Epicenter is a song from F.E.A.R. 2: Project Origin. The song is track 67 on the unofficial soundtrack and was composed by Nathan Grigg.
This tune plays when Michael Becket reaches the Epicenter, where the ground zero of the Origin Facility Explosion occurred. He encounters more Specters and witnesses Harold Keegan's transformation in becoming one of them as his physical body was destroyed by the influence of Alma Wade.