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GM4.2/HS11.12/NH4.9 Media

Perturbation of Earth's surface systems by earthquakes (co-organized)
Convener: Christoff Andermann  | Co-Conveners: Kristen Cook , Jens Turowski , Maarten Lupker , Sean Gallen 
 / Thu, 21 Apr, 08:30–10:00
 / Attendance Fri, 22 Apr, 17:30–19:00

Large earthquakes can substantially perturb a wide range of Earth surface processes. The strong shaking caused by large earthquakes shatters rockmass, causes extensive landsliding, and alters the hydrological conductivity of the near surface. This leads to subsequent responses that include sediment loading of rivers, increased weathering capacity, and changes in subsurface water flow paths. The long term responses of surface processes in landscapes often last several years and even might outstrip the immediate co-seismic impact in their magnitude. Over time, earthquake-perturbed processes restore to background conditions, and the recovery process and transient timescales of different systems, e.g. weathering and sediment fluxes, provide particularly valuable insights into the generalities of landscape evolution. Earthquake mechanism and magnitude govern the magnitude of the effect to which extent the earth surface is perturbed.

Earthquakes are rare events and constraining the magnitude of impact, both co-seismic and post-seismic, involves fast action and good knowledge of the pre-earthquake conditions. Thus, only a few earthquakes have been monitored in detail and the full range of transient perturbation has not yet been understood.

We welcome contributions focusing on specific earthquakes and the associated change of the earth surface system, making links between different events and establishing commonalities of earthquake mechanisms with the magnitude of perturbation. Contributions may include all possible methods to determine perturbation of the hydrosphere, the weakening of the rockmass, river channel response, masswasting, erosion budgets as well as weathering and biochemical fluxes. Field-based, experimental, theoretical, and computational contributions are all welcome.