Interpretation of first arrival travel times in seismic refraction work

Sain, Kalachand; Kaila, K. L.

doi:10.1007/bf00876443

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…2b) lying within a distance of 150 km from the northwest end of the profile are divided into three segments corresponding to three layers. Using the method of Sain & Kaila (1996), an initial model for 2‐D inversion is then derived based on the change in slopes of the traveltime curves. The refracted arrivals from the third layer are not observed from shot points lying beyond 150 km distance in the southeast part of the profile.…”

Section: Discussionmentioning

confidence: 99%

Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Sain

Bruguier

Murty

et al. 2000

Geophysical Journal International

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In order to investigate the velocity structure, and hence shed light on the related tectonics, across the Narmada–Son lineament, traveltimes of wide‐angle seismic data along the 240 km long Hirapur–Mandla profile in central India have been inverted. A blocky, laterally heterogeneous, three‐layer velocity model down to a depth of 10 km has been derived. The first layer shows a maximum thickness of the upper Vindhyans (4.5 km s−1 ) of about 1.35 km and rests on top of normal crystalline basement, represented by the 5.9 km s−1 velocity layer. The anomalous feature of the study is the absence of normal granitic basement in the great Vindhyan Graben, where lower Vindhyan sediments (5.3 km s−1 ) were deposited during the Precambrian on high‐velocity (6.3 km s−1 ) metamorphic rock. The block beneath the Narmada–Son lineament represents a horst feature in which high‐velocity (6.5 km s−1 ) lower crustal material has risen to a depth of less than 2 km. South of the lineament, the Deccan Traps were deposited on normal basement during the upper Cretaceous period and attained a maximum thickness of about 800 m.

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Section: Discussionmentioning

confidence: 99%

Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Sain

Bruguier

Murty

et al. 2000

Geophysical Journal International

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show abstract

“…The modeling approach is one of 'layer stripping', whereby successively deeper layers are determined by keeping fixed the velocity and structural information of overlying layers. Initially, the 1-D velocity-depth functions were derived separately for each shot point using the method of Sain and Kaila (1996). An initial 2-D velocity structure was then prepared along the profile by smoothly joining the individual shot point results for further refinement.…”

Section: Modeling Proceduresmentioning

confidence: 99%

Basement configuration of the Jhagadia–Rajpipla profile in the western part of Deccan syneclise, India from travel-time inversion of seismic refraction and wide-angle reflection data

Murty

Rao

Dixit

et al. 2011

Journal of Asian Earth Sciences

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“…The modeling approach is one of 'layer stripping', whereby successively deeper layers are determined by keeping fixed, the overlying velocity and structural information of the layers. Initially, the 1-D velocity-depth functions were derived separately for each shot point using the method of SAIN and KAILA (1996). An initial 2-D velocity structure was then prepared along the two profiles by smoothly joining the individual shot point results for further refinement.…”

Section: Modeling Proceduresmentioning

confidence: 99%

Delineation of Subtrappean Mesozoic Sediments in Deccan Syneclise, India, Using Travel-Time Inversion of Seismic Refraction and Wide-Angle Reflection Data

Murty

Prasad

Rao

et al. 2010

Pure Appl. Geophys.

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2-D shallow velocity structure is derived by traveltime inversion of the first arrival seismic refraction and wide-angle reflection data along the E-W trending Narayanpur-Nandurbar and N-S Kothar-Sakri profiles, located in the Narmada-Tapti region of the Deccan syneclise. Deccan volcanic (Trap) rocks are exposed along the two profiles. Inversion of seismic data reveals two layered velocity structures above the basement along the two profiles. The first layer with a P-wave velocity of 5.15-5.25 km s -1 and thickness varying from 0.7-1.5 km represents the Deccan Trap formation along the Narayanpur-Nandurbar profile. The Trap layer velocity ranges from 4.5 to 5.20 km s -1 and the thickness varies from 0.95 to 1.5 km along the Kothar-Sakri profile. The second layer represents the low velocity Mesozoic sediments with a P-wave velocity of 3.5 km s -1 and thickness ranging from about 0.70 to 1.6 km and 0.55 to 1.1 km along the E-W and N-S profiles, respectively. Presence of a low-velocity zone (LVZ) below the volcanic rocks in the study area is inferred from the travel-time 'skip' and amplitude decay of the first arrival refraction data together with the prominent wide-angle reflection phase immediately after the first arrivals from the Deccan Trap formation. The basement with a P-wave velocity of 5.8-6.05 km s -1 lies at a depth ranging from 1.5 to 2.45 km along the profiles. The velocity models of the profiles are similar to each other at the intersection point. The results indicate the existence of a Mesozoic basin in the Narmada-Tapti region of the Deccan syneclise.

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Interpretation of first arrival travel times in seismic refraction work

Cited by 11 publications

References 10 publications

Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Basement configuration of the Jhagadia–Rajpipla profile in the western part of Deccan syneclise, India from travel-time inversion of seismic refraction and wide-angle reflection data

Delineation of Subtrappean Mesozoic Sediments in Deccan Syneclise, India, Using Travel-Time Inversion of Seismic Refraction and Wide-Angle Reflection Data

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