South Coast Geological Society



South Coast Geological Society Newsletter

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Meeting Date: Monday, June 5th, 2017
at the DoubleTree Club Hotel, Santa Ana, CA
Guest Speaker:  

Robert Leeper
Ph.D. Candidate
University of California, Riverside


Newly identified seismic hazards along the Newport-Inglewood fault zone: Evidence for repeated late Holocene coseismic subsidence events in the Seal Beach saltmarsh
Paleoenvironmental records from the Seal Beach saltmarsh reveal evidence for repeated late Holocene coseismic subsidence events along the Newport-Inglewood fault zone. Field analysis of sediment gouge cores established discrete lithostratigraphic units extend across the saltmarsh. Detailed sediment analyses of vibracores reveal abrupt changes in lithology, percent total organic matter, grain size, and magnetic susceptibility. Diatom and foraminiferal analyses indicate that predominantly freshwater deposits bury relic intertidal deposits at three distinct depths. Radiocarbon dating indicates that the three burial events occurred in the last 2000 calendar years and that two of the three events are contemporaneous with large-magnitude paleoearthquakes along the Newport-Inglewood/Rose Canyon fault system. From these data, and extensive oil and water well data from across the Sunset Gap, it is inferred that during large magnitude earthquakes a step-over along the fault zone results in the vertical displacement of a roughly 5-km2 area that is consistent with the footprint of an estuary identified in pre-development maps. These findings provide new insight on southern California seismic hazards, including coseismic deformation and earthquake recurrence along the Newport-Inglewood/Rose Canyon fault system.

Click Here to RSVP for the Meeting!

In this edition:

  • Meeting Information
  • Presidents Corner
  • 2017 Membership
  • Corporate Sponsors
  • Upcoming Events
  • May Meeting Highlights
  • Geology Fun

Meeting Information
6PM – Social Hour
7PM – Dinner
7:45PM- Presentation
DoubleTree Club Hotel

7 Hutton Centre Dr.
Santa Ana, CA
Member $30
Non-Member $35

Student/Professor $15

Robert Leeper
Ph.D. Candidate,
Department of Earth Sciences at University of California, Riverside

Speaker Biography:

Robert Leeper is currently working to earn his PhD at the University of California, Riverside (UCR), where he is analyzing postfire hydrologic response processes in the San Gabriel Mountains (SGM). Robert’s research interests primarily focus on identifying sedimentary evidence of Holocene natural hazards such as wildfires, debris flows, landslides, tsunamis, and earthquakes, which can be used to establish chronologies of past events crucial for increasing hazard resilience and reducing future risk. Prior to attending UCR, Robert earned his Bachelor’s and Master’s degrees in geology in 2013 and 2016, from California State University, Fullerton. Between 2007 and 2016, Robert worked for the U.S. Geological Survey in Pasadena, California, researching a variety of natural hazards. During this time, his professional research overlapped with his academic research studying postfire debris flows and flash floods in the SGM, paleotsunami in Thailand and along the California coastline, and paleoseismology along the Newport-Inglewood fault zone.

Presidents Corner  

Greetings SCGS,

I’m finding it hard to believe we are only half way through the year with so many events, classes and meetings already behind us.  I’m also looking forward to what we have planned for the remainder of the year, including joint meetings, Angels game outings, our Cooper Center meeting and of course the annual fieldtrip.  Your volunteer officers are working hard to make this an enjoyable and memorable year.  High fives are appreciated.

Our next meeting will be held at our normal venue, the Doubletree Club hotel on June 5th, 2017.  Robert Leeper will be presenting his newly published research on the co-seismic subsidence of the Seal Beach marshlands.  Robert has been collecting data over the past few years refining his findings, interpretations and conclusions.  You won’t want to miss this one.

Please remember to RSVP on or before Friday June 2nd to avoid late fees.  Our agreement with the hotel states that an official head count is to be communicated by the end of Friday.  SCGS incurs additional charges per plate for additional unexpected guests that don’t inform us ahead of time of their attendance.  A big thanks to all those who get their reservations in by Friday.

