APRIL 2003 PROGRAM:

When:      Tuesday, April 8, 2003
Where:     Spenger's Fresh Fish Grotto at 1919 Fourth Street, Berkeley!
Time:        6:00pm Social, 7:00pm Dinner, 8:00pm Speaker

Abstract:
                  The Serra fault is the northernmost fault in the Foothills thrust system, a zone of northwest-striking, southwest-dipping thrust faults adjacent to and northeast of the Peninsula segment of the San Andreas fault (SAF). The Serra fault lies approximately 1.5 to 3 km northeast of the SAF and extends for over 20 km from Hillsborough to near Daly City. New mapping of uplifted stratigraphic units exposed in the sea cliffs at Fort Funston in southwestern San Francisco provides evidence for late Pleistocene to late Holocene fold growth above a blind northwestern extension of the thrust fault. Bedding dips measured in the Merced Formation on the sea cliffs define a northeast-vergent monoclinal fold, which I interpret to be a fault-propagation fold forming above the Serra fault. An originally westward-graded, inset Holocene alluvial channel on the fold forelimb is now tilted east, demonstrating that folding above the Serra fault has continued into the Holocene, and that the fault can be considered active. Geometric relationships between the closely aligned SAF and the southwest-dipping Serra fault suggest that the Serra fault may intersect the SAF at a shallow non-seismogenic depth. Even if the Serra fault moves only aseismically during large magnitude SAF earthquakes, the Serra fault still poses a seismic hazard in the form of ground rupture where the fault reaches the surface. Any planned occupied structures, especially critical facilities (i.e. schools and hospitals), should be sited to avoid the Serra fault.

For more information, see the Newsletter Page (www.aegsf.org/newsletter.html) to download the current Newsletter! or Click Hereto directly download the Newsletter

The deadline for registration is NOON on FRIDAY, April 4th.
After this date, reservations cannot be guaranteed. Please make your reservation as soon as possible.
For financial reasons, meeting no-shows and last minute cancellations will be charged.
Please select a meal choice when making a reservation; the choices are salmon, chicken, or vegetarian.

For reservation info contact:
Chris Hundemer
Upp Geotechnology, Inc.
(p) 408-866-5436
(f) 408-866-9436
Send email to Chris Hundemer (treasurer@aegsf.org)

Hope to see you there,

Craig N. Reid
Webmaster