Pages: 1-11

Abstract

Measurement of the area, slope and height of the land surface roughs and forms in the vicinity of the faults is a possible method for evaluating the active tectonics of a region. Fans are enumerated amongst the most distinct geomorphological forms and reliefs. The studied regions constitute the northern margin of Jazmouriyan Plain (Jiroft Fault) and Palami Fault in the form of a thin and continuous strip, respectively, featuring a northwest-southeastward trend and an approximate northern-southwestward trend. 23 and 6 fans of the structural type were correspondingly investigated in the northern margin of Jazmouriyan Plain and in the west of Palami Fault, respectively. The examined indices of the fans in the study region were symmetry, area and slope. The goal in calculating these indices in the studied fans was investigating the amount of the faults’ activities according to the effects they would have on the shape and slope of the fans. Considering the symmetry index, the highest rate of asymmetry in the northern margin of Jazmouriyan Plain has been found in the Fan no.10, hence this part of the fault is deemed to be more active. Based on the area index, the fault segment overlooking the Fan numbers 2 to 5 and 15 is more active due to the non-correlation of the areas and, based on the index of slope, there is no inverse relationship between the slope of the fan and the area of the drainage basin in the fan numbers 4 and 8-10 and 15 which feature very steep slopes hence the fault segment overlooking them is more active. In the west of Palami Fault, the highest rate of asymmetry has been documented for the fan no.5 hence this part of the fault is more active. Based on the index of area, the fault segment overlooking the fan numbers 2 to 3 is more active due to the existence of no correlation between the areas and, based on the index of slope, there is no inverse relationship between the slope of the fan and area of the drainage basin in fan nos. 3 and 4 hence the fault segment overlooking them is more active. Blending the results obtained for the abovementioned indices, fan nos. 5, 6, 9 and 11 to 16, in the northern margin of Jazmouriyan Plain and fan nos.2, 3, 4 and 6, in the west of Palami Fault are amongst the fans overlooking the active fault segments due to the lack of positive correlation between slope and height.