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In recent years, the Kopili fault reported an increase in seismic activity. Coda-wave attenuation and its frequency dependency can be used to examine the seismo-tectonics. Here, we document the regional heterogeneity in the coda attenuation. Present data in this region report Q0 (value of QC at 1 Hz) variation from 63 (for 30 s window) to 213 (for 90 s window) and n from 1.330 (for 30 s window) to 0.913 (for 90 s window). These significant fluctuations in the attenuation parameter (Q0) and frequency parameter (n), indicate a velocity inconsistency at depths of 230-270 km. This anomaly may be associated with the anisotropy originates in the asthenosphere-lithosphere transition or asthenospheric mantle at depths of 160-320 km. Accordingly, this concise work comprehensively analyzes reported implications, supported by observational evidences.
Bora et al. (Mon,) studied this question.