Potentially affected areas by pyroclastic flow/deposits after the December 2022 Mount Semeru volcanic eruption in East Java.

**UNOSAT code VO20221206IDN, GDACS Id: 1000057** This map illustrates the potentially affected areas by pyroclastic flow/deposits of the December 2022 Semeru mount eruption in East Java (Indonesia) as detected by satellite images acquired on 4 Dec 2022 10km SE Mount Semeru. Based on analysis of Worldview-3, Spot 6 and Sentinel-2 images acquired on 9, 11 & 12 Dec. 2022 respectively, about 460ha of land appear to be severely affected by the volcanic eruption induced effects in the analyzed area of about 2,000ha. Within this area, UNOSAT has identified 206 affected structures and 10 potentially affected structures. Based on Worldpop population data and affected area by the pyroclastic flow/deposit, about 1,500 people are potentially exposed in this zone. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code VO20221206IDN, GDACS Id: 1000057** Live web map providing geospatial information potentially affected areas by pyroclastic flow/deposits after the December 2022 Mount Semeru volcanic eruption in East Java. This web map gives an updated overview over potentially affected structures and affected structures based on very high-resolution satellite images and also Pyroclastic flow/deposits.

**UNOSAT code: VO20211205IDN** This map illustrates the potentially affected areas by Lahar and Pyroclastic density currents (PDCs) including geological information of Mount Semeru, Java province, Indonesia as detected by satellite images acquired after the eruption of the Mount Semeru on 4 Dec 2021. UNITAR-UNOSAT analysis used Pleiades images acquired on 10 & 11 Dec 2021 to estimate the affected area by Lahar and Pyroclastic density currents. Within the analyzed area, about 3,220 ha appear to be affected. Based on Worldpop population data and affected area by Lahar and pyroclastic density currents, about 8,400 people are potentially exposed or living close to pyroclastic density area. In addition, base on Esri 2020 Land Cover, potentially affected in tree area ~2,100ha, scrub/shrub area ~ 400 ha, cropland ~ 165 ha, built area ~ 140 ha. Important note: Pyroclastic density currents (PDCs) are perhaps the most hazardous events to local areas during explosive volcanic eruptions. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

# EOS-RS Damage Proxy Map: East Java, Indonesia, Volcanic Eruption, 24 Nov 2025, v0.9 The Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS) created this preliminary Damage Proxy Map (DPM) depicting areas that are likely damaged on Java, Indonesia, due to a volcanic eruption from the Semeru volcano on 19 Nov 2025. This map was derived from synthetic aperture radar (SAR) images acquired by the Copernicus Sentinel-1 satellite operated by the European Space Agency (ESA) before (21 Jun 2025 to 23 Oct 2025) and after (24 Nov 2025) the event. The map covers an area indicated by the white polygon. Damage is shown by colored pixels of 30m in size, where yellow to red indicates increasingly significant ground surface change before and after the event. Preliminary validation was conducted using news reports and ground-level imagery and videos in selected areas. This map should be used as a guidance to identify damaged areas, and may be less reliable over vegetated or mountainous areas. Scattered pixels over vegetated or mountainous areas may be false positives, and a lack of colored pixels over such areas may not mean no damage. This product contains modified Copernicus Sentinel data (2025), processed by ESA and analyzed by the Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS). **More map details and files:** **Legal Disclaimer:** **Credits:** Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS), Contains modified Copernicus Sentinel data (2025)

# Indonesia Semeru Volcano: Damage Proxy Maps, Dec 2021 The **Earth Observatory of Singapore – Remote Sensing Lab (EOS-RS)** produced these damage proxy maps for Indonesia Semeru Volcano (Dec 2021) from synthetic aperture radar (SAR) satellite images. Each map is a separate ZIP below with its GeoTIFF, a KMZ for Google Earth, the PNG figures and a text file describing how it was made and how to read it. ## Maps in this dataset - **EOS-RS Pyroclastic flow extent map: Indonesia, Semeru volcano, 5 Dec 2021, v0.4** - **Peta kerusakan EOS-RS: Erupsi Gunung Semeru, Indonesia, Dec 2021, v0.9** - **Peta kerusakan EOS-RS: Erupsi Gunung Semeru, Indonesia, Dec 2021, v0.9** - **Peta kerusakan EOS-RS: Erupsi Gunung Semeru, Indonesia, Dec 2021, v0.8** (superseded) - **Peta kerusakan EOS-RS: Erupsi Gunung Semeru, Indonesia, Dec 2021, v0.8** (superseded) **More map details and files:** **More map details and files:**

**UNOSAT code: VO20210523COD** This map illustrates potentially affected structures and buildings in Nyiragongo district, Nord-Kivu province, DR Congo as detected by satellite image acquired after the 22 May 2021 Nyiragongo volcanic eruption. UNITAR-UNOSAT analysis used a Sentinel-1 image acquired on 25 May 2021, at 16:21 UTC, to extract the lava flow extent. Within the map extent, about 1,722 structures and the road about 18 km are potentially affected by the lava flow. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT.