Visualization of volcanic hazards
Detailed Description
A USGS IT Specialist presents a visualization of volcanic hazards derived via satellite radar systems. IT systems facilitating the swift and accurate production of such solutions will be vital to the success of NVEWS. USGS image.
The background image shows a Synthetic Aperture Radar (SAR) Volcanic Flow Map (VFM). This map combines cross-polarized radar amplitude images taken on two different dates, along with interferometric coherence from the time between those dates. This approach enables the detection of volcanic mass flows (such as lava flows) and other tephra-fall deposits regardless of surface or weather conditions.
The SAR VFM is created using SAR data from the COSMO-SkyMed Second Generation (CSG) satellite constellation, covering the period from March 27, 2025, to April 4, 2025. It highlights Kīlauea summit eruption episode 16 (March 31-April 2, 2025) lava flows located on the caldera floor, as well as tephra deposits to the west of the caldera. In the VFM unchanged barren areas are represented in blue/purple, vegetated areas appear in yellow/light green, and new deposits over barren land are shown in either dark or bright green.
The CSG data used to create this map were provided by the Italian Space Agency (Agenzia Spaziale Italiana , ASI).
Sources/Usage
Public Domain.