The Costa Rica Seismogenesis Project (CRISP) was designed to elucidate processes that
control nucleation and seismic rupture of large earthquakes at erosional subduction
zones. The CRISP study area is located offshore the Osa Peninsula where the incoming
Cocos Ridge has lifted the seismogenic zone to within reach of scientific drilling.
This area is characterized by low sediment supply, a fast convergence rate, abundant
plate interface seismicity, and a change in subducting plate relief along strike.
In addition to elucidating processes at erosional convergent margins, this project
is complementary to other deep fault drilling projects (e.g., The Nankai Trough Seismogenic
Zone Experiment and the Japan Trench Fast Drilling Project). Integrated Ocean Drilling
Program (IODP) Expedition 344 is the second expedition of CRISP Program A (IODP Proposal
537A-Full5), a first step toward deep riser drilling through the seismogenic zone.
The focus of CRISP Program A is on the shallow lithologic, hydrologic, stress, and
thermal conditions that lead to unstable slip in the seismogenic zone. Together with
IODP Expedition 334, the first expedition of CRISP Program A, these data provide exciting
insights into the nature of seismogenesis and erosive plate boundaries.