- Geothermal Energy with Surface Manifestations:
- Volcanic explosive or magmatic effusive
- Steam vents
- Hot springs
- Fumaroles
- Geothermal Energy with No Surface Manifestations:
- “Blind Geothermal” with high geothermal gradients
- Rift Valley (Surface evident or Failed buried)
- Crustal Thinning with high heat flux
- Magmatic or Intrusive rock formations with adjacent faults/fractures (heat pathways)