Satellite geological and geophysical remote sensing of Iceland
The author has identified the following significant results. ERTS-1 imagery provides sufficient resolution to discern two effects of geothermal activity at the Namafjall geothermal area: snowmelt anomalies and delineation of altered ground. The fallout pattern of tephra from Hekla's 1970 volcan...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19740013879 2023-05-15T16:21:47+02:00 Satellite geological and geophysical remote sensing of Iceland Williams, R. S., Jr. Unclassified, Unlimited, Publicly available Mar 1, 1974 application/pdf http://hdl.handle.net/2060/19740013879 unknown Document ID: 19740013879 Accession ID: 74N21992 http://hdl.handle.net/2060/19740013879 No Copyright CASI GEOPHYSICS E74-10467 NASA-CR-136868 1974 ftnasantrs 2019-07-21T05:31:19Z The author has identified the following significant results. ERTS-1 imagery provides sufficient resolution to discern two effects of geothermal activity at the Namafjall geothermal area: snowmelt anomalies and delineation of altered ground. The fallout pattern of tephra from Hekla's 1970 volcanic eruption can be mapped where sufficient depth of deposition destroyed the vegetation. Lava flows from the volcanic eruptions at Askja and Hekla can be delineated. Low sun-angle imagery of snow-covered terrain has permitted the mapping of new structural and volcanic features beneath the icecaps. Coastline changes on the islands of Surtsey and Heimaey can be mapped. Variations of sediment plumes from glacial rivers on the south coast give a qualitative indication of seasonal changes in melting rates of glaciers. ERTS-1 imagery has been shown to be especially amenable to portrayal of changing glaciological phenomena: surging glaciers, collapse features in icecaps caused by subglacial volcanic (?) and geothermal activity and resulting jokulhlaups, and variations in size of glacier-margin lakes. A fifth vegetation class has now been added: lichen-covered bedrock. The high latitude permits more precise analysis of landforms, vegetation distribution, occurrence of snow cover, glaciers, and geologic structure. Other/Unknown Material glacier Heimaey Hekla Iceland Surtsey NASA Technical Reports Server (NTRS) Askja ENVELOPE(-16.802,-16.802,65.042,65.042) Heimaey ENVELOPE(-22.486,-22.486,65.099,65.099) Surtsey ENVELOPE(-20.608,-20.608,63.301,63.301) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
GEOPHYSICS |
spellingShingle |
GEOPHYSICS Williams, R. S., Jr. Satellite geological and geophysical remote sensing of Iceland |
topic_facet |
GEOPHYSICS |
description |
The author has identified the following significant results. ERTS-1 imagery provides sufficient resolution to discern two effects of geothermal activity at the Namafjall geothermal area: snowmelt anomalies and delineation of altered ground. The fallout pattern of tephra from Hekla's 1970 volcanic eruption can be mapped where sufficient depth of deposition destroyed the vegetation. Lava flows from the volcanic eruptions at Askja and Hekla can be delineated. Low sun-angle imagery of snow-covered terrain has permitted the mapping of new structural and volcanic features beneath the icecaps. Coastline changes on the islands of Surtsey and Heimaey can be mapped. Variations of sediment plumes from glacial rivers on the south coast give a qualitative indication of seasonal changes in melting rates of glaciers. ERTS-1 imagery has been shown to be especially amenable to portrayal of changing glaciological phenomena: surging glaciers, collapse features in icecaps caused by subglacial volcanic (?) and geothermal activity and resulting jokulhlaups, and variations in size of glacier-margin lakes. A fifth vegetation class has now been added: lichen-covered bedrock. The high latitude permits more precise analysis of landforms, vegetation distribution, occurrence of snow cover, glaciers, and geologic structure. |
format |
Other/Unknown Material |
author |
Williams, R. S., Jr. |
author_facet |
Williams, R. S., Jr. |
author_sort |
Williams, R. S., Jr. |
title |
Satellite geological and geophysical remote sensing of Iceland |
title_short |
Satellite geological and geophysical remote sensing of Iceland |
title_full |
Satellite geological and geophysical remote sensing of Iceland |
title_fullStr |
Satellite geological and geophysical remote sensing of Iceland |
title_full_unstemmed |
Satellite geological and geophysical remote sensing of Iceland |
title_sort |
satellite geological and geophysical remote sensing of iceland |
publishDate |
1974 |
url |
http://hdl.handle.net/2060/19740013879 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-16.802,-16.802,65.042,65.042) ENVELOPE(-22.486,-22.486,65.099,65.099) ENVELOPE(-20.608,-20.608,63.301,63.301) |
geographic |
Askja Heimaey Surtsey |
geographic_facet |
Askja Heimaey Surtsey |
genre |
glacier Heimaey Hekla Iceland Surtsey |
genre_facet |
glacier Heimaey Hekla Iceland Surtsey |
op_source |
CASI |
op_relation |
Document ID: 19740013879 Accession ID: 74N21992 http://hdl.handle.net/2060/19740013879 |
op_rights |
No Copyright |
_version_ |
1766009763302211584 |