Fig. 1From: Creating a digital database of tephra fallout distribution and frequency in JapanWorkflow for IB-THA. (a) Re-digitization of isopach maps and sampling at arbitrary localities limited by the third standard mesh grid (see text), (b) preparation of a tephra fall record for a specific location, and (c) calculation of the cumulative number of tephra fallout events exceeding a specific thicknessBack to article page