Posted: Mar. 26, 2018, 9:00 (UTC)
|Observation time（UTC）||Orbital No.||Mode||Orbit||Direction||Beam No.|
|(1)||3:18, Jan. 22, 2018||23||Stripmap||Des.||Right||U2-7||(2)||3:18, Mar. 5, 2018||23||Stripmap||Des.||Right||U2-7||(3)||14:30, Mar. 6, 2018||124||Stripmap||Asc.||Left||U3-11||(4)||3:04, Mar. 9, 2018||21||Stripmap||Des.||Right||U3-13||(5)||3:25, Mar. 10, 2018||24||Spotlight||Des.||Right||-||(6)||14:16, Mar. 10, 2018||122||Spotlight||Asc.||Left||-||(7)||14:36, Mar. 11, 2018||125||Stripmap||Asc.||Left||U2-8||(8)||3:11, Mar. 14, 2018||22||Stripmap||Des.||Right||U3-10||(9)||14:23, Mar. 15, 2018||123||Stripmap||Asc.||Left||U3-14|
|Observation time（UTC）||Mode||Orbit||Direction||Beam ID||Satellite No.|
|(1)||20:12, Mar. 7, 2018||Spotlight||Asc.||Left||24||S2||(2)||8:53, Mar. 8, 2018||Spotlight||Des.||Right||23||S1||(3)||21:12, Mar. 9, 2018||Spotlight||Asc.||Right||27||S4||(4)||22:56, Mar. 10, 2018||Spotlight||Asc.||Left||17||S1||(5)||8:59, Mar. 11, 2018||Spotlight||Des.||Right||16||S2||(6)||8:59, Mar. 12, 2018||Spotlight||Des.||Right||16||S3||(7)||8:59, Mar. 15, 2018||Spotlight||Des.||Right||16||S4||(8)||8:59, Mar. 19, 2018||Spotlight||Des.||Right||16||S1|
Figure 2 shows the observation images around the crater of Shinmoedake by ALOS-2. These images were acquired from eastern side of Shinmoedake. Comparing with the image on (1) Jan. 22, we confirmed some changes in the crater in the image on (2) Mar. 5, and a lava dome was formed on (3) Mar. 6. The dome had enlarged time by time, and the lava flowed out to the northwest direction on (5) Mar. 10. The dome continued to get larger and it covered almost all of the crater on (9) Mar. 15. You can see how the dome has been developed by animation on Fig. 3.
Figure 4 shows the observation images around the crater of Shinmoedake by COSMO-SkyMed. COSMO-SkyMed uses X-band microwave (wavelength: 3.1 cm) and we can clearly recognize the outline of the lava dome and the surface striped patterns. Comparing observation image on March 15 with that on March 19, we confirm the lava which flowed out into crater outside still flows and the lava dome has been enlarging. Fig. 5 is an animation composed of the latest three COSMO-SkyMed images. You can see the enlargement of lava done more clearly.
Figure 6 shows the lava movement in the crater derived from pixel offset (or offset tracking) technique. The pixel offset is a robust method to detect localized large displacement at precise coregistration of two images. Applying this method to COSMO-SkyMed images acquired on Mar. 11 and Mar. 12, approx. 12 m along range (i.e. west) direction and approx. 15 m along azimuth (i.e. south) direction were detected. This movement is recognized in the animation in Fig. 5.
Figure 7 also shows the lava movement derived from COSMO-SkyMed images acquired on Mar. 15 and Mar. 19. Approx. 15 m along range (west) direction and approx. 20 m along azimuth (south) direction were detected during four days, indicating the developing rate of the lava dome has been decreasing.
We will continue to monitor Shinmoedake by ALOS-2.
© JAXA EORC