Geological constraints on the stress state and evolution of seismogenic and creeping faults
Undergraduates: Sofia Marino (B.S. Geology UCD, 2020), Michael Hernandez (SCEC SOURCES intern summer 2021)
Sofia and Michael are mapping surficial fractures from used high-resolution lidar and field data from the Volcanic Tablelands (CA) and the Needles District (UT). They use their measurements to automatically analyze fracture density and orientation to understand how dynamic and static stresses affect fault growth and evolution. Sofia's undergrad thesis proposal was awarded a Provost's Undergraduate Fellowship that covered her fieldwork expenses.
Near-field kinematics of the 2019 Ridgecrest surface rupture
Undergraduates: Leslie Garcia (B.S. Geology UCD, 2022), Brian Aguilar, Ruth Prado, Mercedes Quintana, Thomas Shea (SCEC SOURCES interns summer 2021).
The 2019 Ridgecrest earthquake ruptured a set of orthogonal faults in the best monitored continental earthquake sequence to date. Our team is working with 2-20 cm resolution drone imagery collected by Pierce et al. (2019) and 5 cm resolution orthophotography collected by NCALM to map portions of the surface rupture with unprecedented detail. We are quantifying subtle patterns in the fracture networks comprising the rupture, including rotations, changes in scarp-facing directions, alternation between blind and surficial fault rupture, and trade-offs between localized and distributed deformation. This project is part of the SCEC SOURCES internship.