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Summary of Proposal GEO0882

TitleModeling of seismic induced deformation in South-East Asia detected by GPS and InSAR
Investigator Simons, Wim - Delft University of Technology, Faculty of Aerospace Engineering
Team Member
Ir. Simons, Wim - Delft University of Technology, Astrodynamics & Space Missions
Dr Moreira de Sousa, Joaquim - University of Trás-os-Montes e Alto Douro, Department of Engineering
Prof. Hooper, Andy - University of Leeds, School of Earth and Environment

We intend to carry out a detailed combined GPS and InSAR geodetic analysis followed by geophysical modeling of the present crustal fault deformations in and around Palu, provincial capital of Central Sulawesi, Indonesia. Our exclusive GPS database (1994-present) will provide important input to this study, as it provides good spatial coverage of this region (including Palu-Koro fault transects). The already available GPS displacements will be used in new InSAR techniques (image stacking) to create denser deformation maps of this specific area. Additional GPS analysis will improve the estimation of (previous 2005 and 2009) instantaneous co-seismic displacements while available pre-quake GPS results (1994-2004) are used to estimate the steady-state crustal motion. Finally, a new deformation model for the Palu region will be derived that also assesses possible future earthquake scenarios. Finally we will study any ongoing slow landslide events as suggested by the latest GPS results.

Data are requested in StripMap mode Single Look Slant Range Complex data for this project. We ask for scenes in both ascending and descending orbital passes, in order to observe different components of deformation (along different lines of sight), and to have independent observations. We will compare both the area over which we are able to extract a well-correlated deformation signal, and the accuracy of the extracted signal to that of Envisat ASAR and available ground truth. Two SLC scenes are needed to cover our area of interest (centred at latitude -0.91° N and longitude 119.93° E) in both ascending and descending (last one is most favourable due to the direction of the ongoing deformation) geometries, and we require up to 40 acquisitions of each scene. This would result in up to 160 images in total.

Deliverables include a minimum of two scientific articles describing the combined interferometric and GPS analyses and their constraints on deformation processes. Annual reports to DLR and yearly presentations at international scientific conferences will also be delivered.

The participating institutions involved will cover the salary costs of the team. An exception is that of Wim Simons, which will be supported by The Netherlands Organization for Scientific Research project no. ALW-GO-AO/10-13. This project will also fund computer facilities, travel to (joint work) meetings and of course the above proposed TerraSAR-X data acquisition.

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