On Saturday, the Philippine Institute of Volcanology and Seismology (Phivolcs) reported a moderate explosive eruption at Kanlaon Volcano, located on Negros Island. This event took place around 12:46 PM and concluded approximately two minutes later. The explosive activity ejected an ash plume that reached heights of 8.435 kilometers above sea level, significantly affecting nearby areas.
In response to the eruption, Phivolcs employed advanced computer simulations to assess the potential impact of ashfall. The simulations were based on the data collected during the eruption, with dispersion maps created to provide guidance on ashfall monitoring in affected communities. These simulations indicated that the ash dispersion would continue to be monitored from 12:46 PM until 6 PM that day, allowing residents to prepare appropriately.
The ashfall was classified into three distinct categories: trace, minor, and substantial, according to the amount of ash deposited. Specifically, trace deposits are defined as 1/256 inch, minor deposits at 1/32 inch, and substantial deposits at 1/4 inch. Accompanying maps depicted varying plume heights of 6, 10, and 11 kilometers for local forecasts, demonstrating the scale of the incident's potential impact.
Using the Ash3D dispersion model, a tool developed by the United States Geological Survey, Phivolcs simulated the movement and settling patterns of volcanic ash. However, it is crucial to note that the agency warned the public that the output from these models is not an official forecast. Ash may settle beyond the targeted forecast area, necessitating precautionary measures in wider surrounding communities.
In light of the eruption, Phivolcs has advised residents to maintain a safe distance from the volcano, especially within a 6-kilometer permanent danger zone. Those living in areas potentially affected by ashfall are urged to wear face masks and protective eyewear to safeguard against inhalation and irritants caused by the ash. This safety recommendation underscores the agency's commitment to public health amid volcanic activity.