natural_disaster_survival_memory_effect

natural_disaster_survival_memory_effect = {
	if = {
		limit = {
			any_memory = {
				memory_type = survived_disaster_memory
				memory_age_years < 1
			}
		}
		# Don't add duplicates
	}
	else = {
		create_character_memory = { type = survived_disaster_memory }
		ordered_memory = {
			order_by = memory_creation_date
			save_scope_as = memory
			scope:situation = {
				switch = {
					trigger = situation_type
					natural_disaster_flood = {
						scope:memory = {
							set_variable = { name = disaster value = flag:flood }
							set_variable = { name = river_region value = scope:situation.var:river_region }
						}
					}
					natural_disaster_earthquake = {
						scope:memory = {
							set_variable = { name = disaster value = flag:earthquake }
							set_variable = { name = epicenter_county value = scope:situation.situation_center_province.county }
						}
					}
				}
			}
			set_variable = { name = location value = memory_owner.location }
		}
	}
}

As written in game/common/scripted_effects/10_dlc_tgp_natural_disaster_scripted_effects.txt.