Lithospheric Architecture & Dynamics Workshop

March 6 - 7, 2008, 10 am - 3 pm

UCLA
Los Angeles, CA

The workshop will gather researchers to review our understanding of the geologic provenance, current structure, and physical state of the southern California Lithosphere and how these relate to absolute stress, it’s evolution and the generation of earthquakes.

Day 1: Thursday, March 6, 2008

PART 1: GEOLOGICAL INHERITANCE:
10:00 Introduction to Day 1
10:10 Overview motivation and goals (Humphreys)
10:20 Geologic structure: Underplated schist (Platt)
10:40 Effects of Laramide slab flattening and removal (Luffi)
11:00 Farallon plate reconstruction (Chapman/Kidder)
11:20 Construction and tectonic rearrangement of S California below (Nicholson)
11:40 Tectonic evolution and basin development (Ingersoll)
12:00 LUNCH
1:00 Southern California USR crustal structure (basins, schists thru Moho) (Plesch)
1:20 Breakouts with assigned tasks
2:00 Discussion: thickness, distribution, properties and mechanical role of the underplate schist; post-Laramide magmatism and effects on crust; Penn Ranges and restitic roots; Can we assign rock type and understand its origin everywhere in 3D? Major gaps in knowledge; what is needed?

PART 2: SEISMIC STRUCTURE
2:50 Overview: seismic structure: motivation and goals (Davis)
3:00 Full waveform tomography (Jordan)
3:20 Nature and 3D geometry of S. California Moho (Clayton)
4:00 Nature and 3D geometry of S. California upper mantle (Forsythe)
4:20 Southern California Crust and mantle Anisotropy (Tanimoto)
4:40 Southern California USR crustral structure (Plesch)
5:00 Breakouts with assigned tasks
5:30 Discussion: What is the origin of features in lower crust & uppermost mantle?
6:00 Discussion: What structural targets are of greatest priority? Because of ignorance or importance? How to integrate seismic results? Seismic and geologic knowledge? What techniques need to be developed? What else?


Day 2: Friday, March 7, 2008

PART 3: GEODYNAMICS AND STRESS
10:00 Overview: fault stress: motivation and goals (Humphreys)
10:00 What earthquakes tell us about crustal stress (Hauksson)
10:20 Constraints on fault stress from radiated energy (Heaton)
10:40 Lithospheric rheology and the role of the lower crust (Thatcher)
11:00 Modeling Stress (Bird)
11:20 Southern California Geodynamical Modeling (Fay)
11:40 Breakouts with assigned tasks
12:30 LUNCH
1:30 Discussion: stress in the crust and on faults (absolute levels and heterogeneity); what is needed
3:00 Adjourn

For more information, contact: Paul Davis and Gene Humphreys