Photo looking N of the explosive vent that opened on September 26 after two days of nearly continuous seismic activity. To the right of the ~197 ft-wide vent lies a 656 ft-wide, 2.5 mile-long zone of open fissures and normal faults that may mark the subsurface location of the dyke. The fault zone continues to the top of the photo to the right of the small rhyolite centre. Credit: Elizabeth Baker, Royal Holloway, University of London.