Fig. 7
From: Creating a digital database of tephra fallout distribution and frequency in Japan
Location map of prefectural offices and regions defined in our study (a). (b) Cumulative number of events versus tephra fall thickness exceeding a specific threshold for the last 150 kyr at the prefectural offices in the four regions of Japan: (i) NE-E, (ii) NE-W, (iii) W, and (iv) SW. The colored curves in the plots show the specific key locations. The grey dotted curves in the plots show other locations