Vulcanian eruption from Semeru volcano on 19 Dec (image: PVMBG)
Vulcanian-type eruptions continue to take place from Jonggring Saloko crater at roughly regular intervals every 15-30 minutes. Grey ash plumes rose about 500-700 meters above the crater, throwing lava bombs in various directions.
The volcano observatory reported a seismic signal with a maximum amplitude of 22 mm and a duration of 100 seconds.