Evaluating Centroid-Moment-Tensor Uncertainty in the New Version of ISOLA Software

Sokos, Efthimios; Zahradnı́k, Jiřı́

doi:10.1785/0220130002

Cited by 169 publications

(69 citation statements)

References 24 publications

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“…ISOLA code (Sokos and Zahradník, 2013) is used for inverting regional full-wave seismograms for single-and multiple-point source models. The point source contributions are called subevents, representing points of moment release at different times with associated moment tensors.…”

Section: Methodsmentioning

confidence: 99%

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

Bollini

Sabbione

Plicka

et al. 2018

Journal of South American Earth Sciences

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Section: Methodsmentioning

confidence: 99%

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

Bollini

Sabbione

Plicka

et al. 2018

Journal of South American Earth Sciences

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“…Para desenvolver essas etapas, é preciso anteriormente processar o sinal sísmico, de forma a atenuar sua complexidade para tornar a modelagem mais realista e possível, tendo em vista a dificuldade de modelar sinais com fases de alta frequência (Sokos & Zahradník 2013).…”

Section: Materiais E Métodosunclassified

Influência de estruturas brasilianas na sismicidade desencadeada por reservatório na Usina Hidrelétrica de Irapé, Minas Gerais, Brasil

Silva¹,

Filho²,

Huelsen³

et al. 2014

Braz. J. Geol.

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RESUMO:Inaugurada em 2006, a Usina Hidrelétrica de Irapé possui a mais alta barragem do país, com 210 m, que vem sendo monitorada pelo Observatório Sismológico da Universidade de Brasília desde o começo do enchimento de seu reservatório. Apresentando sismicidade causada pelo aumento da tensão crustal logo após o início do represamento, a Sismicidade Desencadeada por Reservatório da Usina Hidrelétrica de Irapé permanece como um importante objeto de estudo para o entendimento deste fenômeno. O presente trabalho se propôs a estudar a sismicidade registrada de janeiro a maio de 2006, assim como a caracterizar a geologia ao redor da Usina Hidrelétrica de Irapé com o intuito de identificar e descrever as estruturas que permitam melhor compreender os eventos sísmicos. A orientação espacial dos eventos sísmicos obtidos pela análise das polaridades e da forma de onda condiz com aquelas dos lineamentos de relevo. As estruturas encontradas podem ser associadas a uma maior, de direção principal NE/SW, com dezenas de quilômetros, que seria responsável pela captura dos rios Jequitinhonha e Araçuaí, interpretada neste trabalho como uma estrutura relacionada a uma fase tardia do Evento Brasiliano. O diagrama de solução do mecanismo focal gerado utilizando um método de inversão da forma de onda no domínio do tempo indica que a direção dos possíveis planos de falhas está correlacionada ao principal direcionamento das estruturas rúpteis na área de trabalho. PALAVRAS-CHAVE: reativação sísmica de estruturas geológicas; estudos de sismicidade desencadeada por reservatório; Usina Hidrelétrica de Irapé.ABSTRACT: Inaugurated in 2006, the Irapé Hydroelectric Plant has the highest dam in Brazil, with 210 m. The Seismological Observatory of the University of Brasilia is monitoring this structure since the beginning of its reservoir filling. The reservoir triggered seismicity caused by the increase of crustal tension just after the start of the remains like an important object of study for understanding this phenomenon. This paper aims at studying the seismicity recorded from January to May 2006, as well as to characterize the geology around the Hydroelectric Plant Irapé in order to identify and describe the structures that help for better understanding the seismic events. The spatial orientation of the seismic events obtained by analyzing polarity and waveform is consistent with the guidance of prominent relief lineaments. These faults can be found attached to a larger structure with main NE/SW direction and tens of kilometers, which would be responsible for capturing Jequitinhonha and Araçuaí rivers. This great lineament is interpreted herein as a structure related to a late stage of the Brasiliano-Panafrican event. The solution of focal mechanism, created using an inversion method of the waveform in the time domain, indicates that the direction of the possible plans are correlated to main failure of brittle structures targeting the area of work.

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“…Our analysis is based on the methods proposed by Zahradník and Custódio (2012) and Sokos and Zahradník (2013). We present two different studies: (1) we compute maps of theoretical focal mechanism resolution for the Irpinia region and (2) we study the reliability of the solutions obtained from waveform inversion of five regional earthquakes.…”

mentioning

confidence: 99%

Moment Tensor Resolution: Case Study of the Irpinia Seismic Network, Southern Italy

Michele¹,

Custódio²,

Emolo³

2014

Bulletin of the Seismological Society of America

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We present an analysis of the reliability of focal mechanisms obtained through moment tensor inversion at the Irpinia Seismic Network, southern Italy. Our analysis is based on the methods proposed by Zahradník and Custódio (2012) and Sokos and Zahradník (2013). We present two different studies: (1) we compute maps of theoretical focal mechanism resolution for the Irpinia region and (2) we study the reliability of the solutions obtained from waveform inversion of five regional earthquakes. Theoretically, we find that when data error is the dominant source of error, focal mechanism resolution is better close to the spots of higher station density rather than at the center of the network. Using real data, we were able to successfully study four of the five regional events, in spite of the large source-station distances (up to ∼280 km) and significant azimuthal gaps (> 319°). We used variance reduction, double-couple percentage, signal-to-noise ratio, condition number, and focal mechanism variability index to assess the quality of the solutions. Our quality assessment is validated by comparison with independent focal mechanism solutions.

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Evaluating Centroid-Moment-Tensor Uncertainty in the New Version of ISOLA Software

Cited by 169 publications

References 24 publications

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

Influência de estruturas brasilianas na sismicidade desencadeada por reservatório na Usina Hidrelétrica de Irapé, Minas Gerais, Brasil

Moment Tensor Resolution: Case Study of the Irpinia Seismic Network, Southern Italy

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