The July 1986 Chalfant Valley, California, earthquake sequence: Preliminary results

Cockerham, Robert S.; Corbett, Edward J.

doi:10.1785/bssa0770010280

Cited by 41 publications

(1 citation statement)

References 9 publications

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“…The hypocenter locations for the Chalfant Valley earthquake reported by previous studies are fairly similar (varying horizontally < 1 km), while the interpretations of the focal mechanism and the fault dimensions show larger variations (Cockerham and Corbett, 1987;Pacheco and Na´beˇlek, 1988;Savage and Gross, 1995;Smith and Priestley, 2000). We use the published focal mechanisms for the event to assume an averaged fault orientation with a pure strike-slip focal mechanism for our simulations.…”

Section: Finite-fault Source Modelmentioning

confidence: 79%

Simulation of 0–7.5 Hz physics-based nonlinear ground motions for maximum credible earthquake scenarios at the Long Valley Dam, CA

Yeh,

Olsen

2024

Earthquake Spectra

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We have conducted three-dimensional (3D) 0–7.5 Hz physics-based wave propagation simulations to model the seismic response of the Long Valley Dam (LVD), which has formed Lake Crowley in Central California, to estimate peak ground motions and settlement of the dam expected during maximum credible earthquake (MCE) scenarios on the nearby Hilton Creek Fault (HCF). We calibrated the velocity structure, anelastic attenuation model, and the overall elastic properties of the dam via linear simulations of a Mw 3.7 event as well as the Mw 6.2 Chalfant Valley earthquake of 1986, constrained by observed ground motions on and nearby the LVD. The Statewide California Earthquake Center (SCEC) Community Velocity Model CVM-S4.26.M01 superimposed with a geotechnical layer using [Formula: see text] information tapered from the surface to a 700-m depth was used in the simulations. We found optimal fit of simulated and observed ground motions at the LVD using frequency-independent attenuation of [Formula: see text] ([Formula: see text] in m/s). Using the calibrated model, we simulated 3D nonlinear ground motions at the LVD for Mw 6.6 rupture scenarios on the HCF using an Iwan-type, multi-yield-surface technique. We use a two-step method where the computationally expensive nonlinear calculations were carried out in a small domain with the plane wave excitation along the bottom boundary obtained from a full-domain 3D linear finite-fault simulation. Our nonlinear MCE simulation results show that peak ground velocities (PGVs) and peak ground accelerations (PGAs) as high as 72 cm/s and 0.55 g, respectively, can be expected at the crest of the LVD. Compared with linear ground motion simulation results, our results show that Iwan nonlinear damping reduces PGAs on the dam crest by up to a factor of 8 and increasingly depletes the high-frequency content of the waves toward the dam crest. We find horizontal relative displacements of the material inside the dam of up to [Formula: see text] and up to [Formula: see text] of vertical subsidence, equivalent to 1% of the dam height.

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Section: Finite-fault Source Modelmentioning

confidence: 79%

Simulation of 0–7.5 Hz physics-based nonlinear ground motions for maximum credible earthquake scenarios at the Long Valley Dam, CA

Yeh,

Olsen

2024

Earthquake Spectra

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Regional Difference in Scaling Laws for Large Earthquakes and its Tectonic Implication

Fujii¹,

Matsu’ura²

2000

Microscopic and Macroscopic Simulation: Towards Predictive Modelling of the Earthquake Process

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Temperatures at the Base of the Seismogenic Crust Beneath Long Valley Caldera, California, and the Phlegrean Fields Caldera, Italy

Hill¹

1992

IAVCEI Proceedings in Volcanology

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The July 1986 Chalfant Valley, California, earthquake sequence: Preliminary results

Cited by 41 publications

References 9 publications

Simulation of 0–7.5 Hz physics-based nonlinear ground motions for maximum credible earthquake scenarios at the Long Valley Dam, CA

Simulation of 0–7.5 Hz physics-based nonlinear ground motions for maximum credible earthquake scenarios at the Long Valley Dam, CA

Regional Difference in Scaling Laws for Large Earthquakes and its Tectonic Implication

Temperatures at the Base of the Seismogenic Crust Beneath Long Valley Caldera, California, and the Phlegrean Fields Caldera, Italy

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