Abstract

New measurements of LgQ are obtained using a reliable two-station method to understand the attenuation characteristics across the Indian subcontinent. We use data from 514 events with magnitude≥3.5 and depth less than 40 km collected during 2006–2008 from 17 stations deployed across India. We measure 1-Hz LgQ(Q0) values between many pairs of stations. Finally, 34 high-quality interstation paths were selected from 336 possible pairs that are (1) aligned approximately with the source and (2) separated enough to permit the use of the standard two-station method for LgQ measurement. We found some spatial variation in Lg wave attenuation across India. Low-Q regions are present in western India. We attribute this to the recent tectonic activities in this region. The central Indian platform shows a moderate to high Q0 value. The southernmost part of India exhibits higher values, which may indicate that the crust in this part is more stable. The obtained values correlate with the regional crustal heterogeneities and tectonic trends. As a whole, the estimated interstation Q0 values compare well with the areas of moderate seismicity across the Earth.

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