Fig. 2

Mayon Volcano Pyroclastic Density Current Hazard Map with kilometer radius (broken lines) from Mayon Volcano summit and location of barangays (villages). The 6-km radius Permanent Danger Zone (PDZ) is indicated in the red solid line. Note the Bonga Gully, which was formed after the 1984 eruption in the southeast, and the delineated area identified as High-Risk Zone (HRZ) enclosed in white broken lines in the southeast quadrant. Data sources: Danger Zones from PHIVOLCS, 2000; the Base map is an Interferometric Synthetic Aperture Radar - Digital Terrain Model (IfSAR-DTM) from NAMRIA, 2013; Administrative boundaries are adopted from PhilGIS, 2011