Seismic explosion sources on an ice cap:Technical considerations
Controlled source seismic investigation of crustal structure below ice covers is an emerging technique. We have recently conducted an explosive refraction/wide-angle reflection seismic experiment on the ice cap in east-central Greenland. The data-quality is high for all shot points and a full crusta...
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ftcopenhagenunip:oai:pure.atira.dk:publications/307e13a9-716a-4a0c-b8f1-d1e7361e64b5 2024-05-19T07:41:13+00:00 Seismic explosion sources on an ice cap:Technical considerations Shulgin, Alexey Thybo, Hans 2015 https://curis.ku.dk/portal/da/publications/seismic-explosion-sources-on-an-ice-cap(307e13a9-716a-4a0c-b8f1-d1e7361e64b5).html https://doi.org/10.1016/j.polar.2014.11.002 eng eng info:eu-repo/semantics/closedAccess Shulgin , A & Thybo , H 2015 , ' Seismic explosion sources on an ice cap : Technical considerations ' , Polar Science , vol. 9 , no. 1 , pp. 107-118 . https://doi.org/10.1016/j.polar.2014.11.002 Active sources Greenland Seismics on ice Seismology article 2015 ftcopenhagenunip https://doi.org/10.1016/j.polar.2014.11.002 2024-04-25T00:45:02Z Controlled source seismic investigation of crustal structure below ice covers is an emerging technique. We have recently conducted an explosive refraction/wide-angle reflection seismic experiment on the ice cap in east-central Greenland. The data-quality is high for all shot points and a full crustal model can be modelled. A crucial challenge for applying the technique is to control the sources. Here, we present data that describe the efficiency of explosive sources in the ice cover. Analysis of the data shows, that the ice cap traps a significant amount of energy, which is observed as a strong ice wave. The ice cap leads to low transmission of energy into the crust such that charges need be larger than in conventional onshore experiments to obtain reliable seismic signals. The strong reflection coefficient at the base of the ice generates strong multiples which may mask for secondary phases. This effect may be crucial for acquisition of reflection seismic profiles on ice caps. Our experience shows that it is essential to use optimum depth for the charges and to seal the boreholes carefully. Article in Journal/Newspaper Greenland Ice cap Polar Science Polar Science University of Copenhagen: Research Polar Science 9 1 107 118 |
institution |
Open Polar |
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University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Active sources Greenland Seismics on ice Seismology |
spellingShingle |
Active sources Greenland Seismics on ice Seismology Shulgin, Alexey Thybo, Hans Seismic explosion sources on an ice cap:Technical considerations |
topic_facet |
Active sources Greenland Seismics on ice Seismology |
description |
Controlled source seismic investigation of crustal structure below ice covers is an emerging technique. We have recently conducted an explosive refraction/wide-angle reflection seismic experiment on the ice cap in east-central Greenland. The data-quality is high for all shot points and a full crustal model can be modelled. A crucial challenge for applying the technique is to control the sources. Here, we present data that describe the efficiency of explosive sources in the ice cover. Analysis of the data shows, that the ice cap traps a significant amount of energy, which is observed as a strong ice wave. The ice cap leads to low transmission of energy into the crust such that charges need be larger than in conventional onshore experiments to obtain reliable seismic signals. The strong reflection coefficient at the base of the ice generates strong multiples which may mask for secondary phases. This effect may be crucial for acquisition of reflection seismic profiles on ice caps. Our experience shows that it is essential to use optimum depth for the charges and to seal the boreholes carefully. |
format |
Article in Journal/Newspaper |
author |
Shulgin, Alexey Thybo, Hans |
author_facet |
Shulgin, Alexey Thybo, Hans |
author_sort |
Shulgin, Alexey |
title |
Seismic explosion sources on an ice cap:Technical considerations |
title_short |
Seismic explosion sources on an ice cap:Technical considerations |
title_full |
Seismic explosion sources on an ice cap:Technical considerations |
title_fullStr |
Seismic explosion sources on an ice cap:Technical considerations |
title_full_unstemmed |
Seismic explosion sources on an ice cap:Technical considerations |
title_sort |
seismic explosion sources on an ice cap:technical considerations |
publishDate |
2015 |
url |
https://curis.ku.dk/portal/da/publications/seismic-explosion-sources-on-an-ice-cap(307e13a9-716a-4a0c-b8f1-d1e7361e64b5).html https://doi.org/10.1016/j.polar.2014.11.002 |
genre |
Greenland Ice cap Polar Science Polar Science |
genre_facet |
Greenland Ice cap Polar Science Polar Science |
op_source |
Shulgin , A & Thybo , H 2015 , ' Seismic explosion sources on an ice cap : Technical considerations ' , Polar Science , vol. 9 , no. 1 , pp. 107-118 . https://doi.org/10.1016/j.polar.2014.11.002 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.polar.2014.11.002 |
container_title |
Polar Science |
container_volume |
9 |
container_issue |
1 |
container_start_page |
107 |
op_container_end_page |
118 |
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1799480816856727552 |