The Mw 7.7 Saravan earthquake, which occurred in 2013 near the Iran–Pakistan border, is recognized as the largest normal-faulting earthquake instrumentally recorded in Iran. In this study, the rupture behavior of the Saravan earthquake is investigated using a high-resolution array-based analysis method with enhanced spatial and temporal resolution. The analysis is based on teleseismic data recorded by the European seismic network and enables estimation of the spatiotemporal evolution of radiated seismic energy during the rupture process. The results indicate that the rupture can be divided into three distinct stages. The first rupture stage occurred over a duration of approximately 10 s and propagated about 20 km from the rupture nucleation point within the mantle of the subducting plate toward shallower depths and closer to the slab surface. Following this initial phase, the second rupture stage propagated in an east–northeast direction, rupturing a fault segment with an approximate length of 57 km at an average rupture velocity of about 3.8 km/s. Simultaneously with the second stage, a third rupture was activated west of the hypocenter and propagated over a distance of approximately 19 km with a rupture velocity comparable to that of the second rupture stage. This multi-branch rupture pattern reflects the high complexity of the rupture process in this large intermediate-depth earthquake.