Coupling Between Seismic Activity and Hydrogeochemistry at the Shillong Plateau, Northeastern India

Skelton, Alasdair; Claesson, Lillemor; Chakrapani, G. J.; Mahanta, Chitralekha; Routh, Joyanto; Moörth, Magnus; Khanna, P. P.

doi:10.1007/978-3-7643-8738-9_4

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…A wide variety of changes in hydrogeochemistry have been correlated with seismic activity and have been reported (e.g. Tsunogai & Wakita 1995;Roeloffs & Quilty 1997;Sano et al 1998;Favara et al 2001;Kingsley et al 2001;Italiano et al 2004;Koizumi et al 2004;Skelton et al 2008;Wang & Manga 2010).…”

Section: Introductionmentioning

confidence: 99%

Stress‐induced temperature variations in groundwater of the Monferrato area (north‐western Italy)

Gregorio¹,

Federico²,

Cappuzzo³

et al. 2011

Geofluids

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Although characterized by low seismicity, the Monferrato area of north‐western Italy was affected by earthquakes, of magnitude M5.1 and M4.8, in 2000 and 2001. At the same time, marked changes were recorded in water temperature and chemistry in several wells within the epicentral area. In May 2004, an automatic network for the continuous monitoring of groundwater was installed in selected wells to study the phenomenon. Here, we report on data collected during a 3‐year period of groundwater monitoring. During the first year, episodes of water heating (by up to 20°C) were observed in one monitored well. The temporal analysis of the seismic activity recorded in the area revealed as almost all seismic events occurred during the period of elevated water temperatures. The similar timing of earthquakes and groundwater‐temperature anomalies suggests that both may be triggered by the same processes acting in the crust.

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Section: Introductionmentioning

confidence: 99%

Stress‐induced temperature variations in groundwater of the Monferrato area (north‐western Italy)

Gregorio¹,

Federico²,

Cappuzzo³

et al. 2011

Geofluids

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“…In addition, a correlation between a Na/K solute ratio anomaly and a significant (m b =5.5) contemporary earthquake has also been documented in northeast India (Skelton et al, 2008); however, the latter authors made no reference to any geothermometryrelated issues, invoking instead variable mixing between two chemically-distinct reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Persistent pre-seismic signature detected by means of Na-K-Mg geothermometry records in a saline spring of Vrancea area (Romania)

Mitrofan

Marin

Zugravescu

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract.A six year-long hydrochemical monitoring operation was conducted in Vrancea seismic zone (Romania), addressing a saline spring that proved to be suitable for Na-K-Mg geothermometry diagnosis. During the considered time-interval (2003)(2004)(2005)(2006)(2007)(2008)(2009), only one important earthquake (m b =5.8) occurred in Vrancea region, this circumstance providing an unambiguous reference-moment between preseismic and post-seismic periods. On occurrence of that earthquake, an anomalous fluctuation of the Na-K temperature was detected -a result largely similar to previous ones recorded worldwide (California, southwest Egypt, northeast India). Yet such fluctuations may not necessarily be induced by earthquake-associated processes: they can occur also "routinely", possibly reflecting some environmental, meteorologically-induced "noise". It was therefore important to examine whether the variations observed in the data values could be plausibly related to a seismogenesis process. By additionally investigating (in a "scattterplot" diagram) the correlation between the Na-K temperatures and the values of a so-called "maturity index", a specific pattern emerged, with pre-seismic data-points plotting in a distinct domain of the diagram; moreover, those data-points appeared to describe a "drift away" pathway with respect to the remaining data-points "cluster", recorded during the subsequent 4 years of post-seismic monitoring. The "drift away" pattern persistently evolved for at least 18 months, ending just before the m b =5.8 earthquake and consequently suggesting the existence of some kind of long-term precursory phenomenon.

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Coupling Between Seismic Activity and Hydrogeochemistry at the Shillong Plateau, Northeastern India

Cited by 2 publications

References 31 publications

Stress‐induced temperature variations in groundwater of the Monferrato area (north‐western Italy)

Stress‐induced temperature variations in groundwater of the Monferrato area (north‐western Italy)

Persistent pre-seismic signature detected by means of Na-K-Mg geothermometry records in a saline spring of Vrancea area (Romania)

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