Surface deformation caused by an intrusion and small eruption during June 1719, 2007, along the East Rift Zone of Kilauea Volcano, Hawaii, was three-dimensionally reconstructed from radar interferograms acquired by the Advanced Land Observing Satellite (ALOS) phased-array type L-band synthetic aperture radar (SAR) (PALSAR) instrument. To retrieve the 3-D surface deformation, a method that combines multiple-aperture interferometry (MAI) and conventional interferometric SAR (InSAR) techniques was applied to one ascending and one descending ALOS PALSAR interferometric pair. The maximum displacements as a result of the intrusion and eruption are about 0.8, 2, and 0.7 m in the east, north, and up components, respectively. The radar-measured 3-D surface deformation agrees with GPS data from 24 sites on the volcano, and the root-mean-square errors in the east, north, and up components of the displacement are 1.6, 3.6, and 2.1 cm, respectively. Since a horizontal deformation of more than 1 m was dominantly in the north-northwestsouth- southeast direction, a significant improvement of the northsouth component measurement was achieved by the inclusion of MAI measurements that can reach a standard deviation of 3.6 cm. A 3-D deformation reconstruction through the combination of conventional InSAR and MAI will allow for better modeling, and hence, a more comprehensive understanding, of the source geometry associated with volcanic, seismic, and other processes that are manifested by surface deformation.
Bibliographical noteFunding Information:
Manuscript received July 22, 2009; revised November 25, 2009, January 30, 2010, and March 22, 2010; accepted May 24, 2010. Date of publication July 8, 2010; date of current version December 27, 2010. This work was supported in part by the National Space Lab Program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology (M105DA000004-08D0100-0011A), by the NASA Earth Surface and Interior Program (2005-0021), by the USGS Volcano Hazards Program, and by the USGS Land Remote Sensing Program.
All Science Journal Classification (ASJC) codes
- Geotechnical Engineering and Engineering Geology
- Electrical and Electronic Engineering