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Title: Ultrasonic pulse-broadening and attenuation in volcanic rock - A case study
Authors: Rao, M V M S
Sarma, L P
Lakshmi, K J Prasanna
Issue Date: Jun-2002
Publisher: NISCAIR-CSIR, India
Abstract: Ultrasonic pulse-broadening measurements at 1.0 MHz frequency have been carried out at the ambient conditions in a set of volcanic rocks of south-east Gujarat. The experimental data have been processed along with the results of P-wave velocity (Vp) measurements leading to the determination of internal friction (Qp-1) and attenuation (αp). The attenuation in rhyolites is relatively high (average Qp-1= 0.0051 , αp = 0.0330 dB/cm) compared to basalts (average Qp-1= 0.0019, αp = 0.0100 dB/cm) which are fine-grained and well crystallized. The mineral composition, in particular, the volume percentage of ground mass in rhyolites is found to have a strong control on both the attenuation and velocity of the rock samples tested. The experimental method is briefly described and the results obtained are presented and discussed.
Page(s): 396-401
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.40(06) [June 2002]

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