Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT54] Synthetic Aperture Radar

Sun. May 22, 2016 10:45 AM - 12:15 PM A05 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yosuke Miyagi(National Research Institute for Earth Science and Disaster Prevention), Tsutomu Yamanokuchi(Remote Sensing Technology Center of JAPAN), Yu Morishita(Geospatial Information Authority of Japan), Chair:Kazuya Ishitsuka(Fukada Geological Institution), Tsutomu Yamanokuchi(Remote Sensing Technology Center of JAPAN)

11:00 AM - 11:15 AM

[STT54-08] InSAR measurement of ground subsidence at permafrost areas: preliminary results

*Masato Furuya1, Kento Iio2 (1.Department of Earth and Planetary Sciences, Hokkaido University, 2.Department of Natural History Sciences, Hokkaido University)

Keywords:permafrost, InSAR, thermokarst, ground subsidence, ionosphere

Permafrost thawing due to global warming can not only change any local hydrological and biological systems but also generate methan gasses that could further contribute to enhance gobal warming. Moreover, ground subsidence associated with permafrost thawing is another natural hazard to social infrastractures such as roads and pipelines in high-latitude regions. However, a comprehensive mapping of on-going permafrost thawing and refreezing is challenging, because of their remote and wide spatial coverage.
Liu et al. (2015, JGR-ES) suggested that satellite synthetic aperture radar interferometry (InSAR) could reveal on-going subsiding signals around thermokarst, which could tell us the dynamic processes and thus the mechanisms responsible for on-going permafrost thawing, using satellite remote sensing.
Meanwhile, at Yamal Peninsula, northern Siberia, four caldera-like collapsed topographies were discovered, whose maximum diameter and depth reach 37 meter and 70 meter, respectively. These sudden collapses are attributed to the rapid thawing of permafrost due to the anomalously high air-temperature in recent years.
Given these backgrounds, we have performed InSAR measurements over Yamal Peninsula to examine if any ground deformation has been on-going. We will report and disucss our preliminary results and isssues.