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Successes and Challenges of MT-InSAR Methods in Coastal Regions: A Case Study on the Island of Tutuila, American Samoa | IEEE Conference Publication | IEEE Xplore

Successes and Challenges of MT-InSAR Methods in Coastal Regions: A Case Study on the Island of Tutuila, American Samoa


Abstract:

Multi-temporal InSAR (MT-InSAR) techniques are powerful time-series analysis methods that enable all-weather measurements of surface deformation. However, even advanced M...Show More

Abstract:

Multi-temporal InSAR (MT-InSAR) techniques are powerful time-series analysis methods that enable all-weather measurements of surface deformation. However, even advanced MT-InSAR techniques can produce inaccurate results in challenging environments, including many coastal regions. Here, we describe successes and challenges of applying MT-InSAR techniques for imaging post-seismic vertical land motion (VLM) on Tutuila Island in American Samoa. We tested traditional persistent scatterer (PS) and small baseline subset (SBAS) methods and also designed a customized redundant PS method to address observed inconsistencies in both PS and SBAS analysis. The redundant PS method yielded results with lower noise and more realistic spatial variation compared to PS and SBAS workflows. Our case study emphasizes the importance of careful application of MT-InSAR for measuring VLM along coastal regions, where subsidence and uplift rates may be moderate in the presence of numerous noise sources. In particularly challenging areas, customized approaches may be needed to produce useful solutions.
Date of Conference: 16-21 July 2023
Date Added to IEEE Xplore: 20 October 2023
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Conference Location: Pasadena, CA, USA

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