An analytical migration method for crustal wide angle reflections

Kaila, K. L.; Chowdhury, K. Roy; Krishna, V. G.

doi:10.1007/bf01635034

Cited by 18 publications

(2 citation statements)

References 15 publications

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“…For this conversion an average velocity model was determined for the entire region based on the analysis of mutual shot point data for reflection traveltimes (Kaila & Krishna 1979). This model was translated to a 1-D interval velocity model to convert the reflection traveltime data to depth and migrated using the approach of Kaila et al (1982). The weak points of this approach were the conversion of average velocity to an interval velocity model, the assumption that this model holds good for the entire region of investigation and the inability to generate synthetic seismograms and compare the same with the observed seismograms.…”

Section: Introductionmentioning

confidence: 99%

The seismic structure of the Saurashtra crust in northwest India and its relationship with the Réunion Plume

Rao¹,

Tewari²

2004

Geophysical Journal International

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SUMMARY The Saurashtra Peninsula in northwest India, lying at the northern boundary of the Deccan Volcanic Province, is almost entirely covered by these volcanics. Analogue seismic refraction/wide‐angle reflection data along a 160 km long profile, from Navibandar to Amreli, were collected during 1977 to determine the crustal configuration. Reprocessing of these data, after digitization, has yielded a crustal model that is significantly different from the earlier model of Kaila et al. The model shows the upper crust down to a depth of 16 km in the west and 13 km in the east and underplating (velocity of 7.20 km s−1) of the lower crust. The Moho is at a depth of ∼36 km in the western part and at 32–33 km in the eastern part; the change of depth is quite sharp almost in the middle of the profile. Similar depth changes are seen in other crustal horizons indicating a deep fault that is in line with the extension of the Proterozoic Aravalli trend in to the Saurashtra Peninsula. The crustal structure in the eastern part is similar to that in the Cambay Basin and indicates that the crust to the east of the proposed fault is uplifted. The uplifted region extends as far as another arm of the Aravalli trend that turns eastwards. Crustal underplating in large parts of western India is confined to the corridors affected by the passage of India over the Réunion Plume in the Late Cretaceous. The shallower Moho appears to be confined to the areas close to the axis (trace of the plume) on Earth's surface of the plume.

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Section: Introductionmentioning

confidence: 99%

The seismic structure of the Saurashtra crust in northwest India and its relationship with the Réunion Plume

Rao¹,

Tewari²

2004

Geophysical Journal International

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“…A crustal depth section ( Fig. la) has been prepared by the use of wide angle reflection data from shot points 0, 40, 80, 120 and 235 which were recorded for long distances using the migration method of Kaila, Roy Chowdhury & Krishna (1982).…”

Section: Introductionmentioning

confidence: 99%

Deep seismic soundings along Hirapur-Mandla profile, central India

Kaila¹,

Murty²,

Mall³

et al. 1987

Geophys J Int

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The crustal depth section along Hirapur-Mandla profile has been computed in two steps from Deep Seismic Sounding (DSS) data. The shallow section up to the crystalline basement is derived by inverting first arrival refraction travel times. The upper Vindhyan sediments (velocity 4.5 km s-') have a maximum thickness of about 1.5 km at Bakshaho. The lower Vindhyan sediments (velocity 5.4 km s-') were deposited north of Narmada-Son lineament between Katangi and Narsinghgarh in a graben developed in crystalline basement. The thickness of the lower Vindhyans increases from north to south towards Katangi and the depth to the basement reaches 5.5 km near Jabera. The depth to the Moho boundary varies from 39.5 km near Tikaria to 45 km at Narsinghgarh. The narrow block between Katangi and Jabalpur forms a horst feature which represents the Narmada-Son lineament forming the southern boundary of the Vindhyan basin. Two-dimensional ray tracing was performed generating travel time curves from various shot points which were matched with observed travel time data.

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