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Summary of Proposal GEO2309

TitleCrustal Deformation in Southwest Bolivia
Investigator Farrell, Alexandra - University of South Florida, School of Geosciences
Team Member
Ms. Farrell, Alexandra - University of South Florida, School of Geosciences
Ms. McFarlin, Heather - University of South Florida, School of Geosciences
Dr. Dixon, Tim - University of South Florida, School of Geosciences
Dr. McNutt, Steve - University of South Florida, School of Geosciences
SummaryWe propose an investigation of the ground deformation rates surrounding Uturuncu Volcano in Bolivia. Recent InSAR studies of this area using ERS-1, ERS-2, and Envisat show an inflation rate of 1.5-2 cm/yr and a signature of 70 km in diameter (Pritchard and Simons, 2002). The source of the inflation, the Altiplano-Puna Magma Body (APMB), was modeled with a Mogi model and was found to be at a depth of 15-17 km. We aim to provide better constraints on the depth, size, and shape of this inflation source by modeling the TerraSAR-X data using a coin-shaped source model. The newer, higher-resolution data offered to scientists by TerraSAR-X will provide us with the latest and best data available to date of our proposed research area. With this data, we will be able to provide not only a better overall idea of what is happening in the Bolivian Altiplano around Uturuncu, but we will also be able to model with greater accuracy smaller spatial and temporal changes in the vicinity. Also, because of the regularity with which SAR satellites can image this locale, we will have a long-term, regular dataset which otherwise does not exist in this remote and understudied region. During the time period in which TerraSAR-X data overlaps other PLUTONS datasets (April 2009 to April 2013), we can determine if there is any relation between deformation and other studied parameters, such as shallow seismicity. Once we have acquired the requested data, we will use the software package Doris to analyze the data. We will model the inflation source as coin-shaped because preliminary seismic analyses performed by Ms. Farrell and Ms. McFarlin suggest that a sill-like zone of attenuation is the dominant structure under Uturuncu. We request data from the Southwestern Bolivian Andes region. Ideally, we would prefer to obtain one scene per month for a period of about four years, from April 2009 to April 2013; but this will, of course, depend on the cost per frame. This time frame would cover four annual cycles, which would be long enough to characterize and correct for any annual signals present inthe data. If possible, we would like all of our scenes to be either from ascending orbits or descending, and not a mix of the two. We also request the scenes to be in the SLC format. The final results of our analyses will be two term papers on the processing and interpretation of the proposed TerraSAR-X data, each detailing a different time period. This will provide a continuous, long-term study of deformation in this region as well as provide insights into processes occurring at the APMB. The funding for this project will come from the PLUTONS project, which is funded by the National Science Foundation Continental Dynamics Program and the Natural Environment Research Council.

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