Seismic evidence of crustal heterogeneity beneath the northwestern Deccan volcanic province of India from joint inversion of Rayleigh wave dispersion measurements and P receiver functions

Deshpande, A.A.; Gurusamy, Mohan

doi:10.1016/j.jseaes.2016.07.022

Cited by 8 publications

(5 citation statements)

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“…A continuous LVZ is also recognized beneath the lid with an average Vs of 4.38 km/s. Deshpande and Mohan () also reported a LVL (Vs ~4.35–4.5 km/s) just beneath the Moho (38 km), down to 55 km, contradictory to the present estimates of a high‐velocity lid. This may be due to the fact that their results are limited to 55 km depth in the absence of long‐period surface wave data and represent the characteristic of the whole path traversed between the source and receiver.…”

Section: Shear Wave Velocity Modelscontrasting

confidence: 99%

“…This high‐velocity basalt layer rests on another high‐velocity layer of V S 3.1 ± 0.04 to 3.3 ± 0.07 km/s, which can be representative of Mesozoic sediments (Figure ). Results from joint inversion of P wave receiver functions and surface waves reveal a top basaltic and/or subbasaltic sedimentary layer having an average Vs of 2.85 km/s and a thickness of 2.7 km (Deshpande & Mohan, ). Also, Chopra et al () estimated the top layer thickness between 0.8 and 1.4 km, underlain by another high‐velocity layer where the value of V S varies between 2.9 and 3.2 km/s.…”

Section: Shear Wave Velocity Modelsmentioning

confidence: 99%

“…Similarly, Prajapati et al () estimated the 1‐D crustal structure across the central and southern DVP using surface wave dispersion data and reported a thicker lower crust (21.0 km) with a crustal thickness of 37.8 km, in comparison to that in the Indian Peninsula (18.3 km) with a crustal thickness of 38.7 km (IP12 model of Bhattacharya, ). Through a joint modelling of P ‐receiver functions and Rayleigh wave dispersion, Deshpande and Mohan () evaluated the structure of crust and uppermost mantle down to 55 km depth beneath Saurashtra and Western Ghats. The high shear velocities (3.8–4.2 km/s) and Poisson's ratios (~0.286) in the lower crust were shown as evidence for magmatic underplating.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Imprints of Plume‐Lithosphere Interaction Beneath the Northwestern Deccan Volcanic Province

et al. 2018

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The interaction of the Indian continental lithosphere with the Reunion plume resulted in massive outpouring of basalts manifested in the Deccan Volcanic Province. Although it is postulated that preexisting weak rift zones facilitated the eruption, deeper signatures of the plume remain contentious. In this study, we investigate the shear wave velocity (Vs) structure of the crust and upper mantle by inverting regionalized group velocity dispersion data in the period range of 6 to 100 s, down to 220 km depth, using the genetic algorithm technique. We used 1,286 dispersion curves derived from waveforms of 77 regional earthquakes recorded at 38 broadband stations. Our results reveal distinct intracrustal layers, Moho, mantle lid, and asthenospheric low‐velocity layer. Signatures of magmatic underplating are recognized in terms of high Vs and a thick crust beneath the Kutch seismic zone and Western Ghats. The lithospheric thickness varies from 80 to 124 km, being thinnest at the junction of Cambay and Narmada rifts, which could be the source zone of volcanic eruption. A thin lithosphere has also been observed beneath the Kutch seismic zone. A low‐velocity zone at depths ~80 km can be related with upwarping of the asthenosphere and/or presence of partial melts. A predominant low‐velocity zone beneath the Cambay, Saurashtra, and adjoining regions may be due to the effect of a residual thermal anomaly. A thin lithosphere beneath northwestern Deccan Volcanic Province could be the result of weakening due to plume‐lithosphere interaction, which facilitated volcanism through preexisting rift zones.

