**Appendix A**

**Figure A1.** Shaman conduit view in 2010 (photo by G. Karpov, south view).

**Figure A2.** Shaman geyser eruption in 2010 (photo by G. Karpov, south view).

**Figure A3.** Shaman geyser area view, SH—Shaman geyser, SH2—adjacent CO2 hot spring, SH3—hot spring in the upstream of creek, partially diverted into Shaman geyser conduit (photo by G. Karpov, 2015, northwest view).

**Figure A4.** Shaman geyser pool pre-eruption infrared (IR) (testo-865) view. Photo by A. Kiryukhin, 24 August 2019.

**Figure A5.** Shaman geyser conduit top view, grid scale 20 cm. Photo by A. Kiryukhin, 24 August 2019.

**Figure A6.** Shaman geyser pool view, in front is partially diverted to the Shaman conduit creek, coming from SH3 (see Figure 2). Photo by A. Kiryukhin, 25 August 2019.

**Figure A7.** Shaman geyser eruption events on 24 August 2019 20:01. Times (negative): −07:42—discharge; −05:36—discharge increase; −05:15—eruption #1; −05:03—some backflow; −04:35—discharge increase; −04:28—eruption #2; −04:19—some backflow; −03:31—discharge increase; −03:27—eruption #3; −03:15—some backflow; −02:16—discharge increase, but no eruption commenced; −00:30—backflow recharge start; −00:15, −00:08; 00:00—cold water inflow in geyser conduit starts and continues, water level in conduit is 1 m in depth. Time stamp format minutes:seconds. Photo by A. Kiryukhin, 24 August 2019.

**Figure A8.** Shaman geyser eruptions on 06.09.2014, 21.04.2019, and 12.09.2019 and the conduit top view in 2019. Time stamp format in a left-bottom minutes:seconds. (photo by A. Kiryukhin (06.09.2014, 21.04.2019) and N. Ostrik (12.09.2019)).

*Geosciences* **2020**, *10*, 180

**Figure A9.** Bannoye Lake/Maar. Photo by A. Kiryukhin, 24 August 2019.

**Figure A10.** Dalneye Lake/Maar. Photo by A. Kiryukhin, 24 August 2019.

**Figure A11.** Shaman-2 CO2-hot spring located adjacent to the Shaman geyser (next candidate to be a geyser in the Uzon caldera). Photo by A. Kiryukhin, 25 August 2019.
