The Palghar region in western India has recently witnessed intense seismicity, categorized as swarm activity in an intraplate setting. Numerous studies have been hitherto conducted to interrogate the causative mechanisms for this nonvolcanic tremor. In this study, we present the seismic crustal velocity structure of the source region using travel times of 32,921 P and 31,452 S phases picked from waveforms of 8359 events recorded by a six‐station seismological network of the Council of Scientific and Industrial Research‐National Geophysical Research Institute, installed to closely monitor this activity. The tomographic sections reveal presence of low shear velocity and high VP/VS anomalies in the swarm area, indicative of fluids in the upper crust down to 15 km. Drawing support from the low‐resistive zone inferred from inversion of magnetotelluric data, we emphasize the role of crustal fluids in the genesis of such swarms.

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