CrustalP-wave velocity and velocity-ratio study in northeast India by a microearthquake survey |
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| Authors: | Reena De J R Kayal |
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| Institution: | (1) Geological Survey of India, P-49 CIT Road, 700 010 Calcutta, India |
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| Abstract: | The upper crustal ( 20 km)P-wave velocity beneath the Shillong Plateau and Nowgong area has been studied by the time-distance plot method. TheP-arrival data of the shallow (20 km) microearthquakes from three temporary networks are used, and the average velocity is found to be 5.55 km/s. The velocity ratio (V
p
/V
s
) for the upper crust (0–20 km) as well as for the lower crust (21–40 km) are determined by the Wadati-plot method and station-by-station method. The average value obtained by the two methods is compatible; theV
p
/V
s
ranges between 1.74 to 1.76. A generalized seismic velocity model of the area is suggested by this study, which has been very useful for microearthquake location. |
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| Keywords: | Microearthquake Wadati plot station-by-station method velocity-ratio upper crust lower crust precursor |
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