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Geophysical reconnaissance study of the Hengill high-temperature geothermal area, SW-Iceland

Axel Björnsson, Gylfi Páll Hersir

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Abstract

The active central volcano Hengill, within the Neo-volcanic zone in SW-Iceland, is intersected by a major NE-SW trending fissure swarm. There is an abundance of hot springs and fumaroles within a high-temperature geothermal area, which is characterized by a low-resistivity anomaly some 120 km/sup 2/ in areal extent. The central hottest part is about 50 km/sup 2/ and is indicated by a resistivity-high at depth. An aeromagnetic map shows negative anomalies, caused by hydrothermal alteration. The best geothermal prospects are presumably within the fissure swarm outside the central region.

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What this paper is about

The active central volcano Hengill, within the Neo-volcanic zone in SW-Iceland, is intersected by a major NE-SW trending fissure swarm. There is an abundance of hot springs and fumaroles within a high-temperature geothermal area, which is characterized by a low-resistivity anomaly some 120 km/sup 2/ in areal extent. The central hottest part is about 50 km/sup 2/ and is indicated by a resistivity-high at depth. An aeromagnetic map shows negative anomalies, caused by hydrothermal alteration. The best geothermal prospects are presumably within the fissure swarm outside the central region.

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Available abstract

The active central volcano Hengill, within the Neo-volcanic zone in SW-Iceland, is intersected by a major NE-SW trending fissure swarm. There is an abundance of hot springs and fumaroles within a high-temperature geothermal area, which is characterized by a low-resistivity anomaly some 120 km/sup 2/ in areal extent. The central hottest part is about 50 km/sup 2/ and is indicated by a resistivity-high at depth. An aeromagnetic map shows negative anomalies, caused by hydrothermal alteration. The best geothermal prospects are presumably within the fissure swarm outside the central region.

Key concepts: Geothermal gradient, Fumarole, Geology, Volcano, Geothermal exploration, Hydrothermal circulation, Anomaly (physics), Geophysics

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