災禍是極端自然現象與脆弱人口之間的相互作用，同時考慮這兩個要素至關重要。沒有人，就沒有禍。
—菲爾．歐基佛、肯．威斯基特及班．韋斯納「不自然的自然災禍」
“Disaster marks the interface between an extreme physical phenomenon and a vulnerable human population. It is of paramount importance to recognise both of these elements. Without people there is no disaster.”
—O’Keefe, P., Westgate, K. & Wisner, B. Taking the naturalness out of natural disasters. Nature 260, 566–567 (1976)
