  Kopili fault has been experiencing higher seismic and tectonic activity ([1],
[2]) during the recent years. These kinds of active tectonics can be inspected
by examining coda-wave attenuation and its dependence with frequency. Here, we
report spatial variation of coda attenuation of this region. The obtained
results reveal that there is velocity anomaly at depth 210-220 km as there
arises sharp changes in attenuation coefficient ({\gamma}) and frequency
parameter (n) which are supported by available data reported by other
researchers for this region.
