As of 13 April, seismicity at Raoul Island had returned to normal and Green Lake's water level was dropping. Raoul Island remained at Alert Level 2 (minor eruptive activity).

Seismicity continued to decline at Raoul Island through 7 April. In addition, Green Lake's water level began to recede, ending the water-level increase that had occurred in response to the 17 March eruption.

After the 17 March eruption at Green Lake on Raoul Island, no new eruptions occurred and seismicity declined through 24 March. New Zealand scientists found that many new craters had formed in and around Green Lake and that pre-existing 1964 craters had eactivated. The main steam columns were derived from Crater I, Marker Bay, and Crater XI. The eruption blew over mature trees as far as 200 m from the eruption site and deposited dark gray hydrothermal mud and ballistic blocks.

The Green Lake crater of Raoul volcano on Raoul Island (one of the remote Kermadecs Islands group in the South Pacific, located 625 miles northeast of New Zealand's city of Auckland) erupted early Friday, 17 March 2005. The eruption lasted about 30 minutes and was probably a series of phreatic explosions, throwing debris, ash and vapour out of the lake-filled crater.