Figure 4

Thickness with distance from source for the Fogo A eruption. A. The data shows significant spread and it is difficult to fit a meaningful regression line. Power and exponential regression functions are fit to the data. Given the large variance in the data, the Fogo A deposit was split into quadrants around the vent B and power law C and exponential D regression were applied. There is much less variance within each quadrant than when the data are pooled. There is little difference between the southern and northern quadrants however, the eastern quarters (NE and SE) show thickness decays more quickly to the east compared to the west (NW and SW) – see text for discussion.