The Athens 1999 mainshock (Mw=5.9)and the evolution of its aftershock sequence

Papazachos, C. B.; Καρακώστας, Β. Γ.; Karakaisis, G. F.; Papaioannou, Ch.

doi:10.12681/bgsg.17266

Cited by 9 publications

(12 citation statements)

References 6 publications

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“…This model is adopted for the simulation of seismic events of magnitude M Ͼ 5.4. For the finite-source model, the parameters of seismic fault as determined by Harvard and by Papazachos et al (2001) were used. The input parameters of both stochastic (point and finite) source models, which have been derived by Margaris and Boore (1998) and Margaris (2000), are adopted.…”

Section: Stochastic Finite-source Model (Fsm) Techniquementioning

confidence: 99%

Analytical Estimation of Economic Loss for Buildings in the Area Struck by the 1999 Athens Earthquake and Comparison with Statistical Repair Costs

et al. 2007

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Reliable loss assessment (in monetary terms) for buildings struck by an earthquake is an essential factor in the development of seismic risk scenarios for a given urban area. The evaluation of loss due to building damage in a certain region depends both on seismic hazard and the vulnerability of the building stock in the area. The study presented herein consists of predicting the loss to selected groups of buildings struck by the 1999 Athens earthquake using an analytical methodology and comparison with statistical repair costs collected after the earthquake. Since no near-field strong ground motion recordings from the main shock were available, a pilot methodology was used for its analytical evaluation for different soil conditions. Different suites of motions were derived, based on various theoretical and semi-empirical approaches, and were then used in analytical investigations of the seismic behavior of the buildings in the examined area, aiming at the prediction of economic losses. An in-situ survey of about 10% of the total building stock was performed, and data regarding the structural type, actual earthquake damage, and corresponding repair costs were collected. The statistically derived repair cost for the area was compared with the economic loss estimation obtained using the analytical procedure and various estimates of the seismic action in the area considered, and was found to agree with it reasonably for some of the seismic hazard scenarios.

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Section: Stochastic Finite-source Model (Fsm) Techniquementioning

confidence: 99%

Analytical Estimation of Economic Loss for Buildings in the Area Struck by the 1999 Athens Earthquake and Comparison with Statistical Repair Costs

et al. 2007

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“…1). Among these two structures, the Fili fault is most likely related to the 1999 earthquake (Ganas et al, 2001;Pavlides et al, 2002), although the rupture did not reach the surface (Papazachos et al, 2001;Baumont et al, 2002;Roumelioti et al, 2003b) and, therefore, any conclusions regarding the causative fault are doubtful.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Strong Ground-Motion Simulation of the 7 September 1999 Athens (Greece) Earthquake

Roumelioti¹

2004

Bulletin of the Seismological Society of America

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The stochastic method for finite faults is applied to simulate strong ground motion from the 7 September 1999, moment magnitude M 5.9 Athens earthquake. The method includes descritization of the fault plane into a certain number of subfaults, each of which is assigned an x ‫2מ‬ spectrum. A slip-distribution model, derived from previous studies of this earthquake, is used to specifically account for the source effect. Contributions from all subfaults are then empirically attenuated to the observation sites, where they are summed to produce the synthetic acceleration time history. The method is first calibrated against its ability of reproducing the recordings at 19 strong-motion stations, at epicentral distances ranging from 16 to 61 km. The calibrated model is then applied to calculate synthetics at a large number of grid points covering the area around the fault plane. Simulated peak values are subsequently used to produce synthetic peak ground acceleration and spectral acceleration maps at hard rock. Both peak ground acceleration and spectral acceleration maps imply energy directivity toward the east, where most of the damage was concentrated. The directivity effect is most prominent at large periods (Ͼ2 sec) and in the period range 0.2 to 0.3 sec. Independent geotechnical studies showed considerable site effect at periods Ͻ0.5 sec within the meizoseismal area. This result, coupled with the results of the present study, imply that the damage distribution pattern of the 1999 Athens earthquake can be explained by the destructive combination of two factors: the source directivity and the site effect.

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“…A tabela 8.1 é uma versão atualizada do seu trabalho. Papazachos (1971), descobriu a relação para sequências de SDR, com desvio padrão de 0,3:…”

Section: Relação Entre a Magnitude Do Maior Pós-abalo E Magnitude Do unclassified

“…A relação do Papazachos (1971) difere significativamente da que foi dada por Båth (1965) para terremotos rasos, grandes e normais.…”

Section: Relação Entre a Magnitude Do Maior Pós-abalo E Magnitude Do unclassified

Estudo da sismicidade natural de Angola e desencadeada no Médio Kwanza

Neto¹,

Antônio²

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O objetivo do presente trabalho é estudar e documentar a sismicidade natural em toda Angola, e criar o primeiro banco de dados sísmico que facilite a consulta e busca de informação sobre atividade sísmica no País, e Desencadeada na região do médio Kwanza. O estudo foi realizado com base em consulta a relatórios produzidos pelo Instituto Nacional de Meteorologia e Geofísica (INAMET) de 1968-2014, a partir de dados macrossísmicos, com maior ênfase ao trabalho apresentado por Moreira (1968); análise de relatórios técnicos sobre a sismicidade da região do médio Kwanza elaborados pela Hidroproject (2007); consulta aos boletins sísmicos internacionais do International Seismological Centre (ISC), e ao United States Geological Survey (USGS), dados com localização instrumental dos epicentros; bem como processamento de dois eventos registrados pela rede sismográfica de Capanda (um local de 23/07/2013, processado no âmbito da sismicidade desencadeada por reservatório e outro regional de 19/11/2013, processado no âmbito da sismicidade natural). Toda essa informação foi cruzada com dados geológicos, tectônicos, Imagens de Satélite Landsat-8 e Modelo Digital de Elevação SRTM3, que se constituiu no banco de dados que possibilitou a elaboração do mapa de Sismicidade de Angola, combinando magnitude estimada a partir de dados macrossísmicos com magnitude instrumental. Como resultado esperado, foram reconfirmadas as zonas sísmicas definidas por Moreira (1968), associadas às regiões dos escudos e a bacias intracratônicas, e, como contribuição a definição de uma nova zona na margem passiva. Foi feita uma tentativa de associar a sismicidade dessas regiões com os modelos de sismicidade intraplaca propostos por vários autores (concentração de esforços; zona de fraqueza pré-existente; alto fluxo de calor e ainda a hidrossismicidade), a partir de estruturas geológicas existentes nas respetivas regiões. Na região do médio Kwanza, apesar de não haver dados suficientes para afirmar se os terremotos registrados próximo do reservatório de Capanda foram ou não desencadeados, interpretação de mapas geológico, tectônico e dos produtos de sensoriamento remoto, revelaram a existência de zonas de fraqueza, fraturas e falhas com orientação preferencial NW-SE, em torno ou nas áreas dos futuros reservatórios, criando assim condições para que a região venha a registrar terremotos desencadeados, uma vez que a mesma não pode ser considerada inativa.

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The Athens 1999 mainshock (Mw=5.9)and the evolution of its aftershock sequence

Cited by 9 publications

References 6 publications

Analytical Estimation of Economic Loss for Buildings in the Area Struck by the 1999 Athens Earthquake and Comparison with Statistical Repair Costs

Analytical Estimation of Economic Loss for Buildings in the Area Struck by the 1999 Athens Earthquake and Comparison with Statistical Repair Costs

Stochastic Strong Ground-Motion Simulation of the 7 September 1999 Athens (Greece) Earthquake

Estudo da sismicidade natural de Angola e desencadeada no Médio Kwanza

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