Periglacial melting processes can provide the water source for secondary lahars triggered by volcanic and/or meteorological phenomena on volcanoes. Between December 2015 and April 2016, four major were reported southeast of Chimborazo volcano (Ecuador). Fieldwork allowed determining area (1.670.37 km2), volume (3E+05 to 7E+05 m3), peak discharge (100 - 150 m3/s) mean speed (2 4 m/s) these flow...

1 Geological evidence indicates that low-latitude polygonally-patterned grounds on Mars, 2 generally thought to be the product of flood volcanism, are periglacial in nature and record a 3 complex signal of changing climate. By studying the martian surface stratigraphically (in terms 4 of the geometrical relations between surface landforms and the substrate) rather than geneti5 cally (by form an...