Can memories of trauma be repressed?

There have been studies of people who have survived events including war, earthquakes, death of parents, rape, violent attacks, and natural disasters:

"...It is striking that none of the more than 11,000 victims is reported to have repressed the memory of the traumatic event.
Admittedly, some of the survivors in some of the studies did exhibit amnesia for the trauma, but in all cases, the amnesia appears explainable for ordinary reasons, such as loss of consciousness or early childhood amnesia..."

See Studies of Psychological Symptoms in Trauma Survivors, Harrison Pope et al.