Earthscope in the Northern U.S. Rockies: Tectonic Targets and Passive-Source Seismology Weapons * R. M. Russo Dept. of Geological Sciences University of.

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Presentation transcript:

Earthscope in the Northern U.S. Rockies: Tectonic Targets and Passive-Source Seismology Weapons * R. M. Russo Dept. of Geological Sciences University of Florida Gainesville, FL R. M. Russo Dept. of Geological Sciences University of Florida Gainesville, FL * (Or how I learned to stop worrying and love earthquakes)

Geologic Targets What is the craton shape, from surface down? What is relief – if any – on craton bottom? Do the wide Mz and Cz magmatic belts at the surface still have expressions at depth? Can distribution, styles of surface deformation be related to upper mantle structures? - cratonization, belt rifting, accretion, Sevier & Laramide shortening, Eocene & Basin-Range extension Transition to Canadian Rockies Yellowstone plumbing system

Seismologic Weapons: Body wave, surface wave tomography - teleseismic P, S waves; Rayleigh, Love waves - seismic velocities resolved, ~ km depth Receiver functions - teleseismic P, local Ps phases & reverbs - S velocities resolved, ~60 km depth to surface - sharp seismic discontinuities revealed - fine anisotropic structure detailed

Seismologic Weapons: Shear wave splitting - teleseismic S phases (SKS, SKKS, PKS, S) - seismic anisotropy resolved, ~0-410 km depth Seismic attenuation - any P and S wave pairs - attenuation along source-station path resolved - sensitive to temperature, not composition - 3-d attenuation structure

Tomography

Depth Resolution

Receiver Functions From Stein & Wysession (2001)

Seismic Anisotropy and Shear-Wave Splitting

Splitting of an S phase: Particle Motion Correction

Splitting of an S phase: Contoured Energy

Upper Mantle Flow around the Ontong-Java Plateau Root

Seismic Attenuation

P and S Wave Windowing for Spectra

Qs Calculation from Spectral Ratio Slope

Qs at East European Platform stations

Qs at Transylvania Basin stations

Delamination Possible?

Chile Ridge Subduction Subduction of the Chile Ridge occurs beneath southern SA. Ridge subduction has a profound effect on the overriding continent. It may also channel upper mantle flow, allowing a strong test of the ideas outlined in this talk.

Chile Ridge Triple Junction & Slab Window

Current UF-UChile Chile Ridge Triple Junction Passive Seismic Deployment