The Taal volcano in the Philippines continued erupting on Thursday, albeit with less of the ash production seen earlier in the week.
Scientists are monitoring the situation remotely, using ground and space instrumentation, to try to gauge what might happen next.
The radar image on this page is the latest to come down from the Iceye radar constellation .
The Finnish system senses in the microwave portion of the electromagnetic spectrum, which gives it the ability to see through ejected ash and any cloud to detect directly the hard surface below.
The data reveals how the lake that once filled the Taal crater has now almost completely disappeared.
It was the interaction of this water with magma that drove a lot of the early explosive behaviour.
The dashed line shows the extent of the lake before the onset of Sunday’s eruption phase. The solid line traces the waterline at the time of Thursday’s image acquisition.
After the phreatomagmatic eruption of 12 January, check out this #Sentinel1 🇪🇺🛰️ #InSAR interferogram of the #TaalVolcano which shows significant ground deformation
Each colour fringe corresponds to 2.8 cm of ground displacement along the 🛰️LOS
Processed with @esa_gep pic.twitter.com/VCHWxUg9ws
— Copernicus EMS (@CopernicusEMS) January 16, 2020
Other radar satellites are looking at how the ground is deforming around the volcano.
The EU’s Sentinel-1 spacecraft are able to do this by stacking repeat images one on top of each other.
This interferometric technique will help scientists understand how magma is shifting below the volcano and what that might mean for future activity.
Philippine authorities have been struggling to keep some of the 50,000 residents evacuated from the area from trying to return to their homes to gather possessions and to check on livestock.
“Please allow us to observe the lull period for now. We are studying what that means,” Maria Antonia Bornas, a scientist from the Philippines’ seismology agency, told reporters.