Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake
International audience On 23 June 2014, a large (Mw 7.9) earthquake ruptured within the subducting Pacific plate~ 100km below the Rat Islands archipelago, Alaska. The focal mechanism indicates two possible rupture orientations:(1) on a shallowly dipping fault plane (strike 206, dip 24, rake‐14) stri...
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ftccsdartic:oai:HAL:hal-02497896v1 2023-05-15T14:17:58+02:00 Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake Ye, Lingling Lay, Thorne Kanamori, Hiroo Freymueller, Jeffre Rivera, Luis Institut de physique du globe de Strasbourg (IPGS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) 2016-08-08 https://hal.archives-ouvertes.fr/hal-02497896 en eng HAL CCSD hal-02497896 https://hal.archives-ouvertes.fr/hal-02497896 Plate Boundaries and Natural Hazards https://hal.archives-ouvertes.fr/hal-02497896 Plate Boundaries and Natural Hazards, 2016 [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/bookPart Book sections 2016 ftccsdartic 2021-11-07T01:17:54Z International audience On 23 June 2014, a large (Mw 7.9) earthquake ruptured within the subducting Pacific plate~ 100km below the Rat Islands archipelago, Alaska. The focal mechanism indicates two possible rupture orientations:(1) on a shallowly dipping fault plane (strike 206, dip 24, rake‐14) striking perpendicular to the trench, possibly related to curvature of the underthrust slab or (2) on a steeply dipping fault plane (strike 309, dip 84, rake‐113) striking parallel to the trench, possibly associated with a slab detachment process. Joint inversion of teleseismic body waves and regional high‐rate (1 Hz) GPS recordings indicate a slip zone spanning 50km× 30km with a maximum slip of~ 11 m on the shallowly dipping plane, or a more distributed slip pattern extending upward to~ 70km, with maximum slip of~ 14 m on the steeply dipping plane. Estimated stress drops are 16 to 25 MPa. The radiated energy is~ 1.8× 1016J, and the inferred low radiation efficiency,~ 0.1, is compatible with the assumed low rupture velocity, 1.5 km/s. The finite‐fault models and aftershocks do not indicate a preferred fault plane. This type of intermediate‐depth intraslab faulting can be very damaging for populated regions above subduction zones such as Japan, Taiwan, Chile, Peru, and Indonesia. Book Part Archipelago Alaska Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Pacific Rat Islands ENVELOPE(178.303,178.303,51.788,51.788) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Ye, Lingling Lay, Thorne Kanamori, Hiroo Freymueller, Jeffre Rivera, Luis Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience On 23 June 2014, a large (Mw 7.9) earthquake ruptured within the subducting Pacific plate~ 100km below the Rat Islands archipelago, Alaska. The focal mechanism indicates two possible rupture orientations:(1) on a shallowly dipping fault plane (strike 206, dip 24, rake‐14) striking perpendicular to the trench, possibly related to curvature of the underthrust slab or (2) on a steeply dipping fault plane (strike 309, dip 84, rake‐113) striking parallel to the trench, possibly associated with a slab detachment process. Joint inversion of teleseismic body waves and regional high‐rate (1 Hz) GPS recordings indicate a slip zone spanning 50km× 30km with a maximum slip of~ 11 m on the shallowly dipping plane, or a more distributed slip pattern extending upward to~ 70km, with maximum slip of~ 14 m on the steeply dipping plane. Estimated stress drops are 16 to 25 MPa. The radiated energy is~ 1.8× 1016J, and the inferred low radiation efficiency,~ 0.1, is compatible with the assumed low rupture velocity, 1.5 km/s. The finite‐fault models and aftershocks do not indicate a preferred fault plane. This type of intermediate‐depth intraslab faulting can be very damaging for populated regions above subduction zones such as Japan, Taiwan, Chile, Peru, and Indonesia. |
author2 |
Institut de physique du globe de Strasbourg (IPGS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
format |
Book Part |
author |
Ye, Lingling Lay, Thorne Kanamori, Hiroo Freymueller, Jeffre Rivera, Luis |
author_facet |
Ye, Lingling Lay, Thorne Kanamori, Hiroo Freymueller, Jeffre Rivera, Luis |
author_sort |
Ye, Lingling |
title |
Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
title_short |
Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
title_full |
Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
title_fullStr |
Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
title_full_unstemmed |
Joint inversion of high-rate GPS and teleseismic observations for rupture process of the 23 June 2014 (Mw 7.9) Rat Islands archipelago, Alaska, intermediate depth earthquake |
title_sort |
joint inversion of high-rate gps and teleseismic observations for rupture process of the 23 june 2014 (mw 7.9) rat islands archipelago, alaska, intermediate depth earthquake |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-02497896 |
long_lat |
ENVELOPE(178.303,178.303,51.788,51.788) |
geographic |
Pacific Rat Islands |
geographic_facet |
Pacific Rat Islands |
genre |
Archipelago Alaska |
genre_facet |
Archipelago Alaska |
op_source |
Plate Boundaries and Natural Hazards https://hal.archives-ouvertes.fr/hal-02497896 Plate Boundaries and Natural Hazards, 2016 |
op_relation |
hal-02497896 https://hal.archives-ouvertes.fr/hal-02497896 |
_version_ |
1766289767183417344 |