Map of explosive deposits at the edge of Moku‘āweoweo, the summit caldera of Mauna Loa.

Map of explosive deposits at the edge of Moku‘āweoweo, the summit caldera of Mauna Loa. Map showing the size distribution of ejecta, sorted by maximum length in centimeters (one inch is about 2.5 cm). The colors indicate the different size fractions in centimeters. The largest blocks were found closest to the rim. In general, clast size diminished with increasing distance, but medium-sized blocks were found nearly at the distal extent of fan limits. The dark flows in the image outside the caldera are the youngest ‘a‘ā flows. USGS map.