This field excursion focuses on the Himalayan Frontal Thrust in Upper Assam, a critical region for understanding seismic hazards in the eastern Himalayan arc. The trip will explore the Kalabil fault scarp, a remarkable ~2 km long and 10–15 m high E-W trending surface rupture, an evidence of significant past seismic activity. Participants will visit trench sites across this scarp to investigate the timing and extent of past earthquakes, particularly assessing overlap between the 1697 CE Hemi-Basti and 1714 CE Bhutan earthquakes. These events are believed to be segmented by the transverse Kopili Fault, which may play a crucial role in arresting or transmitting rupture propagation. The excursion aims to clarify earthquake recurrence patterns, rupture segmentation, and paleoseismic records critical for reassessing seismic risk in the Assam segment of the Himalayan plate boundary.