AN APPRAISAL ON RECENT SEISMICITY AND RECEIVER FUNCTION ANALYSIS FOR MOHO-DEPTH DETERMINATION BENEATH SHILLONG MASSIF

Shillong plateau in the Northeast India presumed to follow an orogeny mechanism different from the adjacent thrust belts like the eastern Himalayas or the Indo-Burman ranges, having almost a vertical plunge in its Bangladesh facing southern margin was treated as a kind of inselberg with the devastation history of the geat Assam earthquake of 1897 (MW~8.1). Spatial distribution of seismicity triggering since 1966 infers the zones of intense seismicity within the plateau and its vicinity. Further, receiver function analysis from teleseismic events estimated the Moho-depth of the Shillong massif to be at ~33.25 km. Above all, the present study incorporates both qualitative as well as quantitative approach while understanding the type of seismicity pattern in the Shillong massif and the subsurface scenario as well.