Coda Q in Eastern Indian shield

Khan, Prosanta Kumar; Bhukta, Kuntal; Tarafder, Gaurab

doi:10.1007/s40328-015-0129-1

Cited by 10 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 This method of using the coda Q decay envelope is called the coda wave decay (CWD) method and it is the most commonly used approach for determining coda Q, applied in many publications, both presently (e.g., Farrokhi et al, 2015;Khan et al, 2015;Singh et al, 2015) and for the last 30 years (e.g., Zelt et al, 1999;Bianco et al, 2002;Mak et al, 2004;Yun et al, 2007;Mukhopadhyay et al, 2008;Carcole and Sato, 2010;Rahimi et al, 2010;Calvet and Margerin, 2013). Gusev (1995) in his review article provides many references up to 1994.…”

Section: Introductionmentioning

confidence: 99%

CodaQin Different Tectonic Areas, Influence of Processing Parameters

Havskov¹,

Sørensen²,

Vales³

et al. 2016

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

Published results of coda Q show a large variation in values. These variations are often claimed to be related to different tectonics, whereas they might just be related to using different assumptions in the processing, leading to different input parameters for the analysis. In this study, the effect of using different processing parameters is investigated and significant differences, particularly at low frequencies, are observed. We find a new set of optimal parameters, which we recommend using in future studies. Using a short lapse time of 30 s and optimal parameters, data from both similar and very different tectonic regions are used to calculate coda Q using the same program and the same parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

CodaQin Different Tectonic Areas, Influence of Processing Parameters

Havskov¹,

Sørensen²,

Vales³

et al. 2016

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

show abstract

“…But only a few attempts have been made until today for a hazard-related study of this region. Attenuation characteristics form one of the essential parameters of seismic hazard studies, but few researchers have studied this parameter for EIC to date (Khan et al 2016). However, the lack of a sufficient number of seismic stations resulting in poor azimuthal coverage and bad quality seismic data constrain those earlier studies.…”

Section: Introductionmentioning

confidence: 99%

Estimation of coda Q for the eastern Indian craton

2019

View full text Add to dashboard Cite

We herein present new frequency-dependent coda-Q (Q c) relations (Q c = Q 0 f n) (frequency ranges between 2 and 18 Hz) for three regions of the eastern Indian craton (EIC), viz., the Singhbhum Odisha craton (SOC) and the Eastern Ghat mobile belt (EGMB), comprising the Mahanadi basin and the Chotanagpur granitic gneissic terrain (CGGT). The frequency-dependent coda-Q c relations are obtained through the single backscattering model for coda waves (Q c) of local earthquakes which are recorded on 15 three-component broadband seismograph stations in the regions. In this work, we pay special attention to test the lapse time (t L) dependency of coda-Q (Q c) estimates for the three regions. Lapse time signifies the sample area of the coda wave of the study region. Generally, the sample area increases with lapse time. To test the lapse time (t L) dependency, nine different lapse time windows (t L) from 10 to 90 s with 10 s interval are considered. On the ground of estimated poor correlation coefficients, only six lapse time windows (t L) from 40 to 90 s with 10 s interval are considered. Our results suggest more heterogeneity in EGMB than that of the SOC and CGGT region. Estimates of Q 0 and n for the three regions of EIC (SOC, EGMB and CGGT) are found to be consistent with the results of Q 0 and n for mildly active less heterogeneous seismic zones in different parts of the world. By assuming entirely intrinsic attenuation characteristics, actual hazard parameters, i.e., extinction distance and anelastic attenuation coefficients are also computed for the three regions. The extinction distance (L e) provides an idea of the distribution of scatterers in the lithosphere and anelastic attenuation coefficients signify the anelasticity of the medium, i.e., fluid movement and grain distribution. The estimate of extinction distance and attenuation coefficients suggests that for all three study regions, the upper mantle is relatively less heterogeneous and attenuation below 110-126 km depth is also comparatively lower. Coda Q indicates the degree of fracture and heterogeneity in the lithosphere related to seismicity. A higher estimate of Q 0 values in the Archaean SOC region and the Proterozoic CGGT region is found when compared with that of the sedimentary-rich EGMB. It can be inferred that seismically less active cratons in general comprise high Q 0 values, whereas the sedimentary-rich EGMB is more attenuative, characterised by a low coda Q 0 value. Moreover, it is found that the estimated Q 0 values for CGGT region are a little bit higher than that for the SOC region. This can be explained as a comparatively less disturbed and less heterogonous land mass that is present in the CGGT region as compared to the SOC region, which comprises different minerals, ore bodies, fault scarps and shear zones. The developed Q c relation for the EIC region could be useful for the study of hazards and ground motion prediction.

show abstract

“…2) and it bends southwards (Fig. 2) and enters in the Dalma volcanic zone (Khan, Bhukta & Tarafder 2016)(Chandil to Jamshedpur).…”

Section: Geological Set-up Of Upper Catchment Of Subarnarekhamentioning

confidence: 99%

Discussion on Hundru fall as a knick point, Iharkhand, India

Sinha¹

2021

Landsc. environ.

View full text Add to dashboard Cite

Subarnarekha River lies in the vicinity to the Ranchi mega lineament zone of Jharkhand State. This river links the Tamar Porapahar shear zone and North Singhbhum shear zone. The Hundru falls is the sudden and abrupt drop of elevation (longitudinal profile) of upstream of river Subarnarekha. The basic aim of this paper is to assess the Hundru falls as a perfect citation of an upstream knick point in Indian context. This paper covers the knick point formation of upstream of the Subarnarekha river. This upper catchment is more diversified in the terms of metamorphic and igneous rocks. This zone has crossed a long path with diversified lithospheric adjustment with epirogenic upliftment.

show abstract

Coda Q in Eastern Indian shield

Cited by 10 publications

References 50 publications

CodaQin Different Tectonic Areas, Influence of Processing Parameters

CodaQin Different Tectonic Areas, Influence of Processing Parameters

Estimation of coda Q for the eastern Indian craton

Discussion on Hundru fall as a knick point, Iharkhand, India

Contact Info

Product

Resources

About