Spontaneous volunteers are people who join disaster response without prior assignment from formal response organizations and begin helping through improvised or local coordination [@twiggmosel2017].

The term matters because it names a recurring feature of disaster environments that command-oriented emergency management often treats as a problem to be controlled rather than a capacity to be supported. Disaster research places spontaneous volunteers alongside emergent groups as regular parts of disaster response [@stallingsquarantelli1985; @twiggmosel2017].

Spontaneous volunteers can add labor, local knowledge, transport, communication, and care quickly. They can also create coordination problems when official systems refuse to adapt to them or when they lack accountability to affected communities [@twiggmosel2017].