InSAR time series analysis of the 9 July 1998 Azores earthquake
The 9 July 1998 M w 6.1 Pico-Faial earthquake was one of the largest events recorded in the Azores (North Atlantic) in recent years. It generated significant co-seismic deformation that was captured by a GPS network on Faial Island. On the other islands, where no such networks were available, the co...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.8729 http://perso.numericable.fr/%7Efeigkurt/CatitaEtAl2005IJRemSense.pdf |
| Summary: | The 9 July 1998 M w 6.1 Pico-Faial earthquake was one of the largest events recorded in the Azores (North Atlantic) in recent years. It generated significant co-seismic deformation that was captured by a GPS network on Faial Island. On the other islands, where no such networks were available, the co-seismic surface displacement field was heretofore unknown. To measure it on Pico Island, we analysed Synthetic Aperture Radar (SAR) images using interferometry. Our dataset includes 17 images acquired by the ERS-1 and ERS-2 satellites in descending passes between June 1992 and November 2000. The interferograms computed from the available image pairs show poor correlation, particularly over the dense vegetated area of Faial Island and the flanks of Pico Volcano. However, a well-correlated fringe pattern remains over 33 months for barren parts of NW Pico Island. We analysed phase profiles across this fringe to distinguish the relative contributions of the co-seismic signal and the tropospheric noise, observing a co-seismic step of 29¡10 mm in range. |
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