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Section: Shear Wave Velocity Modelscontrasting

confidence: 99%

Section: Shear Wave Velocity Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Imprints of Plume‐Lithosphere Interaction Beneath the Northwestern Deccan Volcanic Province

et al. 2018

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“…P-receiver functions are primarily sensitive to shear wave velocity contrasts in layered structures while Rayleigh wave group velocity dispersion curves are sensitive to averaged shear wave velocities (Agrawal et al, 2015b). Combining the average Rayleigh wave dispersion curve and P-receiver functions stacks can effectively overcome the resolution gap associated with individual data sets (Desphande and Mohan, 2016). In this section, the results of joint inversion were interpreted in the northeast-southwest direction, and results were compared with previous studies.…”

Section: Resultsmentioning

confidence: 99%

P-Alıcı Fonksiyonları ve Rayleigh Dalgası Grup Hızları’nın Birleşik Ters Çözümü’nden Doğu Anadolu Fay Zonu’nun Kabuk ve Üst Manto Hız Yapısı

Alkan¹

2021

European Journal of Science and Technology

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The East Anatolian Fault Zone (EAFZ) is an active plate boundary where an intense earthquake activity has occurred from past to present. This activity is highly related to the geodynamic structure of the region. Because of the northward motion of Arabian plate and southward motion of the Eurasian plate, the Anatolian plate has attempted to escape westward with anticlockwise rotation. This tectonic movement cause the development of important tectonic structures. In relation to these active plate motions, the S-wave velocity structure of the EAFZ intersecting the North Anatolian Fault Zone (NAFZ) in the northeast and the Dead Sea Fault Zone (DSFZ) in the southwest is very important in interpretation the tectonic structure of the region. In this study, it was applied on the joint inversion technique of P-wave receiver functions and Rayleigh wave group velocities by using the data collected from eight broadband stations along the EAFZ. The P-receiver functions were obtained by using approximately eighty teleseismic events seperately for each station, recorded by the three-component broadband seismometers. On the other hand, for the Rayleigh wave group velocity dispersion curves, twenty-one local earthquakes which have focal depth less than 50 km and bigger than moment magnitude Mw=5.0 were used. The results obtained from these two techniques for each station was jointly inverted to determine the 1-D S-wave velocity structure of crust and uppermost mantle. S-wave velocity models along the EAFZ indicate the presence of the low-velocity layers in the upper crust, within the approximately depths of 4-12 km. However, the Conrad discontinuity along the seismic stations was around a depth of ~22 km. Furthermore, the crust-mantle boundary along the EAFZ is about ~44 km depth. Consequently, this study yields the crustal and uppermost mantle S-wave velocity structure compatible with the tectonics of the studied region.

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“…Location of the Jabalpur earthquake is shown as a star (Kumar et al, 2015)which triggers crustal earthquakes with uninterrupted aftershocks in the Kachchh rift zone. The crustal Poisson's ratio of 0.271 with lower shear velocities ranging from 3.8 km/s to 4.19 km/s in the lower crustal layers in Saurashtra and Cambay are interpreted as an effect of magmatic underplating due to emplacement of mafic cumulates in the lower crust(Deshpande and Mohan 2016).…”

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confidence: 98%

A review of seismological research in India during the past five years (2015-2019)

Srijayanthi¹,

Kumar²,

Gahalaut³

2020

PINSA

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Seismic evidence of crustal heterogeneity beneath the northwestern Deccan volcanic province of India from joint inversion of Rayleigh wave dispersion measurements and P receiver functions

Cited by 8 publications

References 36 publications

Seismic Imprints of Plume‐Lithosphere Interaction Beneath the Northwestern Deccan Volcanic Province

Seismic Imprints of Plume‐Lithosphere Interaction Beneath the Northwestern Deccan Volcanic Province

P-Alıcı Fonksiyonları ve Rayleigh Dalgası Grup Hızları’nın Birleşik Ters Çözümü’nden Doğu Anadolu Fay Zonu’nun Kabuk ve Üst Manto Hız Yapısı

A review of seismological research in India during the past five years (2015-2019)

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