Hogwarts (includes Harry and Hermione)
Not Dead Yet
Notes on Vent Field Description:
southern Cobb segment; two active chimney fields Not Dead Yet and Hogwarts (approx. 1km to SW of Not Dead Yet, includes Harry and Hermione vents); Baker and Hammond (1992): "Camera tows and submersible observations have recorded circumstantial evidence of venting near the intrasegment high [Malahoff et al., 1984], and Crane et al.  also found increased near-bottom temperatures in the same region. Plume distributions in 1988 and 1989 indicated that venting on the intrasegment high was concentrated at two specific sites on the south flank between 46.60N and 46.83N."
Year and How Discovered (if active, visual confirmation is listed first):
2007 ROV Jason II; 1991 camera tow did not confirm activity
Discovery References (text):
Cruise AT15-21, Chief Sci Chadwick, dive J2-295 (http://www.pmel.noaa.gov/vents/nemo/NeMO2007-cruise-report.pdf)
(plume only) Baker and Hammond (1992) Hydrothermal Venting and the Apparent Magmatic Budget of the Juan de Fuca Ridge. J. Geophys. Res. 97(B3): 3443-3456.