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|TanDEM-X Science Service System|
|Title||Modeling horizontal displacements caused by earthquakes for epoch corrections to geodetic networks and detection of horizontal displacements due to subsidence.|
|Investigator||Esquivel, Ruben - Instituto Nacional de Estadistica y Geografia (INEGI), Geodetic Processing|
Ground deformations in Mexico due to tectonics and other effects such as volcanism and subsidence significantly affect the geodetic networks and induce inconsistencies in the geodetic reference frames. Besides to the evaluation of areas affected by earthquakes, InSAR based models for horizontal displacements due to earthquakes may help to maintain the consistency of the geodetic networks through the application of time displacement corrections.
Horizontal displacements related to subsidence use to be smaller than vertical ones and those triggered by earthquakes, but its detection may also help to a better knowledge of subsidence phenomena and ground failure prediction.
1. To develop a procedure for detection and modeling of horizontal displacements caused by earthquakes.
2. Evaluation of the use of TerraSAR-X data to detect, map and model horizontal displacements due to subsidence.
Use ofimage correlationand SAR differential interferometry will be used to obtain horizontal displacements. We will investigate other existing methods in order to assess a combination of them.
SAR differential interferometry will be used to detect vertical displacements.
Existing GPS and other geodetic data will be used to validate/calibrate ground displacements to get final subsidence maps and models.
Evaluation of models will be made by means of least squares adjustment of geodetic data obtained in different epochs.DATA REQUIREMENTS
1. 6 Archived TerraSAR-X Interferometric ScanSAR products (SSC) for the study area (Mexico Basin).
2. 6 Archived TerraSAR-X Interferometric Stripmap (SSC) products for the study area (Mexico City).
3. GPS available data and other geodetic data.
No funding requirement is considered for this project. Equipment is provided by INEGI. In case of funding requirement, it will be also provided by INEGI.
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