Fig. 1
From: In-situ monitoring of 3He/4He in summit gases of Kilauea Volcano (Hawaii) prior to the 2020 eruption
(a) Location of Kilauea Volcano on Island of Hawaii; (b) location of Kilauea summit caldera; (c) summit caldera with major features labeled, HVO = former site of Hawaiian Volcanoes Observatory; (d) Sulfur Banks solfatara field, showing locations of the Old Well (a.k.a. Jaggar Vault), New Well and Helium Isotope Monitor (HIM) Station sites. Green areas on maps are vegetated; white areas denote bare ground