Moment rate of the 2018 Gulf of Alaska earthquake

Santini, Stefano; Dragoni, Michele

doi:10.1016/j.pepi.2019.106336

Cited by 2 publications

(3 citation statements)

References 19 publications

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“…The case of simultaneous asperity motion was considered by Santini and Dragoni (2020). The aim was to model the observed moment rate and seismic moment of the 2018 Gulf of Alaska earthquake, a magnitude 7.9 event originated by strike-slip faulting (Krabbenhoeft et al, 2018;Lay et al, 2018;Ruppert et al, 2018).…”

Section: Asperities With Different Areas and Strengthsmentioning

confidence: 99%

Discrete Fault Models

Dragoni

2022

Pure Appl. Geophys.

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Fault surfaces are characterized by an inhomogeneous friction distribution, that can be represented with asperity models. Fault mechanics is dominated by asperities, so that a fruitful approach is to use discrete models, where asperities are the basic elements and the state of the fault is described by the average values of stress, friction and slip on each asperity. Under reasonable assumptions, the equations of motion can be solved analytically, with a deeper understanding of the behavior of the system. Fault dynamics has a sticking mode, where asperities are stationary, and a number of slipping modes, corresponding to the separate or simultaneous motion of asperities. Any seismic event is a sequence of slipping modes and a large variety of source functions is possible. Many large earthquakes are observed to be the consequence of the failure of two asperities: a discrete two-asperity model shows a rich dynamics and allows a detailed study of interaction between asperities. In this framework, fault evolution during coseismic and interseismic intervals can be calculated in terms of fault slip, stress state, energy release and seismic spectrum, including viscoelastic relaxation, fault creep and stress perturbations from other faults. Discrete models may include interaction between neighboring faults, allowing to assess conditions for the occurrence of seismic sequences in a fault system. A review of recent work on this subject is presented with applications to real earthquakes.

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Section: Asperities With Different Areas and Strengthsmentioning

confidence: 99%

Discrete Fault Models

Dragoni

2022

Pure Appl. Geophys.

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“…Let A 1 and A 2 be the asperity areas and be the distance between the asperity centroids (Figure 1). The model is described in detail in [22,27].…”

Section: Fault Modelmentioning

confidence: 99%

“…Formulae for the calculation of the dimensional moment rate ṁ(t) and the final seismic moment m 0 for a 3-mode event with simultaneous asperity slip were given in [27].…”

Section: The Moment Ratementioning

confidence: 99%

Contribution of the 2010 Maule Megathrust Earthquake to the Heat Flow at the Peru-Chile Trench

Dragoni

Santini

2022

Energies

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The 2010 Maule earthquake was a megathrust event that occurred along the Peru–Chile Trench. The earthquake source can be modelled as a fault with two asperities with different areas and strengths. By employing a discrete fault model, where asperities are the basic elements, the event can be described as a sequence of three dynamic modes involving simultaneous asperity slip. Interaction between asperities by mutual stress transfer plays a crucial role during fault slip. With a careful choice of values for the model parameters, the mode durations, the slip distribution, the seismic moment rate and the final moment calculated from the model are found to be consistent with the observed values. An important amount of frictional heat is produced by an event of this size and is calculated by summing up the contributions of each asperity. The seismic event produces a heat pulse propagating through the Earth’s crust and contributing to the average heat flow in the region. The calculated heat production is equal to about 2×1017 J and the peak value of the heat pulse is equal to 6×10−3 mW m−2 or about 10−4 of the average surface heat flow density, with a characteristic diffusion time in the order of 106 a.

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Moment rate of the 2018 Gulf of Alaska earthquake

Cited by 2 publications

References 19 publications

Discrete Fault Models

Discrete Fault Models

Contribution of the 2010 Maule Megathrust Earthquake to the Heat Flow at the Peru-Chile Trench

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