Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

In contrast, to the east, there is a succession of salients and recesses, which are more pronounced. This reflects possible lateral variations in the depth of the detachment level, the dip of the faults, the maturity of the frontal folds, their erosion and sedimentation. Furthermore, numerous embryonic folds and blind faults have been documented several kilometers south of the topographic front (e.g. Delcaillau, 1992; Duvall et al., 2020; Mugnier et al., 2022). It is likely that these lateral variations in subsurface frontal structures influence the surface expression of themajor earthquakes that rupture the locked segment of the Main Himalayan Thrust system up to the surface along the Himalayan front. One of the most important topographic offsets at the front of the range is that of the Chandra bagh, a structure almost 35 km-long Fig. 1: Map of the region of interest. Red circles are the largest aftershocks of the 2015 M7.8 Gorkha Nepal earthquake. Green and red dashed lines are macroseismic intensities VII and VIII isoseists of the M8.4 1934 AD earthquake (Sapkota et al., 2016). White and grey squares are paleoseismological trenches and morphotectonic sites with dated ruptures (see text for references ). The black box locates the region of interest, and the frame of Fig. 2.