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Geophys. J. Int. (2010) doi: 10.1111/j.1365-246X.2010.04554.x GJISeismology
 

Summary: Geophys. J. Int. (2010) doi: 10.1111/j.1365-246X.2010.04554.x
GJISeismology
The role of fluids in triggering earthquakes: observations
from reservoir induced seismicity in Brazil
Maya El Hariri,1 Rachel E. Abercrombie,1
Charlotte A. Rowe2
and Aderson F. do Nascimento3,4
1Boston University, Boston, MA 02478, USA. E-mail: mhariri@nmt.edu
2Los Alamos National Laboratory, Los Alamos, NM 87545, USA
3Universidade Federal do Rio Grande do Norte, Departamento de Geof´isica, Natal, RN 59072­970, Brazil
4INCT­GP. Instituto Nacional de Geof´isica do Petr´oleo (CNPq), Brazil
Accepted 2010 February 6. Received 2010 January 11; in original form 2009 September 28
S U M M A R Y
We relocate precisely micro-earthquakes induced by the Ac¸u reservoir in Brazil and observe
seismicity migration consistent with pore-pressure diffusion on a single fault zone. Fluids are
believed to play a major role in triggering tectonic earthquakes; reservoir induced seismic-
ity provides a natural laboratory in which to investigate the spatio-temporal evolution and
triggering of earthquakes caused by fluid and pore-pressure diffusion.
Between 1994 and 1997, 267 earthquakes (ML 2.1) were recorded and located beneath
the Ac¸u reservoir. The seismicity increased several months following annual water level peaks,

  

Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University

 

Collections: Geosciences