Faulting in geothermal areas

Major geothermal areas occur in regions of normal faulting and accompanying volcanic activity caused by tectonic tension. Specifically they are associated with (1) Quaternary volcanic centers in structures caused by volcanic processes, (2) Quaternary volcanic centers in structures caused by tectonic processes, (3) Cenozoic tectonism producing hinterland fault block structures, (4) Cenozoic rift zones, (5) Cenozoic tectonism in hinterland basins, and (6) foreland and platform areas. Descriptions are given of the fault patterns for the Geysers, Larderello and Monte Amiata, Wairakei and Broadlands, Imperial Valley, Cerro Prieto and Pathe, Matsukawa and Otake, Pauzhetsk, Yellowstone Park, Iceland, and Long Valley. 19 figures (LBS)