Figure 3. Subdivision according to volcano characteristics.

PPV and NPV subdivided according to (blue) volcano type13 (caldera, shield, stratovolcano); (red) tectonic setting (subduction, rift, hotspot); (green) eruptive history13; (purple) magma composition13 (basalt, andesite, rhyolite-dacite, trachyte-phonolite). Left side: proportion of volcanoes that deformed that also erupted during the observation period (PPV); right side: proportion of volcanoes that did not deform that also did not erupt during the observation period (NPV). Coloured bars show values for the 3-year period 2007–2010 for all 540 systematically covered volcanoes and the numbers give the sample size for each category; black outlines show the combined 18- year and 3-year data sets. Black vertical bars mark the 95% confidence bounds on the global values (enclosed white bar) on the 3-year data set, vertical dashed line indicates the global values for the combined data sets.