Science Service System

Summary of Proposal MTH1803

TitleModeling 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
Team Member
Geologist Barrientos, Alejandro - National Institute of Statistics and Geography (INEGI), Geology and Physiography
LMA Castaneda, Laura - National Institute of Statistics and Geography (INEGI), Geodetic Evaluation
Summary

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.


MAIN OBJECTIVES

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.


SPECIFIC OBJECTIVES
  • Investigation on existing methods for horizontal displacement detection from SAR data.
  • Detection of horizontal displacements due to subsidence using TerraSAR-X data.
  • Detection of horizontal displacements triggered by earthquakes.
  • Development of a procedure for horizontal displacement estimation.
  • Mapping of areas affected by subsidence with SAR interferometry.
  • Integration of geodetic data and SAR interferometry results to obtain subsidence maps.
  • Detection or prediction of new ground failures using interferograms and applying the gradient to unwrapped interferograms.
  • Development of vertical and horizontal displacement models for geodetic network adjustment.
  • Testing of models.

METHODS

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.


FUNDING

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.


DELIVERABLES
  • Models and maps of horizontal displacements caused by earthquakes.
  • Maps of horizontal displacement due to subsidence.
  • Model and maps of vertical displacement due to subsidence.
  • Maps of new ground failures previously undetected.
  • Maps of predicted ground failures.

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DLR 2004-2016