Date/heure
Date(s) - 18 juin 2026
13 h 15 min - 14 h 15 min
Catégories
18 juin 2026, amphithéâtre du CRPG | Zakaria Ghazoui-Schaus (British Antarctic Survey)
Climate and Earthquakes Recorded in Nepalese Lake Sediments
This lecture examines how Nepalese lake sediments can be used to reconstruct the intertwined histories of earthquakes, monsoon variability and mountain hazards in the central Himalaya. It revisits earlier work at Lake Rara, where sedimentary records revealed previously undocumented large earthquakes in western Nepal and, more recently, showed that major earthquake occurrence over millennial timescales follows a largely stochastic rather than cyclical pattern. Building on this, the lecture explores current research on lipid biomarkers as proxies for past monsoon precipitation, and the broader effort to separate seismic disturbance from climate-driven sedimentary change within Himalayan lake archives. It then opens onto future work based on a W-E/N-S lakes transects across Nepal, combining sedimentology, geochemistry and geophysics to reconstruct regional patterns of earthquake shaking, hydroclimatic change and cascading hazards, including avalanche activity under ongoing warming.