Reservoir-induced Seismicity in Brazil

Assumpção, M.; Mârza, Vasile; Barros, Lucas Vieira; Chimpliganond, Cristiano Naibert; Soares, Joelson Lima; Carvalho, J.; Caixeta, Daniel; Teixeira, Alexandre de Amorim; Cabral, E.

doi:10.1007/978-3-0348-8179-1_25

Cited by 18 publications

(27 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The most recent inventories of seismic instability in Brazil indicate that the Itaipu reservoir has not induced any earthquake in the region (Gupta, 2002;Assunção et al, 2002). On the other hand the formation of Itaipu Lake has considerably modified the landscape in the area.…”

Section: Introductionmentioning

confidence: 97%

On the Climate Impact of the Local Circulation in the Itaipu Lake Area

2005

View full text Add to dashboard Cite

The impact of the Itaipu Lake on the climate and local circulation is investigated here using the meteorological information available in the area. The Itaipu Lake is an artificial water reservoir of 1460 km 2 (approximately 170 km by 7.5 km), formed in 1982 as part of the Itaipu Power Plant. It is situated on the Brazil-Paraguay frontier, in the central portion of Parana River Valley. The analysis of the available meteorological data (air and water temperatures, air relative humidity, precipitation and radiosonde soundings) provides observational evidences supporting the hypothesis that the Itaipu Lake presence has an important impact in the local circulation, inducing a local circulation with lake breeze characteristics showing horizontal wind divergence over the lake during daytime and convergence during nighttime. From the regional point of view, the Itaipu Lake formation has reduced the thermal amplitude of the diurnal air temperature cycle. The precipitation data, investigated here, has not indicated any systematic effect associated to the lake formation. The reason for the apparent inconsistency is that others phenomena (e.g., valley-mountain circulation and El Niño events) could be masking the impact of the lake formation on the rain deficit in the region.

show abstract

Section: Introductionmentioning

confidence: 97%

On the Climate Impact of the Local Circulation in the Itaipu Lake Area

2005

View full text Add to dashboard Cite

show abstract

“…Generally, the scientific and practical importance of investigation of possible mechanisms related to the dynamics of influence of high dam water reservoirs on local earthquakes generation is well acknowledged [1,15,22,23,25,26]. Since the mid of the past century, the RIS has been observed at many reservoirs and their geological, hydrological, and physical features remain subjects of intense investigation.…”

Section: Introductionmentioning

confidence: 99%

“…At present, many aspects of dynamics of RIS become understandable [1,26]. Namely, the increase of seismic activity is related to the complex impact of the water lake on the earth crust under the reservoir and is explained by the changes in ambient stress conditions due to the load (unload) of the water or, respectively, to the increase of interstitial pore pressure in the rock matrix beneath the reservoir due to downward percolation of fluid.…”

Section: Introductionmentioning

confidence: 99%

Increase of order in seismic processes around large reservoir induced by water level periodic variation

2007

View full text Add to dashboard Cite

The importance of small periodic influences on the complex systems behavior is well acknowledged. In the present research, the possible impact of water level variation in large reservoir on the dynamics of local seismic activity was investigated. Large reservoirs located in the seismically active zones are often considered as a factor, quantitatively and qualitatively influencing earthquakes generation. During impoundment or after it, both the number and magnitude of earthquakes around reservoir significantly increases. After several years, these changes in earthquake generation, named as reservoir-induced seismicity (RIS) essentially decrease down to the level, when lesser earthquakes occur with lower magnitudes. To explain this decrease, the authors of the present paper recently proposed the model of phase synchronization of local seismic activity by the periodic variation of the water level -reservoir-induced synchronization of seismicity (RISS).Generally, RISS presumes a kind of control of local seismic activity by synchronizing small external periodic influence and hence increase of order in dynamics of regional seismic activity. To reveal these changes T. Matcharashvili ( ) · T. Chelidze in dynamics of phase-synchronized seismic activity around large reservoir field, seismic and water level variation data were analyzed in the present work. Laboratory stick-slip acoustic emission data as a model of natural seismicity were also analyzed.The evidence is presented that increase of order in dynamics of daily earthquake occurrence, earthquakes temporal, and energy distribution took place around Enguri high dam water reservoir (Western Georgia) during the periodic variation of the water level in the lake.

show abstract

“…Around the town of Redenção two events with m b 4.7 and 4.2 occurred in December 1980 and November 2010, respectively, the first with a normal-fault focal mechanism and a general N-S direction of extension (Assumpção et al, 1985). A set of induced earthquakes occurred between November 1985 and March 1988 after the impoundment of the Tucuruí reservoir, the larger with m b 3.6, but no focal mechanisms were obtained for these events (Assumpção et al, 2001). The epicenters are concentrated around the dam and roughly distributed along a N-Strending Precambrian reverse fault (Tocantins-Araguaia Lineament).…”

Section: Study Areamentioning

confidence: 96%

Regional scale analysis of landform configuration with base-level (isobase) maps

Grohmann¹,

Riccomini²,

Chamani³

2011

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Base-level maps (or "isobase maps", as originally defined by Filosofov, 1960), express a relationship between valley order and topography. The base-level map can be seen as a "simplified" version of the original topographic surface, from which the "noise" of the low-order stream erosion was removed. This method is able to identify areas with possible tectonic influence even within lithologically uniform domains. Base-level maps have been recently applied in semi-detail scale (e.g., 1:50 000 or larger) morphotectonic analysis. In this paper, we present an evaluation of the method's applicability in regional-scale analysis (e.g., 1:250 000 or smaller). A test area was selected in northern Brazil, at the lower course of the Araguaia and Tocantins rivers. The drainage network extracted from SRTM30 PLUS DEMs with spatial resolution of approximately 900 m was visually compared with available topographic maps and considered to be compatible with a 1:1,000 000 scale. Regarding the interpretation of regional-scale morphostructures, the map constructed with 2nd and 3rd-order valleys was considered to present the best results. Some of the interpreted base-level anomalies correspond to important shear zones and geological contacts present in the 1:5 000 000 Geological Map of South America. Others have no correspondence with mapped Precambrian structures and are considered to represent younger, probably neotectonic, features. A strong E-W orientation of the base-level lines over the inflexion of the Araguaia and Tocantins rivers, suggest a major drainage capture. A N-S topographic swath profile over the Tocantins and Araguaia rivers reveals a topographic pattern which, allied with seismic data showing a roughly N-S direction of extension in the area, lead us to interpret this lineament as an E-W, southward-dipping normal fault. There is also a good visual correspondence between the base-level lineaments and Correspondence to: C. H. Grohmann (guano@usp.br) geophysical anomalies. A NW-SE lineament in the southeast of the study area partially corresponds to the northern border of the Mosquito lava field, of Jurassic age, and a NW-SE lineament traced in the northeastern sector of the study area can be interpreted as the Picos-Santa Inês lineament, identifiable in geophysical maps but with little expression in hypsometric or topographic maps.

show abstract

Reservoir-induced Seismicity in Brazil

Cited by 18 publications

References 22 publications

On the Climate Impact of the Local Circulation in the Itaipu Lake Area

On the Climate Impact of the Local Circulation in the Itaipu Lake Area

Increase of order in seismic processes around large reservoir induced by water level periodic variation

Regional scale analysis of landform configuration with base-level (isobase) maps

Contact Info

Product

Resources

About