New geochronologic methods and results from southern California fault studies
Conveners: Kate Scharer and Ramon Arrowsmith
Date: October 28, 2014
Location: Kellogg West Conference Center, Pomona, CA (Auditorium)
SCEC Award and Report: 14169

OVERVIEW: The adage “no dates, no rates” remains valid: understanding earthquake processes requires that the rates of fault slip and the ages of past earthquakes are determined by dating geomorphic markers and bounding sedimentary surfaces. Over the last five years, SCEC’s SoSAFE and earthquake geology research has advanced dating methods; the work includes basic research on sample collection and laboratory analysis, application and comparison of multiple dating methods at single sites, and better understanding of the integrated history of Quaternary features whose formation is modulated by tectonic and climatic forcing. The purpose of this one-day workshop is to communicate details of these advances in order to improve field plans, sampling strategies, laboratory techniques, and date interpretation. We anticipate that the workshop will promote improved future studies, a better understanding of the uncertainties in the new dates, and further innovations in geochronology.

The workshop will focus on luminescence dating, exposure and burial dating of alluvial fans with terrestrial cosmogenic nuclides (TCN), and uranium series dating of pedogenic carbonate. The agenda will focus on (1) sampling and analytical strategies, (2) discussion of assumptions, and (3) interpretation and comparison of results. These subjects will form the body of a workshop report, which will include sampling and analysis guidelines for each method, and also summarize our concluding discussion on future needs and approaches for SCEC geochronology.

PARTICIPANTS (45 total): Sinan Akciz (UCLA), Ramon Arrowsmith (ASU), Kim Blisniuk (BGC), Jose Cardona (CSUN), John Conrad (UCR), Michele Cooke (UMass Amherst), Jillian Daniels (UCLA), Duane Devecchio (ASU), Brent Goehring (Purdue), Peter Gold (UT Austin), Lisa Grant Ludwig (UCI), Jessica Grenader (USC), Alex Hatem (USC), Richard Heermance (CSUN), Janis Hernandez (CGS), Alan Hidy (LLNL), Tran Huynh (USC), Kaitlyn Jones (CSUN), Katherine Kendrick (USGS), Emily Kleber (ASU), Mike Lawson (UCLA), Robert Leeper (USGS), Chris Madugo (PG&E), Shannon Mahan (USGS), Gayatri Marilyani (ASU), Sally McGill (CSUSB), Chris McGuire (UCLA), Chris Milliner (USC), Brian Olson (CGS), Nate Onderdonk (CSULB), Mike Oskin (UC Davis), Lewis Owen (U Cinicnnati), Veronica Prush (UC Davis), Ani Pytlewski (CSULB), Ed Rhodes (UCLA), Tom Rockwell (SDSU), Barrett Salisbury (ASU), Kate Scharer (USGS), Warren Sharp (BGC), Ashley Strieg (Oregon), Nathan Toke (UVU), Josh West (USC), Doug Yule (CSUN), Susan Zimmerman (LLNL), and Robert Zinke

(USC)

Presentation slides may be downloaded by clicking the pdf links following the title. PLEASE NOTE: Slides are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.

TUESDAY, October 28, 2014