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Geothermal Energy 1249 USGS

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Geothermal Energy 1249 USGS ( geothermal-energy-1249-usgs )

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gins of this physiographic province—along its western margin in California, Nevada, and Arizona and along its eastern margin in Idaho and Utah. Other hydrothermal systems, not obviously expressed at the surface, could be present within the interior parts of the province. To date, only a few such systems have been developed. Discovery of additional geothermal sys- tems within the Basin and Range Province would be enhanced by new geophysical studies and drilling at selected locations. Such work might be efficiently accomplished under the type of government-industry-coupled program that successfully produced a series of state geothermal-resource assessments during the 1970s and 1980s. Another region that merits continued study is the Cas- cade Range in Washington, Oregon, and northern California. Hydrothermal systems have been identified and partially explored at Medicine Lake Highlands in California, Newberry Crater in Oregon, and at Mount Meager in British Columbia, Canada. Ongoing research by the U.S. Geological Survey (USGS) is focused on understanding the evolution of the Cas- cade volcanoes. Drilling of selected geothermal target areas would complement such studies. ���� Geothermal Energy—Clean Power From the Earth’s Heat 31 Searching for Deeper Hydrothermal Systems Because all hydrothermal systems with surface expression have been found and explored to some degree, an important line of research is to develop techniques and strategies to dis- cover hidden systems at greater depths. This research requires deep drilling. Given the relatively high risk of such ventures, this work seems appropriate principally for the public sector, perhaps on a cost-sharing basis with the private sector. Additional research into the origins of vapor-dominated systems is also needed, and target areas should include The Geysers, California, and Larderello, Italy—two areas where this uncommon but highly sought after geothermal environ- ment exists. Current understanding of how these exceptionally high-grade steam systems originate and persist over geologic time is poor, despite the fact that these are the electrical-grade resource most easily developed. In addition, recent drilling at The Geysers and Larderello has revealed high-pressure, hot-water regimes adjacent to the developed steam zones. This exciting discovery invites an entirely new thrust for the study of deeper, higher pressure underpinnings (so-called root zones) ���� ����������� ���� ����� �� ���������� ��� ������ ����� ���� ���� �� ���� �� �� �� ���� �� �� ��� ������� ���� ��� ���������� �������� ������ ������ � � ��� ����� ��� ���������� ��� ��� ��� Map of physiographic prov- inces, other geographic features of geothermal interest, and heat flow in the south- western United States. G, The Geysers; LV, Long Valley. ������� ������� ����� ��������� ������� ����� ������ ���������� ������ ����� ������ �������� ���� ���� � ������ ������ � � � � ������� ����� � � � � �� ���� � � � � �������� ��� ������ �������� ������� � � � � � � � � � � � � � � ������� �����

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