Cartago is in a high seismic hazard zone
NSR-10, the Colombian seismic building code, lists Cartago with Aa 0,25 and Av 0,25: a high seismic hazard zone.
New structure follows NSR-10. Its Título E gives simplified rules for houses of one and two storeys; a third storey is outside it and needs a full structural design.
Adding a floor over a house that exists, or reinforcing one, needs a structural design by a licensed engineer first. The app marks those projects and never draws a structure.
Source: NSR-10, Título A, Apéndice A-4 (seismic hazard values by municipality) – read it
