Diastrophism refers to deformation of the Earth’s crust due to diastrophic movements (deforming movements) such as folding, faulting, warping (bending or twisting of a large area) and fracturing. All processes that move, elevate or build up portions of the earth’s crust come under diastrophism. 
They include: orogenic processes involving mountain building through severe folding (crust is severely deformed into folds) and affecting long and narrow belts of the earth’s crust; epeirogenic processes involving uplift or warping of large parts of the earth’s crust (simple deformation); earthquakes and volcanism involving local relatively minor movements; plate tectonics involving horizontal movements of crustal plates. The most obvious evidence of diastrophic movement can be seen where sedimentary rocks have been bent, broken or tilted.
BPCS Notes brings Prelims and Mains programs for BPCS Prelims and BPCS Mains Exam preparation. Various Programs initiated by BPCS Notes are as follows:-