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 - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2016

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

Lingling Ye
  • Fonction : Auteur
Thorne Lay
  • Fonction : Auteur
Hiroo Kanamori
  • Fonction : Auteur
Jeffre Freymueller
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-03032586 , version 1 (30-11-2020)

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  • HAL Id : hal-03032586 , version 1

Citer

Lingling Ye, Thorne Lay, Hiroo Kanamori, Jeffre Freymueller, Luis Rivera. 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. Plate Boundaries and Natural Hazards, Geophysical Monograph 219, AGU, 2016, 9781119054146. ⟨hal-03032586⟩
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