| Abstract: | Hydrothermal heat discharge in the Cascade Range includes the heat discharged by thermal springs, by "slightly thermal" springs that are only a few degrees warmer than ambient temperature, and by fumaroles. Thermal-spring heat discharge is calculated on the basis of chloride-flux measurements and geothermometer temperatures and totals ~ 240 MW in the U.S. part of the Cascade Range, excluding the transient post-1980 discharge at Mount St. Helens (~80 MW as of 2004-5). Heat discharge from "slightly thermal" springs is based on the degree of geothermal warming (after correction for gravitational potential energy effects) and totals ~. 660. MW. Fumarolic heat discharge is calculated by a variety of indirect and direct methods and totals ~160 MW, excluding the transient mid-1970s discharge at Mount Baker (~80 MW) and transient post-1980 discharge at Mount St. Helens (>. 230. MW as of 2005). Other than the pronounced transients at Mount St. Helens and Mount Baker, hydrothermal heat discharge in the Cascade Range appears to be fairly steady over a ~25-year period of measurement. Of the total of ~. 1050. MW of "steady" hydrothermal heat discharge identified in the U.S. part of the Cascade Range, less than 50. MW occurs north of latitude 45??15‘ N (~0.1 MW per km arc length from 45??15‘ to 49??N). Much greater rates of hydrothermal heat discharge south of 45??15‘N (~1.7 MW per km arc length from 40?? to 45??15‘N) may reflect the influence of Basin and Range-style extensional tectonics (faulting) that impinges on the Cascades as far north as Mount Jefferson but is not evident farther north. ?? 2010. |
| Genre: | Article |
| ProdID: | 70037638 |
| Citation Author: | Ingebritsen, S. E.; Mariner, R. H. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 218 |
| Citation Issue: | 3-4 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 11 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Hydrothermal heat discharge in the Cascade Range, northwestern United States; 2010; Article; Journal; Journal of Volcanology and Geothermal Research; Ingebritsen, S. E.; Mariner, R. H. |
| Citation Start Page: | 208 |
| Citation Volume: | 196 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | Hydrothermal heat discharge in the Cascade Range, northwestern United States; 2010; Article; Journal; Journal of Volcanology and Geothermal Research; Ingebritsen, S. E.; Mariner, R. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.jvolgeores.2010.07.023 |
| Date Other: | Fri, 1 Jan 2010 00:00 -0600 |
| Publisher: | |
