CONVENERS: Julian Lozos (CSUN), Nate Onderdonk (CSULB), and Craig Nicholson (UCSB)

SUMMARY: SCEC has designated Cajon Pass as the initial area for focused research on the behavior of “Earthquake Gates” (https://www.scec.org/research/ega). Earthquake Gates are areas along a fault or within a fault system, often at major fault intersections, where some ruptures have stopped, while others have passed through. The primary science questions for Earthquake Gates include:

1. How do fault intersections affect the probability of through-going earthquake ruptures?
2. How do 3D fault geometry and stress variations modulate these through-going rupture probabilities?
3. How do prior ruptures affect future rupture paths and probabilities?
4. Does the current stress field reflect recent rupture history or is it more influenced by other factors?

We will hold a field trip and workshop to bring together researchers from various fields of earthquake science to present recent results pertaining to the Cajon Pass Earthquake Gate, and to determine future research directions. The field trip on Saturday, Sept. 8 will include multiple stops in and around the Cajon Pass region. Following the field trip, we will hold a half-day workshop on Sunday where new advances will be presented and future research directions will be explored for the Cajon Pass as an earthquake gate. We encourage anyone currently working on, or interested in the questions outlined above to apply. We welcome expertise in earthquake geology, seismology, modeling, and the Cajon Pass region. The Sunday presentations and discussion session will be open to as many people as possible, but because of logistical constraints, the field trip will be limited to 35 participants. Participants will be selected based on the level and relevance of their research interests in Cajon Pass and the Cajon Pass EGA Initiative.

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 They may contain unpublished or preliminary information and should only be used while viewing the talk.

Saturday, September 8, 2018 (FIELD TRIP)

Sunday, September 9, 2018 (WORKSHOP)