ACTIVE TECTONICS PROJECTS
Long term slip rate of the Banning strand of the southern San Andreas fault
Funding: Southern California Earthquake Center (SCEC), National Earthquake Hazards Reduction Program (NEHRP)
Collaborators: Peter Gold*, Aaron Salin*, Dylan Rood, Warren Sharp, Tom Rockwell, Katherine Kendrick
Kinematics and rates of slip along the Agua Blanca and San Miguel-Vallecitos fault zones in Baja California, Mexico
The Agua Blanca and San Miguel-Vallectios faults in Baja California together accommodate ~14% of plate boundary motion at this latitude. We are investigating their rates of slip and kinematic linkages with other faults within the San Andreas system and faults within the Gulf of California Rift Zone.
Funding: Southern California Earthquake Center (SCEC)
Collaborators: Peter Gold*, Alejandro Hinojosa Corona, Tom Rockwell, John Fletcher
STRUCTURAL GEOLOGY/RHEOLOGY PROJECTS
Present-day rheology of the lithospheric mantle beneath the Mojave region from naturally deformed peridotite xenoliths.
Funding: NSF Tectonics Program
Collaborators: Rachel Bernard*, Greg Hirth, Rick Hervig, Andy Freed
Publications: Behr & Hirth, 2014
Deformation in the mantle wedge associated with Laramide flat-slab subduction.
Inclusions in serpentinized ultramafic diatremes erupted within the Colorado Plateau represent pieces of the variably hydrated mantle wedge, as well as tectonically eroded and entrained fragments of the plate interface, each associated with Laramide flat-slab subduction. They provide a unique opportunity to investigate the effects of water on olivine lattice preferred orientations, with implications for seismic anisotropy in the mantle wedge.
Collaborators: Doug Smith
Mechanisms and longevity of strain localization during dynamic recrystallization of olivine.
Experiments being undertaken on dry olivine aggregates help determine why Earth’s rigid outer shell, the lithosphere, is commonly localized into faults and shear zones, rather than distributed over wide distances.
Funding: NSF Tectonics Program
Collaborators: *Pamela Speciale, Greg Hirth, David Kohlstedt
Subduction zone processes as preserved in high pressure rocks of Syros Island, Greece.
High pressure subduction complexes preserve on Syros Island in Greece record different mechanical behaviors as they transition from subduction to exhumation.
Collaborators: Alissa Kotowski*, Danny Stockli, Jaime Barnes, Miguel Cisneros*, Spender Seman*, Natalie Reia*
Ti-in-quartz thermobarometry applied to metamorphic rocks of the Santa Rosa mylonite zone in CA.
Intercalated granitic and metapelitic high strain mylonites provide insight into how trace Ti in quartz becomes redistributed with different amounts of deformation and in different rock types.
Funding: Undergraduate Honors Research Program
Collaborators: Taylor Canada*, Danny Stockli
Timing of subduction and high pressure metamorphism in the western Mediterranean.
Funding: Jackson School of Geosciences Seed Grant
Collaborators: Kory Kirchner*, Staci Loewy, Jason Williams, John Platt, Danny Stockli
* = UT student working on project