Spatial variation of Coda Q in Kopili fault zone of northeast India as a probe for heterogeneous media

TL;DR

This study investigates the spatial variation of coda-wave attenuation in the Kopili fault zone of northeast India to understand heterogeneity and velocity anomalies at depth, revealing significant seismic activity and complex media structures.

Contribution

It provides new insights into the heterogeneity of the fault zone by analyzing coda-Q variations and identifying deep velocity anomalies through attenuation and frequency parameters.

Findings

Sharp changes in attenuation coefficient and frequency parameter at 210-220 km depth

Evidence of velocity anomaly at significant depth

Correlation with previous seismic data supports heterogeneity in the region

Abstract

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.