bilateral rupture toward both west and east (Figure 3b). The eastern wing of rupture propagating back‐toward the epicenter may have broken the region, in which the rupture was not able to propagate during the initial rupture episode, which may support the hypothesis that the main rupture is rather an individual rupture episode, involving a possible back‐propagation of rupture (e.g., Hicks et al., 2020; Idini & Ampuero, 2020).…”

Section: Discussionmentioning

confidence: 76%

Rupture Process of the 2020 Caribbean Earthquake Along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

Tadapansawut

Okuwaki

Yagi

et al. 2021

Geophysical Research Letters

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Section: Discussionmentioning

confidence: 76%

Rupture Process of the 2020 Caribbean Earthquake Along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

Tadapansawut

Okuwaki

Yagi

et al. 2021

Geophysical Research Letters

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“…All three scenarios show complex rupture sequences. Rupture cascading across multiple fault segments leads to rupture front segmentation.3D subsurface impedance contrasts and free surface interactions cause additional rupture complexity such as healing due to reflected and interface waves (e.g., Dunham, 2005;Huang & Ampuero, 2011) and back-propagating rupture fronts (e.g., Beroza & Spudich, 1988;Idini & Ampuero, 2020).…”

Section: Dynamic Rupture Scenarios For a Highly Segmented Húsavík-fla...mentioning

confidence: 99%

Physics-based dynamic rupture models, fault interaction and ground motion simulations for the segmented Húsavík-Flatey Fault Zone, Northern Iceland

Li¹,

Gabriel

Ulrich

et al. 2022

Preprint

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We present 3-D spontaneous dynamic rupture earthquake scenarios for the Húsavík-Flatey Fault Zone (HFFZ) in Northern Iceland. We construct three fault system models consisting of up to 55 segments of varying geometric complexity. By varying hypocenter locations, we analyze rupture dynamics, fault interactions and their associated ground motions and observational uncertainties in 79 scenarios. We use regional observations to constrain 3-D subsurface velocities and viscoelastic attenuation as well as fault stress and strength. Our models account for topo-bathymetry, off-fault plasticity and we explore the effect of fault roughness. Our spontaneous dynamic rupture scenarios can match historic magnitudes. We show that the fault system segmentation and geometry, hypocenter locations, initial stress conditions and fault roughness have strong effects on multi-fault rupture dynamics across the HFFZ. Breaking of different portions of the same fault system leads to varying rupture dynamics, slip distributions and magnitudes. All dynamic rupture scenarios yield highly heterogeneous near-field ground motions. We observe amplification from rupture directivity, geometric complexities, and amplification and shielding due to topography. We recover a magnitude-consistent attenuation relationship in good agreement with new regional empirical ground motion models. Physics-based ground motion variability changes with distance and increases for unilateral vs. bilateral rupture. Our study illustrates important ingredients for fully physics-based, regional earthquake scenarios, their respective importance for rupture dynamics and ground motion modeling and how they can be observationally constrained and verified. We entail that dynamic rupture scenarios can be useful for non-ergodic probabilistic seismic hazard assessment, specifically in data-limited regions.

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“…Note that the main rupture is not only a pure unilateral but shows bilateral rupture toward both west and east (Figure 3b). The eastern wing of rupture propagating back-toward the epicenter may have broken the region, in which the rupture was not able to propagate during the initial rupture episode, which may support the hypothesis that the main rupture is rather an individual rupture episode, involving a possible back-propagation of rupture (e.g., Hicks et al, 2020;Idini & Ampuero, 2020).…”

Section: Discussionmentioning

confidence: 71%

Rupture Process of the 2020 Caribbean Earthquake along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

Tadapansawut

Okuwaki

Yagi

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

Fault‐Zone Damage Promotes Pulse‐Like Rupture and Back‐Propagating Fronts via Quasi‐Static Effects

Cited by 28 publications

References 67 publications

Rupture Process of the 2020 Caribbean Earthquake Along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

Rupture Process of the 2020 Caribbean Earthquake Along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

Physics-based dynamic rupture models, fault interaction and ground motion simulations for the segmented Húsavík-Flatey Fault Zone, Northern Iceland

Rupture Process of the 2020 Caribbean Earthquake along the Oriente Transform Fault, Involving Supershear Rupture and Geometric Complexity of Fault

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