2. Costa Rica Seismogenesis Project OBJECTIVES: Explain causes of seismogenic behavior along convergent margins that erode rather than accrete. Record low level physical and chemical signals with instruments close to the plate interface dynamic environment. IMPLIMENTATION: A 3-stage program of non-riser & riser drilling with integrated geophysical & laboratory experiments. C R I S P

3. + + Why the seismogenic zone is accessible to scientific drilling offshore Costa Rica Why deep subduction zone processes along erosional margins are different from accretionary margins Why deep subduction zone processes along erosional margins are different from accretionary margins Effects of basement relief on the seismogenic zone Effects of basement relief on the seismogenic zone A proposed 3-stage drill and geophysical investigation A proposed 3-stage drill and geophysical investigation

4. CENTRAL AMERICA, REGIONAL SETTING CENTRAL AMERICA - OVERVIEW

13. C R I S P Implementation A rea where penetration of seismogenic zone possible identified from regional geophysics STAGE 1, non-riser drilling – margin framework material characterized, material input to seismogenic zone quantified Plate interface imaged, down-hole geophysics and seismic attributes STAGE 2, non-riser drilling to 3km – proto-seismogenic zone stable–slip characterized, eroded debris sampled Micro EQ monitoring, down-hole geophysics and seismic attributes STAGE 3, riser drilling to 5 km in 0.5km deep water characterize seismogenic zone and set monitoring instruments