Geophysics

Mid-Atlantic Ridge Bathymetry at 13N (2012)

Mid-Atlantic Ridge Bathymetry at 13N (2012)

a) Bathymetry from the 13 N region of the Mid-Atlantic Ridge. Gray shading indicates two core complexes that have formed in the middle of a spreading segment. The box is the region interpreted in (b). Black lines: borders of the MAR ridge axis, the tops of rotated faults, and schematic striations on core complexes. B: basins that have formed during the outward rotation of the tops of the faults. b) Line drawing of the bathymetry in the box in (a) showing striated core complexes and the tops of rotated faults. B: basins as in (a).

Thermal Map - Sulfide worms (2009)

Video thumbnail for Thermal Map - Sulfide worms (2009)

Video showing thermistor array deployed at Axial Volcano at the Juan de Fuca Ridge, and the time-lapse thermal map generated from it.
Species (common):
Year: 2009
Details:
Media Type: Video
Data Type: Photograph:Video
Device Type: Camera:Video
Feature: JdF:Axial
Investigator: Raymond Lee
Expedition: AT15-51
Chief Scientist: Andrew Fisher
Species:

Crustal seismic velocity structure in the Izu-Bonin arc (2007)

Crustal seismic velocity structure in the Izu-Bonin arc (2007)

(A) Along-strike seismic velocity structure of arc crust in the Izu-Bonin arc [Kodaira et al., 2007], showing finely-resolved variations in crustal thickness. (B) The composition of lavas erupted at Izu-Bonin frontal arc volcanoes correlates with (C) the thickness of the low-velocity (Vp=6.0-6.5) middle crust beneath each volcanic center.
Species (common):
Year: 2007
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type: NotApplicable
Feature: IBM

Computational and data resources for studying solid earth dynamics (2010)

Computational and data resources for studying solid earth dynamics (2010)

A Vision being pursued by CIG during its next five years of funding. Examples of computations and data available to help us understand solid earth dynamics at a range of scales. In this case, the dynamics of plate boundary processes and their interaction with global mantle flow. RIGHT PANEL: Example output of computational codes for global mantle convection (CitcomS), midocean ridge flow with melting and melt transport, crustal scale magma injection and faulting (Gale), and small scale reactive melt channel formation. Each model was designed to consider a particular scale or set of processes.

Mantle flow model across Tonga and New Hebrides slabs (2010)

Mantle flow model across Tonga and New Hebrides slabs (2010)

The latest advances in computational science now allow resolutions at sub 1-km scales as shown in this zoom-in of the New Hebrides and Tonga slabs in a global model of mantle flow. Such models incorporate laboratory-based rheology models, assimilate data at a variety of scales and can made predictions in deformation and state of stress at fines scales while also predicting global plate motions. From Stadler et al. [2010].
Species (common):
Year: 2010
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type: NotApplicable

Subduction zone thermal model (2006)

Subduction zone thermal model (2006)

Thermal modeling from Abers et al. [2006], showing the effects of coupling between the slab and mantle wedge on temperatures.
Species (common):
Year: 2006
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type: NotApplicable
Feature: NotApplicable
Investigator: Geoffrey Abers
Expedition:
Chief Scientist:
Species:

Guaymas Basin seismic interpretation (2010)

Guaymas Basin seismic interpretation (2010)

Multi-channel seismic profile showing shallow sills intruded into biogenic sediments in the northern Guaymas Basin, Gulf of California. Figure courtesy of Dan Lizarralde.
Species (common):
Year: 2010
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type: NotApplicable
Feature: GulfOfCalifornia:GuaymasBasin
Investigator: Dan Lizarralde
Expedition: EW0210
Chief Scientist: Dan Lizarralde
Species:

Central America subduction zone characteristics (2009)

Central America subduction zone characteristics (2009)

Coupled model of deformation, fluid flow, and melting representing the Central Costa Rica. Such coupled models predict the development of a hydrated low viscosity zone on top of the slab and self consistent mantle flow field and melt fraction [after Hebert et al., 2009].
Species (common):
Year: 2009
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type: NotApplicable
Feature: CentralAmerica
Investigator: Michael Gurnis
Expedition:

Costa Rica-Nicaragua shear wave attenuation results (2008)

Costa Rica-Nicaragua shear wave attenuation results (2008)

Shear wave attenuation result from Rychert et al., [2008] showing a cold nose consistent with hypothesized coupling of the slab and mantle wedge, and/or serpentinization.
Species (common):
Year: 2008
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration
Data Type: Interpretation:Geologic
Device Type:
Feature: CentralAmerica
Investigator: Catherine Rychert
Expedition: Central_America_TUCAN
Chief Scientist: Geoffrey Abers
Species:

Subduction zone dynamics, volatiles and melts (2009)

Subduction zone dynamics, volatiles and melts (2009)

Figure from Wada and Wang [2009] showing an example for a young slab subduction zone, and including the locations of slab dehydration relative to key mechanical and rheological transition along the subduction interface, including the seismogenic zone and its down-dip edge where ETS has been observed, potential serpentinization of the mantle wedge, and kinematic coupling between the down-going slab and mantle wedge.
Species (common):
Year: 2009
Details: From GeoPRISMS Draft Science Plan
Media Type: Illustration