Costa Rica Seismogenesis Project 2 (CRISP 2)
Proposal#537-Full>> Click (Full version PDF)
Proposal#537-Add>> Click (Addendum PDF)
IODP Expedition 334>> Click (Related IODP expedition by USIO)
22, Oct. – 17 Dec., 2012
Based on Expedition 334 and Proposals 537A-Full5 and 537A-Add, this expedition aims to understand the processes that control nucleation and seismic rupture of large earthquakes at erosional subduction zones. Scientific objectives include (1) the characterization of the lithology, texture, and physical properties of the subducting sediments and basement; (2) the rate of subduction erosion and subsidence history of the upper plate; (3) the fluid/rock interactions and geochemical processes active within the upper plate; and (4) the evolution of the stress field upslope.
|Proposed Science Plan for Costa Rica Seismogenesis Project 2 (CRISP) Expedition 344＞＞PDFダウンロードExpedition 344 is a continuation of Expedition 334 and is part of a larger project designed to understand the processes that control nucleation and seismic rupture of large earthquakes at erosional subduction zones. Scientific objectives include (1) the characterization of the lithology, texture, and physical properties of the subducting sediments and basement; (2) the rate of subduction erosion and subsidence history of the upper plate; (3) the fluid/rock interactions and geochemical processes active within the upper plate; and (4) the evolution of the stress field upslope.
PREVIOUS SCIENTIFIC DRILLING DURING CRISP EXPEDITION 334 (MARCH-APRIL 2011)
Drilling at upper slope Site U1379 penetrated what appeared to be the sediment/basement interface at the depth predicted by site survey seismic data and cored 80 m into basement, which comprises a breccia of basalt and chert pieces embedded in a sandstone and siltstone matrix. At mid-slope Sites U1378 and U1380 poor hole stability made it impossible to reach basement. Finally, coring at Site U1381 was intended to characterize the physical, geochemical, thermal, and stress state of the Cocos Ridge igneous crust and overlying sediments before they enter the Middle America Trench.Results of this previous CRISP Expedition can be found in the Preliminary Report at the following link:
Expedition 334 Preliminary Report: publications.iodp.org/preliminary_report/334/
PLANNED SCIENTIFIC DRILLING DURING CRISP 2 EXPEDITION 344:
Slope Sites U1378 and U1379: During Expedition 344, the scientific objectives at Site U1378 are to obtain a complete subsidence history and penetrate into basement. Operations will include installation of a reentry system, followed by RCB coring to a depth of 900 meters below seafloor (mbsf), and downhole logging. The scientific objective at Site U1379 is to penetrate deeper into basement. Operations will include drilling without recovery through the previously cored interval (~900 mbsf) and RCB coring to a depth of 1050 mbsf.
Toe Site CRIS-9A: The scientific objectives at margin toe site CRIS-9A are to characterize the material entering the subduction zone from the trench and frontal prism and penetrate the décollement surface between the Cocos and South American plates. Hole A will be APC/XCB cored to 500 mbsf, whereas Hole B will be drilled without recovery to 490 mbsf, RCB cored to 980 mbsf, and logged.
Reference Site U1381: The scientific objective at Site U1381 is to further characterize the sediments overlying the Cocos Ridge igneous crust by APC coring 100 m to the sediment/basement interface.
The original proposals are available at the following links
Proposal 537A-Add: http://iodp.tamu.edu/scienceops/precruise/costarica/537A-Add.pdf
Robert Harris & Arito Sakaguchi
Shipboard scientists from J-DESC
Call for participation
15 Dec., 2011
31 Jan, 2012
Apply now>>Click here
Travel support>> Click here
If you are a student, you need to submit recommendation letter from your supervisor.
If you are a master student, onboard adviser will be needed.
Support for shipboard scientists from J-DESC
J-DESC supports Japan-based IODP shipboard scientists. Applications are required to be submitted to J-DESC support to get any support. Please contact us to get the information.
E-mail: info at j-desc.org