Factors like the tighter wound ball, smaller ballparks, the expansion of the league, uniformed strike zones, and state of the art weight training all contributed to the rise in runs per game.

Ore zones occur in the edge of local positive gravity anomaly, in the strike interrupted area or steep gradient area of regional aeromagnetic anomaly.

The along-strike heterogeneous extension is the dominant factor for forming the transverse accommodation zones and the fault segmentation is the direct cause for their formation.