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Reservoir‐Triggered Seismicity in Brazil: Statistical Characteristics in a Midplate Environment

2018; Seismological Society of America; Volume: 108; Issue: 5B Linguagem: Inglês

10.1785/0120170364

1943-3573

Lucas Vieira Barros, Marcelo Assumpção, L. C. Ribotta, Vinícius Martins Ferreira, J. Carvalho, Brigida M. D. Bowen, Diogo Farrapo Albuquerque,

Seismic Imaging and Inversion Techniques

Research Article| September 11, 2018 Reservoir‐Triggered Seismicity in Brazil: Statistical Characteristics in a Midplate Environment Lucas Vieira Barros; Lucas Vieira Barros aSeismological Observatory, University of Brasília, Campus Darcy Ribeiro – SG13, 70910‐900 Brasília, Brazil, lucas@unb.br Search for other works by this author on: GSW Google Scholar Marcelo Assumpção; Marcelo Assumpção bSeismology Center, IAG, University of São Paulo, Rua do Matão 1226, 05508‐090 São Paulo, Brazil, marcelo.assumpcao@iag.usp.br Search for other works by this author on: GSW Google Scholar Luis Carlos Ribotta; Luis Carlos Ribotta cInstitute of Technological Research (IPT), Av. Prof. Almeida Prado, 532 ‐ Butantã, CEP, 05508‐070 São Paulo, Brazil, ribotta@ipt.br Search for other works by this author on: GSW Google Scholar Vinicius M. Ferreira; Vinicius M. Ferreira aSeismological Observatory, University of Brasília, Campus Darcy Ribeiro – SG13, 70910‐900 Brasília, Brazil, lucas@unb.br Search for other works by this author on: GSW Google Scholar Juraci M. de Carvalho; Juraci M. de Carvalho aSeismological Observatory, University of Brasília, Campus Darcy Ribeiro – SG13, 70910‐900 Brasília, Brazil, lucas@unb.br Search for other works by this author on: GSW Google Scholar Brigida M. D. Bowen; Brigida M. D. Bowen aSeismological Observatory, University of Brasília, Campus Darcy Ribeiro – SG13, 70910‐900 Brasília, Brazil, lucas@unb.br Search for other works by this author on: GSW Google Scholar Diogo F. Albuquerque Diogo F. Albuquerque aSeismological Observatory, University of Brasília, Campus Darcy Ribeiro – SG13, 70910‐900 Brasília, Brazil, lucas@unb.br Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2018) 108 (5B): 3046–3061. https://doi.org/10.1785/0120170364 Article history first online: 11 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Lucas Vieira Barros, Marcelo Assumpção, Luis Carlos Ribotta, Vinicius M. Ferreira, Juraci M. de Carvalho, Brigida M. D. Bowen, Diogo F. Albuquerque; Reservoir‐Triggered Seismicity in Brazil: Statistical Characteristics in a Midplate Environment. Bulletin of the Seismological Society of America 2018;; 108 (5B): 3046–3061. doi: https://doi.org/10.1785/0120170364 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Reservoir‐triggered seismicity (RTS) was first reported in Brazil in the early 1970s. Here, we update the compilation of Assumpção et al. (2002), increasing the number of RTS from 16 to 26 cases. We briefly describe eight new cases that had been published in congress proceedings. We compare this updated RTS database with all Brazilian dams taller than 20 m. The reservoirs that triggered earthquakes were analyzed in relation to dam height, reservoir volume, geology, seismicity level, and stress provinces. The chance of a reservoir‐triggering seismicity clearly increases with dam height, as is well known: the chance is only 2% for heights between 20 and 50 m in Brazil, increases to 8% between 50 and 100 m, and reaches 65% for dams taller than 100 m. The reservoir volume also has a clear influence: 26% of the reservoirs with volumes between 1.0 and 10 km3 triggered earthquakes, and the chance increases to 47% for volumes larger than 10 km3⁠. No clear correlation with the geology was found. Dams built on igneous rocks tend to be slightly more prone to RTS, compared with those built on sedimentary rocks, but the difference is not statistically significant. No difference was found among the three main types of geological provinces (cratonic basement, Neoproterozoic fold belts, and intracratonic Phanerozoic basins). A tentative comparison with the yet poorly defined stress provinces in Brazil did not show any difference between regions of compressional stresses and regions with shear stresses. On the other hand, comparison of the fraction of reservoirs producing RTS in natural seismic and aseismic areas showed that regions with natural seismicity have twice as much potential for RTS than aseismic regions. Although dam height is the most influential characteristics, the maximum magnitude does not show any clear correlation with dam height or reservoir size, similar to other cases worldwide. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.