In the case of catastrophic disasters of vast dimensions, the possibly most effective approach should consider three parallel issues:
Collecting a vast cartographic documentation from available sources (the local ones being in most cases highly damaged) and integrating it with references to cultural heritage presence and kind: buildings, areas, artefact-“containers” of various kind;
Assessing present conditions and documenting them in photos/pictures/descriptions with due consideration given to the sites’ interrelation;
Training local forces to let them have the least destructive post-crisis approach to artefacts.
This last issue should also give due consideration to the identification on a local basis of the stakeholders (remaining or new) to be involved in the operations.