Analyzing the temporal fluctuations of the reservoir-triggered seismicity observed at Açu (Brazil)

Telesca, Luciano; Nascimento, Aderson F. do; Bezerra, Francisco H.R.; Ferreira, Joaquim Mendes

doi:10.5194/nhess-12-805-2012

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…Thus, the hydraulic diffusivity along the Jiali Fault influences the speed of the evolution of seismic activity (see Hainzl, 2004 for more explanation). As proposed by Telesca et al (2012) in reservoir-triggered seismicity observed at Acu, Brazil, we also conclude that the processes of formation of fractures in the anisotropic and heterogeneous rockmass, along with pore pressure diffusion driven processes, are hypothesized as physical mechanisms for swarm generation in the study area.…”

Section: Whether Pore Pressure Is Responsible For Swarm Generation?mentioning

confidence: 76%

Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet: A seismotectonic appraisal

Mukhopadhyay¹,

Dasgupta²

2015

Geoscience Frontiers

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a b s t r a c tThe seismotectonic characteristics of ten repeated earthquake swarm sequence within a seismic cluster along Jiali Fault in eastern Himalayan Syntaxis (EHS) have been analysed. The swarms are spatially disposed in and around Yigong Lake (a natural lake formed by blocking of Yigong River by landslide) and are characterized by low magnitude, crustal events with low to moderate b values. Ms : mb discriminant functions though indicate anomalous nature of the earthquakes within swarm but are considered as natural events that occurred under condition of high apparent stress and stress gradients. Composite fault plane solutions of selected swarms indicate strikeeslip sense of shear on fault planes; solution parameters show low plunging compression and tensional axes along NWeSE and NEeSW respectively with causative fault plane oriented ENEeWSW, dipping steeply towards south or north. The fault plane is in excellent agreement with the disposition and tectonic movement registered by right lateral Jiali Fault. The process of pore pressure perturbation and resultant 'ret plot' with modelled diffusivity (D ¼ 0.12 m 2 / s) relates the diffusion of pore pressure to seismic sequence in a fractured poro-elastic fluid saturated medium at average crustal depth of 15e20 km. The low diffusivity depicts a highly fractured interconnected medium that is generated due to high stress activity near the eastern syntaxial bent of Himalaya. It is proposed that hydro fracturing with respect to periodic pore pressure variations is responsible for generation of swarms in the region. The fluid pressure generated due to shearing and infiltrations of surface water within dilated seismogenic fault (Jiali Fault) are causative factors.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Whether Pore Pressure Is Responsible For Swarm Generation?mentioning

confidence: 76%

Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet: A seismotectonic appraisal

Mukhopadhyay¹,

Dasgupta²

2015

Geoscience Frontiers

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“…Field observations and scientific research from the two last decades provide arguments that are in favor of reservoir-induced seismicity (Talwani, 1997;Peinke et al, 2006;Telesca, 2010Telesca, , 2011Telesca et al, 2012a). The strength of such reservoir-triggered earthquakes was found to be in the range from damaging earthquakes (Talwani, 1997) to micro-seismic emissions (Chander and Sarkar, 1993).…”

Section: Introductionmentioning

confidence: 99%

Relationship between seismicity and water level in the Enguri high dam area (Georgia) using the singular spectrum analysis

Telesca

Matcharasvili

Chélidzé

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. The declustered seismic catalog from 1965 to 2010 around the Enguri high dam reservoir in western Georgia was analyzed using the singular spectrum analysis (SSA) technique in order to investigate the relationship of local seismicity with the reservoir water variations. In particular, the seismic activity was analyzed in two periods: a "reference" period, from 1965 to 1970, before the start of dam building in 1971; and an "active" period, from 1978 to 2010, in which the influence of the reservoir was significantly effective on the seismic activity (since the first flooding of the dam occurred in 1978). The SSA was applied to both the monthly number of earthquakes and the time series of the monthly mean of the water level. The first four reconstructed components explained most of the total variance in both seismicity and water level. Clear signatures of the annual oscillation linked with the loading/unloading operations of the dam are present in the periodogram of the second and the third reconstructed components of the seismic activity during the "active" period. Such annual cycle is absent in the periodogram of the reconstructed components of the seismic activity during the "reference" period. This is a clear indication of the reservoir-induced character of the seismicity around the Enguri dam.

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“…(Snaebjörnsson, et al 2006;Sigtryggsdóttir et al 2013b) TM Reservoirs may trigger RTEs. (Gupta 2002;Telesca et al 2012;ICOLD 2011) Reservoir (Res) (Gráková et al, 2007) ) IW (Muço, 2013 Pandey and Chadha (2003), Mekkawi (2004), Gupta (2002) d Def is abbreviation for deformation Nat Hazards (2003) …”

Section: Appendixmentioning

confidence: 99%

“…Rajendran et al (2013),Telesca et al (2012), Ferreira et al (2008,Gahalaut et al (2007),Peinke et al (2006), Do,Lunn et al (2004),Gupta (2001) bItaba (2008),Chadha et al (2008),Singh et al (2008). Alarm potential(Reddy and Nagabhushanam 2011;Yuce et al 2010;Zhang et al 2013a) cGupta (2013),…”

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confidence: 96%

Methodology for geohazard assessment for hydropower projects

et al. 2015

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The paper presents a comprehensive methodology for a multihazard assessment, including an associated multihazard monitoring programme. An existing method in system theory is extended for multiple systems and used to demonstrate the importance of considering geohazard interrelations in the safety monitoring of reservoirs and dams. The method is applied to systems of geohazards and monitoring parameters. In both systems, there is a reservoir retained by one or more dams. Geohazards in hydropower project perspectives as well as monitoring opportunities are classified. The results are presented in a colour-coded matrix visually mapping ranked interrelations for the two systems. The methodology proposed provides a clear view on the prospective that individual geohazards may trigger other geohazards as well as on the geohazard-triggering potential of the reservoir itself. The warning potential of the possible monitoring parameters is also mapped and interrelated to the individual geohazards. The results demonstrate the importance of a comprehensive multidisciplinary monitoring programme for reliable operation and risk management of hydropower projects.

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Analyzing the temporal fluctuations of the reservoir-triggered seismicity observed at Açu (Brazil)

Cited by 10 publications

References 41 publications

Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet: A seismotectonic appraisal

Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet: A seismotectonic appraisal

Relationship between seismicity and water level in the Enguri high dam area (Georgia) using the singular spectrum analysis

Methodology for geohazard assessment for hydropower projects

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