Wednesday, July 19th will be our annual joint meeting with SDAG, ASCE, and AEG the meeting will take place at the El Adobe restaurant in San Juan Capistrano.  Directions will be provided in the newsletter and Eventbrite reminders.  We are pleased to have Michael Reader of Group Delta presenting.  His talk is titled, “Investigations in the Hollywood AP Fault Zone for Millennium Development and Adjacent sites.”  More details can be found in the newsletter.  Please RSVP early as we expect a capacity crowd for this meeting.

For those of you already interested in the 2017 fieldtrip, progress is being made.  My Contact at Ormat Geothermal has agreed to either a site tour, depending on the volume of people attending, or a talk by personnel on the plant operations and site geology of the North Brawley plant.  This will be part of our Friday activities, along with off-set Indian fire rings, Palm oases, obsidian domes and an overview of the Salton Sea’s pending future before retiring to camp.  We will be dry camping in the Box Canyon area for Friday and Saturday night, November 3rd and 4th.  Bathrooms will be provided, I’m planning on 4 porta-pottys with sinks.  Dr. Art Sylvester will be leading the group to some “World-Class” geologic sites on Saturday in Painted Canyon and Sunday will be half a day exploring the adjacent Box Canyon.  The trip will conclude at the Coachella Valley Brewery around sundown on Sunday, November 5th.  A huge thanks to all who have helped with planning and research in preparation for this trip.

Tickets are still available for our Angels game outing to the August 26th game against the Astros. The game starts at 6pm on Saturday night.  Cost is $20 dollars per ticket.  Please sign up at one of our upcoming meetings or email us at SCGS.MGMT@GMAIL.COM to reserve your tickets.  Please bring your friends and family and have a great night with your fellow SCGS members.

If you are not already a member of South Coast Geological Society, we would love to have you sign up.  Members receive discounts on meetings, merchandise, fieldtrips and outings.  Student membership is still highly discounted at the unbeatable price of free.  Regular membership remains at 20 dollars for the calendar year.  With fieldtrip sign-ups around the corner its best to get your membership in soon.

Lastly, I’d like to thank all our Corporate Sponsors, devoted Honorary Members and all the volunteers & members who help make the SCGS function and grow.  Without your contributions and support we wouldn’t be able to accomplish all that we do.

I hope you all have a great Memorial Day weekend and I look forward to seeing you at the next SCGS event!

Greg Shagam
President 2017

Greg Shagam, SCGS President

 SCGS Membership Drive 

We welcome you to join SCGS, one of the largest, most active Geological Societies in Southern California. A membership to South Coast Geological Society has many benefits including discounted meeting, field trip costs, subscription to monthly newsletters, announcements for exclusive field trips, events, job postings and more!

Membership Costs:
Professionals: $20 / year
Students: Free

Membership can be paid online via pay-pal, check by mail, or in person at a SCGS Meeting/Event where we accept cash, checks, and cards. Please visit our membership page for the Online Membership Application and Pay-Pal Payment Link.

Our mailing address is:
South Coast Geological Society
P.O. Box 10244
Santa Ana, CA, 92711-0244

*Membership rates will increase to $35/year, effective in 2018

SCSG Membership Application

South Coast Geological Society Corporate Sponsorship

SCGS greatly appreciates our Corporate Sponsors! Corporate sponsorship allows SCGS to host stellar field trips, provide annual scholarships, and publish guidebooks. 

There are three Corporate Sponsorship Levels,
GOLD – $500 
SILVER – $250
BRONZE – $100

Click HERE for Corporate Sponsor Webpage

 2017 Corporate Sponsors 

Upcoming Events!

May Meeting Highlights

Thank you to our members who joined SCGS for another interesting meeting! Thank you Dr. David Oglesby for your great presentation on Fault Dynamics and Tsunamis!

Dr. Olgesby, May 2017 meeting!

Geology Fun

Copyright © 2017 South Coast Geological Society, All rights reserved.
Our mailing address is:
South Coast Geological Society
P.O. Box 10244
Santa Ana, CA, 92711-0244

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