ACTIVE_CRUST
ACTIVE_CRUST: "ACTIVE_CRUST"
ALASKA
ALASKA: "ALASKA"
ALL
ALL: "ALL"
PUERTO_RICO
PUERTO_RICO: "PUERTO_RICO"
STABLE_CRUST
STABLE_CRUST: "STABLE_CRUST"
SUBDUCTION_INTERFACE
SUBDUCTION_INTERFACE: "SUBDUCTION_INTERFACE"
SUBDUCTION_SLAB
SUBDUCTION_SLAB: "SUBDUCTION_SLAB"
VOLCANIC
VOLCANIC: "VOLCANIC"