High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth
A receiver function transect across the Alaska Range images the subducting Pacific plate at 50^150 km depth. Across a 200 km long array of 30 receivers, the largest observed P-to-S conversions come from the top of the subducting slab. This signal is coherent across the array and is strongly asymmetr...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.474.5747 2023-05-15T13:09:43+02:00 High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth Aaron Ferris A Geo¡rey A. Abers A Douglas H. Christensen B The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5747 http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5747 http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf receiver function serpentinite Yakutat Wadati^Benio ¡ zone text 2003 ftciteseerx 2016-01-08T07:30:01Z A receiver function transect across the Alaska Range images the subducting Pacific plate at 50^150 km depth. Across a 200 km long array of 30 receivers, the largest observed P-to-S conversions come from the top of the subducting slab. This signal is coherent across the array and is strongly asymmetric, requiring a complicated interface at the top of the slab. Waveform inversion shows that the conversion is generated by a 11^22 km thick low velocity zone at the top of the slab, as much as 20 % slower than the surrounding mantle. The velocity of this zone increases with increasing depth of the slab, approaching velocities of the mantle near 150 km depth. All intermediate depth earthquakes occur within the zone, along a plane dipping 5 ‡ steeper. The layer is too thick to represent metamorphosed oceanic crust, as proposed for other subduction zones. It may represent a thick serpentinized zone or, more likely, a thick exotic terrane subducting along with the Pacific plate. Text alaska range Yakutat Alaska Unknown Pacific |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
topic |
receiver function serpentinite Yakutat Wadati^Benio ¡ zone |
spellingShingle |
receiver function serpentinite Yakutat Wadati^Benio ¡ zone Aaron Ferris A Geo¡rey A. Abers A Douglas H. Christensen B High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
topic_facet |
receiver function serpentinite Yakutat Wadati^Benio ¡ zone |
description |
A receiver function transect across the Alaska Range images the subducting Pacific plate at 50^150 km depth. Across a 200 km long array of 30 receivers, the largest observed P-to-S conversions come from the top of the subducting slab. This signal is coherent across the array and is strongly asymmetric, requiring a complicated interface at the top of the slab. Waveform inversion shows that the conversion is generated by a 11^22 km thick low velocity zone at the top of the slab, as much as 20 % slower than the surrounding mantle. The velocity of this zone increases with increasing depth of the slab, approaching velocities of the mantle near 150 km depth. All intermediate depth earthquakes occur within the zone, along a plane dipping 5 ‡ steeper. The layer is too thick to represent metamorphosed oceanic crust, as proposed for other subduction zones. It may represent a thick serpentinized zone or, more likely, a thick exotic terrane subducting along with the Pacific plate. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Aaron Ferris A Geo¡rey A. Abers A Douglas H. Christensen B |
author_facet |
Aaron Ferris A Geo¡rey A. Abers A Douglas H. Christensen B |
author_sort |
Aaron Ferris A |
title |
High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
title_short |
High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
title_full |
High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
title_fullStr |
High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
title_full_unstemmed |
High resolution image of the subducted Paci¢c (?) plate beneath central Alaska, 50^150 km depth |
title_sort |
high resolution image of the subducted paci¢c (?) plate beneath central alaska, 50^150 km depth |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5747 http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
alaska range Yakutat Alaska |
genre_facet |
alaska range Yakutat Alaska |
op_source |
http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5747 http://www.ldeo.columbia.edu/~abers/papers/Ferris++2003EPSL.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766195317050441728 |