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Seismic performance of a reinforced concrete bridge under a sequence of seismic shocks using the concrete damage plasticity model

100%

Boroń P. , Dulińska J.

Czasopismo Techniczne. Budownictwo

2016

tom Y. 113, iss. 3-B

15--29

This paper investigates the dynamic performance of a concrete bridge under a sequence of earthquakes. The PGA of the mainshock and the aftershock were comparable. The concrete damage plasticity model of material was assumed to represent the plastic behaviour of the bridge. Firstly, the mainshock was applied to the bridge, then the aftershock was imposed on the structure which had already been weakened by the first shock. The analysis of plastic and damage measures revealed that the aftershock had a considerable effect upon the structure in terms of enlarging zones affected by irreversible strains or additional damage evolution.

W artykule przedstawiono analizę odpowiedzi dynamicznej mostu żelbetowego na sekwencję wstrząsów sejsmicznych. Wartości PGA dla wstrząsu głównego oraz wtórnego były porównywalne. W celu przedstawienia plastycznej pracy konstrukcji zastosowano model betonu plastyczny ze zniszczeniem. Analiza stref plastycznych oraz uszkodzeń elementów wykazała znaczący wpływ obu wstrząsów na konstrukcję. Wstrząs wtórny, działający na konstrukcję wcześniej uszkodzoną przez wstrząs główny, wywołuje zwiększenie strefy odkształceń plastycznych, rozwój zarysowań oraz degradację sztywności.

Scaling properties of the Mw7.0 Samos (Greece), 2020 aftershock sequence

84%

Vallianatos F. , Pavlou K.

Acta Geophysica

2021

tom Vol. 69, no. 3

1067--1084

On October 30, 2020, a strong and shallow earthquake (Mw=7.0) hit Samos, an island on the eastern edge of the Aegean Sea (Greece). The epicenter was located on the north ofshore of the Greek island of Samos. The goal of our work is to provide a frst analysis of the scaling properties observed in the aftershock sequence as reported until December 31, 2020, as numerous seismic clusters activated. Our analysis is focused on the main of the clusters observed in the East area of the activated fault zone and strongly related with the mainshock’s fault. The aftershock sequence follows the Omori law with a value of p ≈ 1.01 for the main cluster which is remarkably close to a logarithmic evolution. The analysis of interevent times distribution, based on non-extensive statistical physics indicates a system in an anomalous equilibrium with a crossover from anomalous (q>1) to normal (q=1) statistical mechanics, as great interevent times approached. A discussion of the crossover observed, is given in terms of superstatistics. In addition, the obtained value q ≈ 1.67 suggests a system with one degree of freedom. Furthermore, a scaling of the migration of aftershock zone as a function of the logarithm of time is discussed in terms of rate strengthening rheology that govern the evolution of afterslip process.

The 2014 Kefalonia Doublet (Mw6.1 and Mw6.0), Central Ionian Islands, Greece: Seismotectonic Implications along the Kefalonia Transform Fault Zone

84%

Karakostas V. , Papadimitriou E. , Mesimeri M. , Paradisopoulou P. , Gkarlaouni C.

Acta Geophysica

2015

tom Vol. 63, no. 1

1--16

The 2014 Kefalonia earthquake sequence started on 26 January with the first main shock (Mw 6.1) and aftershock activity extending over 35 km, much longer than expected from the causative fault segment. The second main shock (Mw 6.0) occurred on 3 February on an adjacent fault segment, where the aftershock distribution was remarkably sparse, evidently encouraged by stress transfer of the first main shock. The aftershocks from the regional catalog were relocated using a 7-layer velocity model and station residuals, and their distribution evidenced two adjacent fault segments striking almost N-S and dipping to the east, in full agreement with the centroid moment tensor solutions, constituting segments of the Kefalonia Transform Fault (KTF). The KTF is bounded to the north by oblique parallel smaller fault segments, linking KTF with its northward continuation, the Lefkada Fault.

The seismogenic tectonic of Anchorage Mw7.0 Earthquake in Alaska, November, 30, 2018

84%

Lei D. , Yang G.

Acta Geophysica

2020

tom Vol. 68, no. 3

619--626

The Mw7.0 Anchorage earthquake is most signifcant event since 1964 Mw9.2. Far away subduction zone trace, thus the seismogenic structure and failure plane are not clear and keep disputed. Based on published data, including faults, aftershock, focal mechanism solutions and source fault model and so on, we make comprehensive analysis and discussion. We think that this earthquake belongs to plate subduction event, without relationship with Castle Mountain fault and Border Ranges fault for seismogenic structure, only earthquake-controlling structure. Both faults are not responsible for the Anchorage earthquake. The actual seismogenic fault plane has a south-to-north trending and dips to east, which is corresponding to the nodal plane I.

Scaling Analysis of Time Distribution between Successive Earthquakes in Aftershock Sequences

84%

Marekova E.

Acta Geophysica

2016

tom Vol. 64, no. 4

885--903

The earthquake inter-event time distribution is studied, using catalogs for different recent aftershock sequences. For aftershock sequences following the Modified Omori’s Formula (MOF) it seems clear that the inter-event distribution is a power law. The parameters of this law are defined and they prove to be higher than the calculated value (2 – 1/p). Based on the analysis of the catalogs, it is determined that the probability densities of the inter-event time distribution collapse into a single master curve when the data is rescaled with instantaneous intensity, R(t; Mth), defined by MOF. The curve is approximated by a gamma distribution. The collapse of the data provides a clear view of aftershock-occurrence self-similarity.