Last Updated : May 14, 2018

The 2018 Kilauea volcanic activity of Hawaii: SAR analysis result by ALOS-2 data

Crustal Deformation Observed by Synthetic Aperture Radar (SAR)

Released: May. 9, 2018, updated: May. 14, 2018, Japanese version of this page

Result of Analysis

Fig1.Descending InSAR
Fig. 1. Descending SAR interferogram [PNG: 1.3MB]

Fig2.Ascending InSAR
Fig.2. SAR interferogram [PNG: 1.3MB]

Fig2.Ascending MAI
Fig.3. MAI [PNG: 1.4MB]
Fig. Area 
Area of interest

Fig. Date Time Flight Beam Obs. Incidence Angle Bperp KMZ
# (UTC) Dir. Dir. Mode*1 *2 (around epicenter)
1 2018/01/20 2018/05/12 22:09 Des. Right W-W 45-49° -217m 0.5MB
2 2018/2/27 10:22 Asc. Right F-F 35° -211m 1.0MB

*1 F: Fine (10m), *2 W: Normal
(cf. ALOS-2 Project / PALSAR-2 (JAXA))

Analysis by GSI from ALOS-2 data of JAXA.
These results were obtained through the activity of the SAR analysis working group of the Coordinating Committee for Earthquake Prediction.

Model Calculation

 Fig.3. Calculated crustal defomation and residual : SAR interferogram

Fig.4. Calculated crustal defomation and residual : MAI
Table1. Parameters of the estimated model
Lon Lat Dep Length Width Strike Dip Open Volume
(°) (°) (km) (km) (km) (°) (°) (m) (m3
-154.925 19.455 0.1 7.4 1.7 60 90 3.9 4.9×107
※A uniform opening of a vertical dike is assumed for the model calculation

                           Fig.5. Schematic View


ALOS-2 (Advanced Land Observing Satellite 2) launched by Japan Aerospace Exploration Agency on May 24, 2014

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YARAI Hiroshi : Head of Division
KOBAYASHI Tomokazu : Chief Researcher