An earthquake of Mw 4.0 occurred on 3 June 2017, south of Warna Dam, in the vicinity of the Western Ghat Escarpment (WGE), India. This earthquake is associated with a foreshock–aftershock sequence of 123 events of ML 0.5–3.5 forming an intense cluster; this sequence occurred over the course of one month, beginning in the last week of May 2017, and seismicity continues. This earthquake sequence occurred at a new location compared with the past ∼50  yrs of seismicity of the region. A predominantly normal‐type focal mechanism with a component of strike slip is obtained for this Mw 4.0 earthquake, using the P‐onset data from a seismic network of 20 stations. Two aftershocks of Mw 3.0 and 3.5 have similar focal mechanisms. The northwest–southeast‐trending fault plane is well correlated with the trends of a magnetic anomaly obtained from airborne gravity gradiometry and magnetic data, and lineaments derived from light detection and ranging (lidar) studies. Spatiotemporal analysis of this seismic sequence reinforces the phenomenon of migration and alternates phases of fault mechanisms with respect to the previous seismicity in the Koyna–Warna region.

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