A càrrec de Dr. Hans NELSON (CSIC Instituto Andaluz de Ciencias de la Tierra, Universitat de Granada)
Organitzat conjuntament CSIC-UB

Data: 25-05-2011
Hora: 12:00
Lloc: Sala d'actes de l'Institut Jaume Almera

Descripció:
This lecture will describe the techniques that define seismo-turbidites and that are used to develop the Holocene paleoseismic history of the Cascadia Subduction Zone and northern San Andreas Fault. The different great earthquake frequencies, hazards and strengths for each fault system will be outlined. The strongest earthquakes (Mw 9) result in typical multi-pulsed turbidites in the Cascadia turbidite systems; weaker earthquakes (Mw 8) and synchronous triggering in multiple tributary canyons result in stacked turbidites downstream below tributary canyon and channel confluences in the San Andreas turbidite systems. The cyclic shaking of great earthquakes causes seismic strengthening of slope sediment, restricted development of debrites compared to turbidites in basin floor deposits, and short basin floor run out distances of mass transport deposits in active tectonic margins compared to muddy passive margins.