The February 2023 workshop was held in-person, with the following objectives: 1) Present the latest version of the CRM to the broader community; 2) Discuss the relation between the CRM and other CXM components; 3) Initiate projects aimed at validating, refining, and extending the CRM; and 4) Inspire use of the CRM by the broader community. Session 1 included presentations describing the CRM as it stands and explain how it was built, to stimulate discussion about publications, dissemination, and access to this project. Sessions 2 and 3 were focused on looking ahead. They included round-table discussion and short "idea talks" from each participant. These talks ranged from what is currently missing in the CRM, on information or data they'd like to contribute to the effort, or on ideas for applications that may involve the CRM. By seeding ideas and discusions, we hoped to initiate exiting new projects and collaborations that make the CRM a more useful tool for the broader community.

The workshop was followed by a one-day field trip to local exposures of brittle and ductile shear zones in exhumed deep crustal rocks in Cucamonga Canyon. The southeast corner of the San Gabriel lithotectonic block exposes a thick section of sheared Cretaceous arc rocks that represent some of the deepest exposures of crust in the region (see figure). The close association of the Quaternary faults that bound the San Gabriel lithotectonic block (Cucamonga Fault, San Jacinto) and the Cretaceous ductile shear zone fabrics in the block demonstrates the potential for older rock fabrics to act as stress guides for younger, brittle structures associated with the San Andreas Fault system (Schulte-Pelkum et al., 2020). Including structure of this kind is a major ongoing effort of the CRM Working Group. The field trip will focus on the lower crustal Cucamonga mylonites and middle crustal Black Belt mylonites that comprise the shear zone exposed in the SE San Gabriel Block (Alf, 1948; May & Walker, 1989). The field trip will feature a traverse through the mylonites exposed in Cucamonga Canyon and the location where the mylonites are cut by the Quaternary Cucamonga Fault and its subsidiary brittle deformation (McPhillips & Scharer, 2018; Morton & Matti, 1987). 

Presentation slides may be downloaded by clicking the links following the title. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk. Only the presentations for which SCEC has received permission to post publicly are included below.

MONDAY, FEBRUARY 27, 2023

TUESDAY, FEBRUARY 28, 2023

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PARTICIPANTS