Plate coupling and strain in the far western Aleutian arc modeled from GPS data
Abstract The Aleutian and Kuril‐Kamchatka arcs meet at a triple junction of the Pacific (PAC), Bering (BER), and North American (NAM) plates. We invert GPS observations from the westernmost Aleutian (Komandorsky) Islands and Kamchatka for the fault locking depth and block motion in the far western A...
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| Format: | Article |
| Language: | English |
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Wiley
2017-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL072735 |
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| author | Mikhail G. Kogan Dmitry I. Frolov Nikolay F. Vasilenko Jeffrey T. Freymueller Grigory M. Steblov Göran Ekström Nikolay N. Titkov Alexandr S. Prytkov |
| author_facet | Mikhail G. Kogan Dmitry I. Frolov Nikolay F. Vasilenko Jeffrey T. Freymueller Grigory M. Steblov Göran Ekström Nikolay N. Titkov Alexandr S. Prytkov |
| author_sort | Mikhail G. Kogan |
| collection | DOAJ |
| description | Abstract The Aleutian and Kuril‐Kamchatka arcs meet at a triple junction of the Pacific (PAC), Bering (BER), and North American (NAM) plates. We invert GPS observations from the westernmost Aleutian (Komandorsky) Islands and Kamchatka for the fault locking depth and block motion in the far western Aleutian transform boundary. Three boundary models were considered: (1) only the Aleutian thrust fault without a trench‐normal component, (2) only a strike‐slip fault in the back arc north of the Komandorsky Islands, and (3) a rigid Komandorsky sliver bounded by the Aleutian and back‐arc faults. Observed velocities prefer Model 3, with a secular westward sliver velocity of 51 mm/a relative to NAM (two thirds of the total PAC‐NAM motion). The observed velocities are ~10% slower because of elastic strain from boundary faults. The best fitting locking depth of faults bounding the sliver is 12 km, which is similar to depths observed in diverse tectonic environments. |
| format | Article |
| id | doaj-art-a122d515486f4dea99e34ddcebeda535 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a122d515486f4dea99e34ddcebeda5352025-08-20T03:49:46ZengWileyGeophysical Research Letters0094-82761944-80072017-04-014473176318310.1002/2017GL072735Plate coupling and strain in the far western Aleutian arc modeled from GPS dataMikhail G. Kogan0Dmitry I. Frolov1Nikolay F. Vasilenko2Jeffrey T. Freymueller3Grigory M. Steblov4Göran Ekström5Nikolay N. Titkov6Alexandr S. Prytkov7Lamont‐Doherty Earth Observatory Columbia University Palisades New York USAIoffe Institute RAS St. Petersburg RussiaInstitute of Marine Geology and Geophysics FEB RAS Yuzhno‐Sakhalinsk RussiaGeophysical Institute University of Alaska Fairbanks Fairbanks Alaska USASchmidt Institute of Physics of the Earth RAS Moscow RussiaLamont‐Doherty Earth Observatory Columbia University Palisades New York USAKamchatka Division of Geophysical Survey RAS Petropavlovsk‐Kamchatsky RussiaInstitute of Marine Geology and Geophysics FEB RAS Yuzhno‐Sakhalinsk RussiaAbstract The Aleutian and Kuril‐Kamchatka arcs meet at a triple junction of the Pacific (PAC), Bering (BER), and North American (NAM) plates. We invert GPS observations from the westernmost Aleutian (Komandorsky) Islands and Kamchatka for the fault locking depth and block motion in the far western Aleutian transform boundary. Three boundary models were considered: (1) only the Aleutian thrust fault without a trench‐normal component, (2) only a strike‐slip fault in the back arc north of the Komandorsky Islands, and (3) a rigid Komandorsky sliver bounded by the Aleutian and back‐arc faults. Observed velocities prefer Model 3, with a secular westward sliver velocity of 51 mm/a relative to NAM (two thirds of the total PAC‐NAM motion). The observed velocities are ~10% slower because of elastic strain from boundary faults. The best fitting locking depth of faults bounding the sliver is 12 km, which is similar to depths observed in diverse tectonic environments.https://doi.org/10.1002/2017GL072735KomandorskyAleutiansubductionobliquesliverGPS |
| spellingShingle | Mikhail G. Kogan Dmitry I. Frolov Nikolay F. Vasilenko Jeffrey T. Freymueller Grigory M. Steblov Göran Ekström Nikolay N. Titkov Alexandr S. Prytkov Plate coupling and strain in the far western Aleutian arc modeled from GPS data Geophysical Research Letters Komandorsky Aleutian subduction oblique sliver GPS |
| title | Plate coupling and strain in the far western Aleutian arc modeled from GPS data |
| title_full | Plate coupling and strain in the far western Aleutian arc modeled from GPS data |
| title_fullStr | Plate coupling and strain in the far western Aleutian arc modeled from GPS data |
| title_full_unstemmed | Plate coupling and strain in the far western Aleutian arc modeled from GPS data |
| title_short | Plate coupling and strain in the far western Aleutian arc modeled from GPS data |
| title_sort | plate coupling and strain in the far western aleutian arc modeled from gps data |
| topic | Komandorsky Aleutian subduction oblique sliver GPS |
| url | https://doi.org/10.1002/2017GL072735 |
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