This study examines the entanglements of natural disasters and cultural changes from an ecosemiotic point of view. Taking the case of Mt. Merapi’s periodic eruptions and the locals’ interpretations of such constant natural hazards, it is based on empirical data gathered through longitudinal qualitative fieldworks on the local communities surrounding this volcano. In order to adapt to the constant natural hazards in their environment, disaster prone societies develop unique sign systems binding cultural and natural processes. This study shows that traditionally, (...) unique sensorial-environmental sign systems have formed the basis of communication between human and environment, allowing the locals to perceive the eruption as a communication involving them and local environmental agencies. Recently, the eruptions have triggered the adoption of new livelihoods of local people, as well as the acceptance of new scientific signs for the interpretation of the activities of the volcano. The latter has been accompanied by significant cultural changes, including the adoption of the idea of progress and the transformation of the previous entanglements of local culture and its natural environment. The study concludes that natural disasters, entangled with ongoing social transformations, may play a fundamental role as triggers of semiotic change in a community. Such semiotic change can in turn modify the interpretation of the natural disaster itself, and in that way shift the way humans perceive and interact with their environment. (shrink)