Evidence of site amplification from ground motion of the last two large crustal earthquakes in central-western Argentina

Alvarado, Patricia; Christiansen, Rodolfo; Gregori, Salvador Daniel; Sáez, Mauro

doi:10.1007/s11069-020-03943-8

Cited by 3 publications

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“…b Scenario two slip rates are based on ages that assumed a 5 mm/ka erosion rate and that were not corrected for inheritance. sequence of the mainshock and aftershocks of the 1977 Caucete (San Juan, Argentina) earthquake, which was similarly distant from major cities, still caused strong ground-shaking, extensive liquefaction-related effects, and severe damage and triggering of shallow earthquakes on adjacent faults (Alvarado et al, 2020;INPRES, 1977INPRES, , 1982.…”

Section: Seismic Potential Of the Las Chacras Fault Zonementioning

confidence: 99%

“…from long recurrence intervals on slow-moving faults (Stein, 2007). Similar to the 1977 M w 7.5 Caucete (San Juan, Argentina) earthquake of the western Sierras Pampeanas, which involved motion along the adjacent Ampacama-Niquizanga fault (Bastías, 1985;Kadinsky-Cade et al, 1985;Langer & Hartzell, 1996;Volponi et al, 1978) (Figure 2), an earthquake with magnitude greater than ≥7 generated by the LCFZ could potentially cause damage to nearby smaller towns and cities in San Juan Province (Figure 2) and could be felt as far away as Buenos Aires (∼900 km away) (Alvarado et al, 2020).…”

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Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

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Quaternary Andean backarc deformation within the Pampean segment (27-33.5°S) related to the convergence of the Nazca and South American plates is widely distributed, extending up to 700 km east from the Perú-Chile trench (Figure 1a). The plate margin encompasses the thin-skinned fold-and-thrust belts of the Andean Main Cordillera, Frontal Cordillera, and Precordillera in the west, and the thick-skinned reverse faults of the Sierras Pampeanas in the east (Figure 1b). This wide distribution and partitioning of deformation among structures with different tectonic styles has been associated with subduction of a shallowly dipping section of the Nazca plate at these latitudes, known as the Pampean flat-slab segment (Figure 1b;

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Section: Seismic Potential Of the Las Chacras Fault Zonementioning

confidence: 99%

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Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

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Estimation of the dynamic amplification factor at backfill soil behind a gravity wall

JosephMonica

Banerjee

Pakrashi

2021

Geotechnical Research

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The response of gravity retaining walls under strong earthquake motions is a topic of concern since large catastrophic failures have become more frequent during earthquake and post-earthquake events. Neglecting the amplification of ground motion along the surface was an important reason for severe damages in the 1985 Mexico City earthquake and the 1989 Loma Prieta earthquake. In this paper, the response of a gravity retaining wall under different earthquake motions is analysed using a two-dimensional finite-difference method. The strong-motion parameters, peak ground acceleration (PGA) and predominant frequency are particularly investigated. The responses of the retaining wall in terms of the relative horizontal displacement of the wall, active pressure on the wall and response spectra are analysed for input motions with varying PGA and predominant frequency. An empirical equation for the amplification factor at the top of the wall is developed as a function of the PGA and predominant frequency from the observed results. Such an equation can be particularly helpful for rapid assessments of gravity retaining walls in terms of their earthquake resilience and can be assimilated within the design process with relative ease.

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Obtaining the Transfer Function in One Dimensional Soil Amplification Analysis with Modified Finite Element Transfer Matrix Method

Bilican

Bozdoğan

Keskin

2021

Türk Deprem Araştırma Dergisi

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Highlights*Practical derivation of the transfer function *In the presented method, the system matrix is independent of the number of elements *The presented method can be easily adapted to analysis in frequency and time history Acknowledgements Supports (with project numbers), name of institutions: e.g.; AFAD, TUBITAK, Governorship, Municipality, etc. AimA method is proposed to obtain Transfer functions used in one-dimensional soil amplification Location Methods MFETM method was adapted to the problem of finding transfer functions used in soil amplification analysis ResultsIn the classical finite element method, the system matrix that increases depending on the number of elements is independent of the number of elements in the MFETM method.

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Evidence of site amplification from ground motion of the last two large crustal earthquakes in central-western Argentina

Cited by 3 publications

References 16 publications

Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

Estimation of the dynamic amplification factor at backfill soil behind a gravity wall

Obtaining the Transfer Function in One Dimensional Soil Amplification Analysis with Modified Finite Element Transfer Matrix Method

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