Records of the Geological Survey of India, Volume 113, Parts 4-6The Survey, 1980 - Earthquakes Vols. 1- include Report of the Geological Survey, 1867- ; v. 32- include Review of the mineral production of India, 1898/1903- ; v. 75 consists of Professional papers, no. 1-16; v. 76 consists of Bulletins of economic minerals. |
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Page 71
... reflection signals observed within a limited range appeared to be much stronger than the refraction arrivals on the records . This phenomenon is caused by the enhanced energy associated with the reflected waves at the critical angle ...
... reflection signals observed within a limited range appeared to be much stronger than the refraction arrivals on the records . This phenomenon is caused by the enhanced energy associated with the reflected waves at the critical angle ...
Page 73
... reflected waves and partly due to the dis- turbances caused by the direct waves originating from the vicinity of the shot hole . At the point of critical angle the time of arrival of the reflected waves is minimum and at this point the ...
... reflected waves and partly due to the dis- turbances caused by the direct waves originating from the vicinity of the shot hole . At the point of critical angle the time of arrival of the reflected waves is minimum and at this point the ...
Page 77
... reflection events near the points of critical angle are characterised by high amplitude , which stand out clearly on the re- fraction records . The enhanced energy of reflected waves is mostly due to the contrast between seismic ...
... reflection events near the points of critical angle are characterised by high amplitude , which stand out clearly on the re- fraction records . The enhanced energy of reflected waves is mostly due to the contrast between seismic ...
Contents
Exploration for coal with particular reference to Tertiary coalfields of North Eastern India | 1 |
Problems of correlation of PreGondwana rock units of Arunachal Pradesh and adjoining areasa review | 15 |
The Sung Valley alkaline ultramafic carbonatite complex East Khasi and Jaintia Hills districts Meghalaya 24 | 24 |
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alluvium anorthosite assemblage associated augite bands basalt flows basin beds belt biotite Bombay bore holes borehole breccia calcite carbonatite Charnockite chert chlorite chromite clay clinopyroxene coal complex Deccan Trap deposits developed district drainage drilling dykes fault felspar fluorite folds Formation fossil fragments geochemical Geol Geological Survey geomorphic gneisses Gondwana grade grains granite granulites greisens grey groundmass Group hills Himalayas ijolite indicated intrusive laterite layers limestone magnetite Manipur mapping metamorphic metres migmatites mineralisation minerals Narmada NW-SE occur olivine ophiolite phenocrysts phosphorite phyllite plagioclase Plate porphyritic Pradesh present pyroclastic pyroxene pyroxenite quartz quartz veins quartzite region river rocks samples sandstone schist seam sedimentary sediments sequence serpentinite shale sillimanite soil stratigraphic structure studies sub-surface surface Surv Survey of India Tapti tectonic thickness thin tion trending tuff ultramafic Unpublished GSI Report upto Vaghur valley volcanic zone