Interferometric Synthetic Aperture Radar (InSAR) is a powerful method for the quantitative measurement of surface deformation. InSAR provides vital clues pertaining to the mechanism of the Earth’s surface activities, such as earthquakes, volcanic activities, tectonic movements, and ground subsidence, to name a few. Despite the high use of InSAR in geologic researches, this method has the main weakness that it can only measure the surface movement along the antenna’s line-of-sight (LOS) direction.
However, a better understanding of surface deformation sources through geophysical models requires three-dimensional (3D) surface deformation maps. Multiple aperture interferometry (MAI) which can measure the satellite's along-track deformation enables us to retrieve the precise 3D displacements by integrating InSAR and MAI measurements.
This study focuses on investigating i) how precisely can we measure 3D displacements of surface deformation and ii) how much can we improve geologic models by using the precise 3D displacement maps. Studies on KÄ«lauea Volcano, Hawai`i and the South Napa earthquake will be discussed.
About the Speaker:
Min-Jeong Jo received her M.S. and Ph.D. degrees in radar remote sensing from from Yonsei University, Seoul, Korea, in 2009 and 2015. She is currently a postdoctoral researcher at the Yonsei University. Her research interests include investigating time-series surface deformation by multi-temporal SAR images and retrieving precise three-dimensional displacements of surface deformation by the integration of interferometric SAR (InSAR) and multiple-aperture InSAR (MAI) measurements. Her major application field focuses on active volcanoes, seismic events, and ground subsidence areas.