Disasters lead to mental health problems such as depressive disorder, anxiety disorder, and Post-Traumatic Stress Disorder. The purpose of this study was to assess the factors that affect the severity of indirect trauma based on the characteristics of human-made disasters. We also analyzed the degree of indirect trauma by region by comparing the disaster site and the control community. The severity of indirect trauma caused by the Sewol ferry incident, depressive symptoms, and anxiety symptoms was assessed in the survey. Gender (female), the presence of children, and a high level of monthly income were assessed as risk factors for increasing the severity of indirect trauma. The severity of indirect trauma was higher in the control community that was not involved in the Sewol ferry accident. We confirmed that the risk factors and protection factors are determined by the characteristics of the disaster and the victim in the case of a human-made disaster. To overcome indirect trauma, it is also necessary to provide social support and information for mental health recovery to those who indirectly encounter the disaster.

灾难导致心理健康问题，例如抑郁症，焦虑症和创伤后应激障碍。这项研究的目的是根据人为灾难的特征来评估影响间接创伤严重性的因素。我们还通过比较灾区和控制社区，按地区分析了间接伤害的程度。调查中评估了由Sewol渡轮事件，抑郁症状和焦虑症状引起的间接创伤的严重性。性别（女性），儿童的存在和较高的月收入被评估为增加间接创伤严重程度的危险因素。在未参与Sewol渡轮事故的对照组中，间接创伤的严重程度更高。我们确认，在人为灾难的情况下，风险因素和保护因素取决于灾难和受害者的特征。为了克服间接创伤，也有必要为间接遭受灾难的人们提供社会支持和信息，以帮助他们恢复精神健康。