scholarly journals Thermal structure of the Panama Basin by analysis of seismic attenuation

2018 ◽  
Vol 730 ◽  
pp. 81-99 ◽  
Author(s):  
Carlos A. Vargas ◽  
José E. Pulido ◽  
Richard W. Hobbs
Keyword(s):  
Thermal Structure ◽  
Seismic Attenuation

scholarly journals Shear wave velocity, seismic attenuation, and thermal structure of the continental upper mantle

2004 ◽  
Vol 157 (2) ◽  
pp. 607-628 ◽  
Author(s):  
Irina M. Artemieva ◽  
Magali Billien ◽  
Jean-Jacques Lévêque ◽  
Walter D. Mooney
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Upper Mantle ◽  
Thermal Structure ◽  
Seismic Attenuation

scholarly journals Deep decoupling in subduction zones: Observations and temperature limits

Geosphere ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 1408-1424 ◽  
Author(s):  
Geoffrey A. Abers ◽  
Peter E. van Keken ◽  
Cian R. Wilson
Keyword(s):  
Subduction Zone ◽  
Shear Zone ◽  
Subduction Zones ◽  
Thermal Structure ◽  
Shear Zones ◽  
Seismic Attenuation ◽  
Plate Interface ◽  
Brittle Ductile Transition ◽  
Wide Range ◽  
Shear Heating

Abstract The plate interface undergoes two transitions between seismogenic depths and subarc depths. A brittle-ductile transition at 20–50 km depth is followed by a transition to full viscous coupling to the overlying mantle wedge at ∼80 km depth. We review evidence for both transitions, focusing on heat-flow and seismic-attenuation constraints on the deeper transition. The intervening ductile shear zone likely weakens considerably as temperature increases, such that its rheology exerts a stronger control on subduction-zone thermal structure than does frictional shear heating. We evaluate its role through analytic approximations and two-dimensional finite-element models for both idealized subduction geometries and those resembling real subduction zones. We show that a temperature-buffering process exists in the shear zone that results in temperatures being tightly controlled by the rheological strength of that shear zone’s material for a wide range of shear-heating behaviors of the shallower brittle region. Higher temperatures result in weaker shear zones and hence less heat generation, so temperatures stop increasing and shear zones stop weakening. The net result for many rheologies are temperatures limited to ≤350–420 °C along the plate interface below the cold forearc of most subduction zones until the hot coupled mantle is approached. Very young incoming plates are the exception. This rheological buffering desensitizes subduction-zone thermal structure to many parameters and may help explain the global constancy of the 80 km coupling limit. We recalculate water fluxes to the forearc wedge and deep mantle and find that shear heating has little effect on global water circulation.

Thermal structure of the southern Apennines along the Val d'Agri-Bari transect

2014 ◽  
Vol 32 ◽  
pp. 3-6
Author(s):  
Stefania Candela ◽  
Stefano Mazzoli ◽  
Antonella Megna ◽  
Stefano Santini
Keyword(s):  
Thermal Structure ◽  
Southern Apennines

DETERMINATION OF SEISMIC ATTENUATION BENEATH EAST SEA

2019 ◽  
Author(s):  
Nguyen Le Minh ◽  
Satoru Tanaka ◽  
Yasushi Ishihara ◽  
Nguyen Tien Hung ◽  
Ha Vinh Long ◽  
...  
Keyword(s):  
Seismic Attenuation ◽  
East Sea
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