| NSF Org: |
EAR Division Of Earth Sciences |
| Recipient: |
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| Initial Amendment Date: | April 23, 2010 |
| Latest Amendment Date: | April 23, 2010 |
| Award Number: | 1036065 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Eva Zanzerkia
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
| Start Date: | May 1, 2010 |
| End Date: | April 30, 2012 (Estimated) |
| Total Intended Award Amount: | $199,996.00 |
| Total Awarded Amount to Date: | $199,996.00 |
| Funds Obligated to Date: |
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| History of Investigator: |
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| Recipient Sponsored Research Office: |
2425 CAMPUS RD SINCLAIR RM 1 HONOLULU HI US 96822-2247 (808)956-7800 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
2425 CAMPUS RD SINCLAIR RM 1 HONOLULU HI US 96822-2247 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): |
Tectonics, Geophysics, International Research Collab |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
In rapid response to the Feb.27, 2010 M 8.8 Maule earthquake in Chile, investigators at multiple institutions, coordinated through the University of Hawaii will install 20 continuous GPS stations, siting stations along the rupture length by using slip distribution models to widely and most effectively instrument the active areas. Fieldwork will be lead by Mike Bevis, Ohio State University, coordinating with Sergio Barrientos at the University of Chile and the Instituto Geografico Militar de Chile. Data will be incorporated into finite-source slip inversions and publicly posted. The raw GPS data will also be made available either by manual download or in near real-time through satellite downlink.
The intellectual merit of the project are wide ranging. The PIs cite tectonic problems that may be addressed using this broad array, including understanding the coseismic displacement field of the earthquake, which will help to constrain fault rupture and tsunami models, examining the role of stress loading on the mainshock and ancillary faults, observing afterslip and spatio-temporal distribution of aftershocks, using high-rate GPS and understanding the rheological and mechanical behavior of the subduction zone and surrounding region in response to the earthquake.
The Broader Impacts include support for a large international collaboration including scientists from Chilean and French institutions, as well as support for PIs from the University of Hawaii, Ohio State, University of Memphis and Caltech. The project will produce an open archive of GPS data collected from this project as well as data acquired by the French. All data will be made openly available as soon as it is collected through UNAVCO. The data collected will be useful for a broad range of domains, including geodetic studies, structural engineering and oceanography.
This award is supported by the Tectonics and Geophysics programs in the Division of Earth Sciences (GEO/EAR) and the Office of Interational Science and Engineering, Americas Program.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
On 27 February 2010 the M 8.8 Maule earthquake devastated a large portion of south-central Chile. Within 2 months of the earthquake, our team, with NSF support, had installed 33 new continuous GPS (CGPS) stations in Chile. The Maule event caused near-field peak horizontal motions in excess of 5m and static co-seismic displacements were measurable over ~ 1/3 of continental South America. These large co-seismic displacements suggested that large, transient, post-seismic displacements would also be measureable, giving us the opportunity to study both the frictional character of the co-seismic fault plane as well as the response of the South American crust and mantle.
Our team has found that the zones of maximum post-seismic fault slip near Chile's Arauco peninsula corresponds both with the northern boundary of the M9.4 1960 Valdivia earthquake (the largest in recorded history) and with large subduction zone parallel positive gravity anomalies. This is consistent with the notion that the Arauco peninsula region acts as a long term (million year time-scale) rupture boundary. Additionally, we find that the data suggest the possibility that fault afterslip could be occurring as deep as 80km along the subducting Nazca plate.
All of the data from the stations we have installed, many with satellite and cell phone modem connections, are publicly available in real-time or near real-time from the UNAVCO data portal.
Last Modified: 08/05/2012
Modified by: Benjamin A Brooks
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