Pronounced soil-radon anomaly—Precursor of recent earthquakes in India

Ghosh, Dipak; Deb, Argha; Sengupta, Ranjan; Patra, Kanchan Kumar; Bera, Sukumar

doi:10.1016/j.radmeas.2006.12.008

Cited by 36 publications

(15 citation statements)

References 22 publications

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“…They found positive as well as negative pre signals of radon anomalies. Ghosh et al (2007) have performed an experiment on measuring radon concentration in soil gas with the use of CR-39 (SSNTD) at Kolkata, India. Radon anomaly before the earthquakes that occurred during the period of November 2005 to October 2006 within the range of 1000 km from the measuring site and of M ≥ 4 was observed.…”

Section: Indiamentioning

confidence: 99%

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Anomalous radon emission as precursor of earthquake

Ghosh

Deb

Sengupta

2009

Journal of Applied Geophysics

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184

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Section: Indiamentioning

confidence: 99%

“…They used the diffusion equation of Ghosh (Ghosh and Seikh, 1976), Junge (1963) and empirical relations of Dobrovolsky (Dobrovolsky et al, 1979;Hauksson and Goddard, 1981) to get their relation as (symbols having their usual meaning) M = 2 logðλΔR = KTÞ−15:26…”

Section: Radon Anomaly and Earthquake: Some Modelsmentioning

confidence: 99%

Anomalous radon emission as precursor of earthquake

Ghosh

Deb

Sengupta

2009

Journal of Applied Geophysics

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184

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“…The radon anomalies are usually recognized by using +2σ method, in which the anomaly thresholds are calculated with mean value and two standard deviation (Ghosh et al 2007;Ramola et al 2008;Oh and Kim 2015). In this study, we use a residual signal processing technique, in order to: (1) identify the anomalies in time series and (2) diminish the regular effects from environmental factors for data recorded.…”

Section: Methodsmentioning

confidence: 99%

Preseismic anomalies in soil-gas radon associated with 2016 M 6.6 Meinong earthquake, Southern Taiwan

Fu¹,

Walia²,

Yang³

et al. 2017

Terr. Atmos. Ocean. Sci.

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Taiwan is tectonically situated in a terrain resulting from the oblique collision between the Philippine Sea plate and the continental margin of the Asiatic plate, with a continuous stress causing the density of strong-moderate earthquakes and regional active faults. The continuous time series of soil radon for earthquake studies have been recorded and some significant variations associated with strong earthquakes have been observed. Earthquake prediction is not still operative but these correlations should be added to the literature about seismo-geochemical transients associated to strong earthquakes. Rain-pore pressure related variations, crustal weakness at the studied faults system is consistent with the simultaneous radon anomalies observed. During the observations, a significant increase of soil radon concentrations was observed at Chunglun-T1 (CL-T1), Hsinhua (HH), Pingtung (PT), and Chihshan (CS) stations approximately two weeks before the Meinong earthquake (M L = 6.6, 6 February 2016) in Southern Taiwan. The precursory changes in a multi-stations array may reflect the preparation stage of a large earthquake. Precursory signals are observed simultaneously and it can apply certain algorithms the approximate location and magnitude of the impending earthquake.

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“…To define the mean and standard deviation, anomalously high and low values -which may cause unnecessary high deviation and perturb the real anomalies -have to be neglected. The periods when radon concentration deviates by more than ±2σ from the related seasonal value are considered as radon anomalies that are possibly caused by earthquake events and not by meteorological parameters (Ghosh et al, 2007;Gregorič et al, 2008;Virk et al, 2002;Zmazek et al, 2002b). Fig.…”

Section: Standard Deviationmentioning

confidence: 99%