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The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil

The main goal of this paper is to characterize the Coxim earthquake occurred in June 15th, 2009 in the Pantanal Basin and to discuss the relationship between its faulting mechanism with the Transbrasiliano Lineament. The earthquake had maximum intensity MM V causing damage in farm houses and was fel...

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Main Authors: Dias, Fábio L., Assumpção, Marcelo, Facincani, Edna M., França, George S., Assine, Mario L., Paranhos Filho, Antônio C., Gamarra, Roberto M.
Format: Artigo
Language: English
Published: Academia Brasileira de Ciências 2017
Subjects:
Bacias hidrográficas
Mecanização
Online Access: http://repositorio.unb.br/handle/10482/29987
http://dx.doi.org/10.1590/201620140507
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spelling ir-10482-299872019-03-28T14:09:51Z The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil Dias, Fábio L. Assumpção, Marcelo Facincani, Edna M. França, George S. Assine, Mario L. Paranhos Filho, Antônio C. Gamarra, Roberto M. Bacias hidrográficas Mecanização The main goal of this paper is to characterize the Coxim earthquake occurred in June 15th, 2009 in the Pantanal Basin and to discuss the relationship between its faulting mechanism with the Transbrasiliano Lineament. The earthquake had maximum intensity MM V causing damage in farm houses and was felt in several cities located around, including Campo Grande and Goiânia. The event had an mb 4.8 magnitude and depth was 6 km, i.e., it occurred in the upper crust, within the basement and 5 km below the Cenozoic sedimentary cover. The mechanism, a thrust fault mechanism with lateral motion, was obtained by P-wave first-motion polarities and confirmed by regional waveform modelling. The two nodal planes have orientations (strike/dip) of 300°/55° and 180°/55° and the orientation of the P-axis is approximately NE-SW. The results are similar to the Pantanal earthquake of 1964 with mb 5.4 and NE-SW compressional axis. Both events show that Pantanal Basin is a seismically active area, under compressional stress. The focal mechanism of the 1964 and 2009 events have no nodal plane that could be directly associated with the main SW-NE trending Transbrasiliano system indicating that a direct link of the Transbrasiliano with the seismicity in the Pantanal Basin is improbable. 2017-12-07T05:14:53Z 2017-12-07T05:14:53Z 2016-09 Artigo DIAS, FÁBIO L. et al. The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 88, n. 3, p. 1253-1264, set. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401253&lng=en&nrm=iso>. Acesso em: 16 mar. 2018. Epub Aug 25, 2016. doi: http://dx.doi.org/10.1590/201620140507. http://repositorio.unb.br/handle/10482/29987 http://dx.doi.org/10.1590/201620140507 en Acesso Aberto Anais da Academia Brasileira de Ciências - This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401253&lng=en&nrm=iso. Acesso em: 16 mar. 2018. application/pdf Academia Brasileira de Ciências
institution REPOSITORIO UNB
collection REPOSITORIO UNB
language English
topic Bacias hidrográficas
Mecanização
spellingShingle Bacias hidrográficas
Mecanização
Dias, Fábio L.
Assumpção, Marcelo
Facincani, Edna M.
França, George S.
Assine, Mario L.
Paranhos Filho, Antônio C.
Gamarra, Roberto M.
The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
description The main goal of this paper is to characterize the Coxim earthquake occurred in June 15th, 2009 in the Pantanal Basin and to discuss the relationship between its faulting mechanism with the Transbrasiliano Lineament. The earthquake had maximum intensity MM V causing damage in farm houses and was felt in several cities located around, including Campo Grande and Goiânia. The event had an mb 4.8 magnitude and depth was 6 km, i.e., it occurred in the upper crust, within the basement and 5 km below the Cenozoic sedimentary cover. The mechanism, a thrust fault mechanism with lateral motion, was obtained by P-wave first-motion polarities and confirmed by regional waveform modelling. The two nodal planes have orientations (strike/dip) of 300°/55° and 180°/55° and the orientation of the P-axis is approximately NE-SW. The results are similar to the Pantanal earthquake of 1964 with mb 5.4 and NE-SW compressional axis. Both events show that Pantanal Basin is a seismically active area, under compressional stress. The focal mechanism of the 1964 and 2009 events have no nodal plane that could be directly associated with the main SW-NE trending Transbrasiliano system indicating that a direct link of the Transbrasiliano with the seismicity in the Pantanal Basin is improbable.
format Artigo
author Dias, Fábio L.
Assumpção, Marcelo
Facincani, Edna M.
França, George S.
Assine, Mario L.
Paranhos Filho, Antônio C.
Gamarra, Roberto M.
author_sort Dias, Fábio L.
title The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
title_short The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
title_full The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
title_fullStr The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
title_full_unstemmed The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
title_sort 2009 earthquake, magnitude mb 4.8, in the pantanal wetlands, west-central brazil
publisher Academia Brasileira de Ciências
publishDate 2017
url http://repositorio.unb.br/handle/10482/29987
http://dx.doi.org/10.1590/201620140507
_version_ 1641988339102908416
score 13.657419

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