Heat sources in subduction zones: implications for slab seismicity and arc volcanism

McKenna, Jon; Blackwell, David

doi:10.4095/222537

Cited by 1 publication

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“…The locations are within the uncertainties of the limits of the reference model locked and transition zones from geodetic data. It has been argued that the effect of frictional heating on the thrust in the depth range of the seismogenic zone is small and usually may be neglected [ Wang et al ., ; Wang et al ., ; Wang and He , ] but the magnitude of heating remains a source of uncertainty [see McKenna and Blackwell , ]. Currie et al .…”

Section: Downdip Temperatures: the Seismic‐aseismic Transitionmentioning

confidence: 99%

“…It has been argued that the effect of frictional heating on the thrust in the depth range of the seismogenic zone is small and usually may be neglected Wang et al, 1995;Wang and He, 1999] but the magnitude of heating remains a source of uncertainty [see McKenna and Blackwell, 2002]. Currie et al [2004] included convection in the back arc in the models but this made no significant difference to temperatures in the region of the seismogenic zone.…”

Section: Downdip Temperatures: the Seismic-aseismic Transitionmentioning

confidence: 99%

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Downdip landward limit of Cascadia great earthquake rupture

Hyndman

2013

JGR Solid Earth

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[1] This paper examines the constraints to the downdip landward limit of rupture for the Cascadia great earthquakes off western North America. This limit is a primary control for ground motion hazard at near-coastal cities. The studies also provide information on the physical controls of subduction thrust rupture globally. The constraints are (1) "locked/ transition" zones from geodetic deformation (GPS, repeated leveling, tide gauges); (2) rupture zone from paleoseismic coastal marsh subsidence, "paleogeodesy"; (3) temperature on the thrust for the seismic-aseismic transition; (4) change in thrust seismic reflection character downdip from thin seismic to thick ductile; (5) fore-arc mantle corner aseismic serpentinite and talc overlying the thrust; (6) updip limit of episodic tremor and slip (ETS) slow slip; (7) rupture area associations with shelf-slope basins; (8) depth limit for small events on the thrust; and (9) landward limit of earthquakes on the Nootka transform fault zone. The most reliable constraints for the limit of large rupture displacement, >10 m, are generally just offshore in agreement with thermal control for this hot subduction zone, but well-offshore central Oregon and near the coast of northern Washington. The limit for 1-2 m rupture that can still provide strong shaking is less well estimated 25-50 km farther landward. The fore-arc mantle corner and the updip extent of ETS slow slip are significantly landward from the other constraints. Surprisingly, there is a downdip gap between the best other estimates for the great earthquake rupture zone and the ETS slow slip. In this gap, plate convergence may occur as continuous slow creep.

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Section: Downdip Temperatures: the Seismic‐aseismic Transitionmentioning

confidence: 99%