On 22 December the Anak Krakatau volcano, located about 50 km West of Java, in the Sunda Strait of Indonesia, erupted and partially collapsed. The volcano was reduced from 338 m to the 110 m of height, according to the Indonesia's Center of Volcanology and Geological Hazard Mitigation press release. The undersea landslide caused by the eruption triggered a tsunami which hit the coastal areas around the Sunda Strait between Java and Sumatra islands of Indonesia. As of 28 December, the National Disaster Management Agency reported 426 casualties, over 7,000 people injured and over 40,000 people displaced (ECHO Daily Flash 28 December).
The Copernicus EMS Rapid Mapping component was activated on 23 December to produce emergency maps over several Areas of Interest (AoIs) on the west coast of Java island, the south coast of Sumatra and over the volcano island. Persistent cloud cover hampered the acquisition of optical imagery for almost a week. Only on 29 December Sentinel-2 provided a first visual of the volcano island. The requested maps included one delineation map showing the changes to the Anak Krakatau island area from 288.7 ha to 295.6 ha after the disaster as part of the volcanic island collapsed while the mud and lava flow extended the island in other areas. A first set of the requested grading maps assessing the magnitude of damage – i.e. the flood trace, the number of affected buildings and damage to infrastructure – could be released only one week after the event due to adverse weather conditions. For 10 out of the 12 AoIs on the west coast of Java island and the south coast of Sumatra grading maps were produced from Pleiades imagery mostly provided by the International Charter Space and Major Disasters. Image acquisition for the remaining AoIs continues under Copernicus. Optical satellite imagery is necessary for the production of grading maps for this type of disaster, and satellite radar imagery is not useable. The grading maps produced to this date show ca. 2,230 buildings affected by the tsunami.
The maps and vector data are available for viewing and download on the EMS website: https://emergency.copernicus.eu/EMSR335.
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The AoIs identified for emergency map production (Copernicus EMS © 2019 EU, [EMSR335] Activation Extent Map)
The delineation map of Anak Krakatau shows that the area of the island changed from 288.7 ha (blue line) to 295.6 ha (orange line) after the disaster (Copernicus EMS © 2019 EU, [EMSR335] Anak Krakatau: Delineation Map)
The North Labuhan grading map showing 23.9 ha of flood trace and 641 buildings affected by the tsunami (Copernicus EMS © 2019 EU, [EMSR335] Labuhan North: Grading Map)
Source: EMS Information Bulletin