The energy release and propagation of an earthquake depend on seismic source factors like shear strength, frictional stability, and rupture character of the rock. These are dependent on the geological formation of the region. However, limited studies are available to relate the region's geology and seismic source rupture character. The approach aims to understand the rupture character by accounting for the geology and seismicity in the geographic information system. India is divided into different geological zones. Seismic source rock characters like mineral composition, age, strength, and lithostratigraphy in these regions are different and depend on the geological formation. Different geological zones with past earthquakes and seismic sources from Geological Survey of India have been understood, and the regional rupture character of Delhi folding geological zone has been established in this paper. The subsurface rupture length and percentage fault rupture for past earthquakes are estimated using Wells and Coppersmith in (Bull Seismol Soc Am 84:975–1002, 1994 [1]) and the method proposed by Anbazhagan et al. in (J Seismol 19:695–719, 2015 [2]). The fault lengths are included, aiding in identifying the regional rupture for different length segments. The newly estimated regional rupture can be used to obtain the maximum potential magnitude of each geology, which can be related to the rock formations in the region. In the Delhi folding formation, it is observed that the maximum magnitude that occurred in the past is 5.7 and the predicted maximum magnitude is 6.8. The predicted maximum value aligns with the observed maximum value + 1 increment.