선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- In particular, we confirmed an abrupt uplift and subsidence of the surface through GPS observation. By observing the change in baseline distance across the crater, we divided the observation period into five stages, with each stage showing a different surface displacement pattern. Second, the surface displacement patterns observed by GPS and SAR imaging have in general stabilized after the 2006 eruption.
- The GPS observation data were then applied with the SBAS algorithm for a time-series analysis based on SAR images. By taking into account the features of SAR images that are not capable of creating differential interferometry images when large displacements such as volcanic eruptions occur suddenly, the data were analyzed by breaking down the period into pre and posteruption stages. The results are summarized as follows.
- Even when interferograms can be created, it is easy for the irregularly occurring displacements in wide-ranging areas like a volcanic eruption to be excluded from analysis. For this reason, this study conducted a time-series analysis by dividing it into pre-eruption and post-eruption, with separate displacement distribution diagrams for the entire observation period including both pre- and post-eruption.
- Surface displacement patterns were analyzed before and after the 2006 eruption of Augustine volcano of Alaska as a way to determine precursor signs before an eruption, post-eruption earth crust changes, and prediction of a major eruption. To complement the limitations of one approach with another, GPS and InSAR techniques were used and observed surface displacements occurring between 2003 and 2011.
- , 2002). This research alert us to important information of symptom for volcanic eruption through quantitative analysis from time-series surface deformation using GPS and InSAR techniques.
대상 데이터
- When selecting a reference point, one stable observation point was chosen near the island that had been run for a long time, understanding that the greater its distance from the volcano, the higher the margin of error. The AC59 station that had been used since September 2004 was selected. It is located on the North American plate about 24.
- To measure the degree of surface displacement at Augustine volcano through InSAR, ENVISAT data were acquired, the radar satellite operated by the ESA(European Space Agency). The data were collected include 22 images in 2229 tracks dated from June 2003 to August 2010 (Table 1).
- In this study, surface displacements were monitored and analyzed before and after the 2006 event. To that end, GPS data were collected between January 2005 and December 2011 from 13 permanent GPS observation points installed in Augustine volcano by the PBO(Plate Boundary Observatory). All data thus collected are 30-second-interval 24-hour observations in the RINEX(Receiver Independent Exchange Format) format provided by the FTP server of UNAVCO.
이론/모형
- To that end, the permanent GPS data were collected between the years 2004 and 2011, as well as the ENVISAT SAR image data between 2003 and 2010 for time-series analysis of the observed data. The GPS observation data were then applied with the SBAS algorithm for a time-series analysis based on SAR images. By taking into account the features of SAR images that are not capable of creating differential interferometry images when large displacements such as volcanic eruptions occur suddenly, the data were analyzed by breaking down the period into pre and posteruption stages.
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