Figure 2: Map of the Duero basin, coloured according to elevation (m) with mountains in the north, east and south visible as bright yellow regions. The Bay of Biscay is visible in the north. Grey dots represent the sampling locations for population growth rates. Estimated epicentre locations are noted with the mustard and white points. The Duero river is visible as the turquoise line running east to west. Elevation data was downloaded from copernicus[dot]eu (EU-DEM v1.1) and waterway data from ea[dot]europa[dot]eu.