| Abstract: | Given a uniform lithology and strain rate and a full seismic data set, the maximum depth of earthquakes may be viewed to a first order as an isotherm. These conditions are approached at the Hengill geothermal area, S. Iceland, a dominantly basaltic area. The temperature at which seismic failure ceases for the strain rates likely at the Hengill geothermal area is determined by analogy with oceanic crust, and is about 650 ?? 50??C. The topographies of the top and bottom of the seismogenic layer were mapped using 617 earthquakes. The thickness of the seismogenic layer is roughly constant and about 3 km. A shallow, aseismic, low-velocity volume within the spreading plate boundary that crosses the area occurs above the top of the seismogenic layer and is interpreted as an isolated body of partial melt. The base of the seismogenic layer has a maximum depth of about 6.5 km beneath the spreading axis and deepens to about 7 km beneath a transform zone in the south of the area. -from Author |
| Genre: | Article |
| ProdID: | 70018949 |
| Citation Author: | Foulger, G. R. |
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| Citation End Page: | 133 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
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| Citation Number Of Pages: | 15 |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | The Hengill geothermal area, Iceland: variation of temperature gradients deduced from the maximum depth of seismogenesis; 1995; Article; Journal; Journal of Volcanology and Geothermal Research; Foulger, G. R. |
| Citation Start Page: | 119 |
| Citation Volume: | 65 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | The Hengill geothermal area, Iceland: variation of temperature gradients deduced from the maximum depth of seismogenesis; 1995; Article; Journal; Journal of Volcanology and Geothermal Research; Foulger, G. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0377-0273(94)00088-X |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
| Publisher: | Elsevier |
