An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost
© The Authors. Published by the Society of Exploration Geophysicists. To better understand the relationship between P-wave velocities and ice content in saturated, unconsolidated saline permafrost, we constructed an effective-medium model based upon ultrasonic P-wave data that were obtained from ear...
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ftcdlib:qt1cg559k6 2023-05-15T16:36:54+02:00 An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost Dou, S Nakagawa, S Dreger, D Ajo-Franklin, J EN33 - EN50 2017-05-01 application/pdf http://www.escholarship.org/uc/item/1cg559k6 english eng eScholarship, University of California qt1cg559k6 http://www.escholarship.org/uc/item/1cg559k6 public Dou, S; Nakagawa, S; Dreger, D; & Ajo-Franklin, J. (2017). An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost. Geophysics, 82(3), EN33 - EN50. doi:10.1190/GEO2016-0474.1. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/1cg559k6 article 2017 ftcdlib https://doi.org/10.1190/GEO2016-0474.1 2018-09-28T22:52:42Z © The Authors. Published by the Society of Exploration Geophysicists. To better understand the relationship between P-wave velocities and ice content in saturated, unconsolidated saline permafrost, we constructed an effective-medium model based upon ultrasonic P-wave data that were obtained from earlier laboratory studies. The model uses a two-end-member mixing approach in which an ice-filled, fully frozen end member and a water-filled, fully unfrozen end member are mixed together to form the effective medium of partially frozen sediments. This mixing approach has two key advantages: (1) It does not require parameter tuning of the mixing ratios, and (2) it inherently assumes mixed pore-scale distributions of ice that consist of frame-strengthening (i.e., cementing and/or loadbearing) ice and pore-filling ice. The model-predicted P-wave velocities agree well with our laboratory data, demonstrating the effectiveness of the model for quantitatively inferring ice content from P-wave velocities. The modeling workflow is simple and is largely free of calibration parameters -attributes that ease its application in interpreting field data sets. Article in Journal/Newspaper Ice permafrost University of California: eScholarship GEOPHYSICS 82 3 EN33 EN50 |
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Open Polar |
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University of California: eScholarship |
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English |
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© The Authors. Published by the Society of Exploration Geophysicists. To better understand the relationship between P-wave velocities and ice content in saturated, unconsolidated saline permafrost, we constructed an effective-medium model based upon ultrasonic P-wave data that were obtained from earlier laboratory studies. The model uses a two-end-member mixing approach in which an ice-filled, fully frozen end member and a water-filled, fully unfrozen end member are mixed together to form the effective medium of partially frozen sediments. This mixing approach has two key advantages: (1) It does not require parameter tuning of the mixing ratios, and (2) it inherently assumes mixed pore-scale distributions of ice that consist of frame-strengthening (i.e., cementing and/or loadbearing) ice and pore-filling ice. The model-predicted P-wave velocities agree well with our laboratory data, demonstrating the effectiveness of the model for quantitatively inferring ice content from P-wave velocities. The modeling workflow is simple and is largely free of calibration parameters -attributes that ease its application in interpreting field data sets. |
format |
Article in Journal/Newspaper |
author |
Dou, S Nakagawa, S Dreger, D Ajo-Franklin, J |
spellingShingle |
Dou, S Nakagawa, S Dreger, D Ajo-Franklin, J An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
author_facet |
Dou, S Nakagawa, S Dreger, D Ajo-Franklin, J |
author_sort |
Dou, S |
title |
An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
title_short |
An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
title_full |
An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
title_fullStr |
An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
title_full_unstemmed |
An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost |
title_sort |
effective-medium model for p-wave velocities of saturated, unconsolidated saline permafrost |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
http://www.escholarship.org/uc/item/1cg559k6 |
op_coverage |
EN33 - EN50 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Dou, S; Nakagawa, S; Dreger, D; & Ajo-Franklin, J. (2017). An effective-medium model for P-wave velocities of saturated, unconsolidated saline permafrost. Geophysics, 82(3), EN33 - EN50. doi:10.1190/GEO2016-0474.1. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/1cg559k6 |
op_relation |
qt1cg559k6 http://www.escholarship.org/uc/item/1cg559k6 |
op_rights |
public |
op_doi |
https://doi.org/10.1190/GEO2016-0474.1 |
container_title |
GEOPHYSICS |
container_volume |
82 |
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3 |
container_start_page |
EN33 |
op_container_end_page |
EN50 |
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1766027214707490816 |