View is northeast toward Pu`u `O`o before a series of collapse pits had
formed on its west flank.
Photograph by C. Heliker on August 1,
1997
The wide gap in the west flank of Pu`u `O`o developed on January 29,
1997, when magma moved from beneath the cone to Napau Crater, about 4 km
uprift. Note the growth of the shield since 1992 and the prominent episode-55 spatter cone
that began to erupt on March 28, 1997.
Photograph by C. Heliker on October 5,
1999
The episode-55 spatter cone began to collapse in August 1998. By
April 1999, a pit 60 x 100 m in diameter had largely consumed the spatter
cone.
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Updated: 18 May 2000