The 2018 Lombok Island, Indonesia Earthquake: Crustal deformation detected by ALOS-2 data
Crustal Deformation Observed by Synthetic Aperture Radar (SAR)Released: Jul. 31, 2018, updated: Aug. 30, 2018, Japanese version of this page
Summary[Update on August 30, 2018]
An earthquake (Mw 6.9, USGS) occurred in Lombok island, Indonesia on August 19, 2018 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 data. The analysis result shows that the crustal deformation occurred in the northern part of the island. [Update on August 17, 2018] An earthquake (Mw 6.9, USGS) occurred in Lombok island, Indonesia on August 5, 2018 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 data. The analysis result shows that the crustal deformation occurred in the northern part of the island. [Update on July 31, 2018] An earthquake (Mw 6.4, USGS) occurred in Lombok island, Indonesia on July 28, 2018 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 data. The analysis result shows that the crustal deformation occurred in the northern part of the island. SAR InterferogramsFig.1 SAR interferogram [PNG: 1.4MB] ※We applied the Split Spectrum method (Gomba et al.,2016) to reduce the ionospheric noise. Figure4-a shows the image before the noise reduction processing. Fig.2 SAR interferogram [PNG: 1.5MB] ※We applied the Split Spectrum method (Gomba et al.,2016) to reduce the ionospheric noise. Figure4-b shows the image before the noise reduction processing. Fig.3 SAR interferogram [PNG: 1.5MB] ※We applied the Split Spectrum method (Gomba et al.,2016) to reduce the ionospheric noise. Figure4-c shows the image before the noise reduction processing. Fig.4-a [PNG: 1.5MB] Fig.4-b [PNG: 1.5MB]Fig.4-c [PNG: 1.4MB] Fig.4 SAR interferogram(before the ionospheric noise reduction)
*1 W: ScanSAR (Normal) (cf. ALOS-2 Project / PALSAR-2 (JAXA)) Analysis by GSI from ALOS-2data of JAXA. These results were obtained through the activity of the SAR analysis working group of the Coordinating Committee for Earthquake Prediction. The 2018 Lombok island Indonesia Earthquake
Fig. 5. Deformation predicted by CMT solution (Mw=6.4 July 28)[PNG: 1.7MB] SatelliteALOS-2 (Advanced Land Observing Satellite 2) launched by Japan Aerospace Exploration Agency on May 24, 2014
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