Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Md. Arifour Rahman ¹, Syed Mustafizur Rahman ¹, M. Rezaul Islam ¹, Mumnunul Keramat ¹

Affiliations
1 Department of Applied Physics and Electronic Engineering, University of Rajshahi, Rajshahi-6205, BD

Abstract

The geologic constituents of the mid Atlantic seismic profiles have been studied with attributes ananysis to make a bridge in between geology and seismic. Attributes computation is justified for one test signal. Later the amplitude and frequency attributes have been estimated the mid Atlantic region seismic profiles. The image made in this work is found better than that of the raw seismic data. Amplitude attributes indicated reasonable stratified earth of the crust. The reflecting beds are well presented in the analyzed sections. The boundaries are characterized on the basis of basic wave propagation, as it is observed that the signal strength from the nearest reflecting bed is higher than that of distant bed. Estimated frequency attributes of the profiles are indicated the evidences that the oceanic crust are probably gabbros with little mixture of peridotite. The constituents are estimated on the basis of frequency distribution of each trace of the whole profiles. Analysis has suggested that gabbro and peridotite are the main geological constituents mixing up with different degrees with depths of the study area.

Keywords

Oceanic Crust, Constituents, Seismic Profiles, Signal, Amplitude, Frequency, Attributes.

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Syed Mustafizur Rahman ¹, M. Rezaul Islam ¹, Mumnunul Keramat ¹, M. D. Sultan-Ul-Islam ²

Affiliations
1 Department of Applied Physics and Electronic Engineering, University of Rajshahi, Rajshahi - 6205, BD
2 Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, BD

Abstract

The properties of Tibetan bright spots have been studied in this work with seismic attribute analysis. Tibetan bright spots are band of reflections along 150 km of the northern Yadong-Gulu rift in southern Tibet, which are made by INDEPTH project. Seismic attributes analyses are the separate displays of seismic time amplitude map. Attribute computation tools are developed in this work using complex trace analysis and have shown justification with example. Using the developed tools, frequency attributes of the INDEPTH seismic data have been produced and it has studied the properties of Tibetan bright spots. Analysis suggests the presence of free water below the analyzed seismic profiles at a depth of about 15 km along with the big low S-wave velocity layer starting from 15 km depth and continuing up to different depths from 45 km to 94 km.

Keywords

Seismic Attributes, Bright Spots, Amplitude, Frequency, S-wave-velocity, INDEPTH Project, Tibet, Himalaya.

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