Coast Geological Society

Ventura, California

New for the 2017 - 2018 Season!
Make a One-Time Donation of $180 to a receive a 2017-2018 SEASON PASS

SEASON PASS includes:
  • Membership for the 2017-2018 season
    • Regularly $15
  • One meal for every meeting during the 2017-2018 season
    • 9 meals x $20 = $180

Season Pass Cost: $180
Savings: $15

The Coast Geological Society is a Non-Profit Organization
Every Season Pass is Tax Deductible!

Credit card payment and payment by check accepted at the meeting.

Pay through the website via Paypal by clicking on the logo to the right.

2017-2018 Season Pass
The Coast Geological Society would like to invite you to the first meeting of the 2017-2018 season!

The first meeting will be on Tuesday, September 19th 2017

Laura Reynolds (Ph.D. candidate at the Univeristy of California, Santa Barbara) will present her talk titled:

Evidence for Holocene coseismic subsidence along the Rincon Creek Fault, Carpinteria, California

CGS would like to thank Optimal Technology for sponsoring the September 2017 meeting!

Optimal Technology is an environmental field services company and since 1990 has been specializing in field chemistry services with a strong emphasis on soil vapor testing. Soil vapor testing is a rapid, reliable and cost effective method of screening for volatile organic compounds (VOCs) in the subsurface. Soil vapor surveys are designed to provide both timely and valuable data, enabling the field investigator to assess the distribution of VOCs in the subsurface. 

Optimal Technology is a California ELAP certified mobile laboratory (#2779) and a licensed and bonded C-57 Well Drilling contractor (#1023733). Optimal Technology’s qualified personnel and on-site laboratory grade instrumentation offers state-of-the-art soil vapor sampling and testing as well as soil sampling. These services provide reliable, professional, and near real-time analytical data in support of most environmental field activities. Optimal Technology adheres to stringent quality assurance, ensuring the delivery of an effective soil vapor survey.

Click the logo to check out their site!

September 19th 2017 Talk:

Evidence for Holocene coseismic subsidence along the Rincon Creek Fault, Carpinteria, California




Coseismic subsidence is a coastal hazard commonly associated with subduction zones. Although discrete coseismic events have also been proposed for tectonic basins and synclines along non-plate boundary active margins, confidently differentiating the signal of true coseismic subsidence from nonseismic processes such as floods, eustatic sea level or sediment flux-driven transgressions, local morphological changes such as barrier breaching, and anthropogenic-induced subsidence is difficult. Here we show lithological, geochemical, and fossil evidence for an abrupt subsidence event in Carpinteria Marsh, Carpinteria California at 1.0 ± 0.1 ka. At an elevation of -2 to -4 m throughout the estuary, an organic-rich mud containing marsh invertebrates is sharply overlain by a blue-gray sand containing articulated, intertidal to subtidal shells. We interpret this contact to represent up to 3.47 ± 0.5 m of coseismic compaction and subsidence due to movement along the Rincon Creek Fault; an amount similar in magnitude to that observed along subduction zones. The age of the subsidence event at 1.0 ka in Carpinteria overlaps in time with the age of a large uplift event documented at Pitas Point, Ventura. Correlation between the two events may support the potential for large scale ruptures within the Ventura/Santa Barbara regions.

Laura Reynolds, University of California, Santa Barbara

Speaker's BIO:

Originally from New Hampshire, Laura moved to Santa Barbara to work on a PhD in Geological Sciences with Dr. Alex Simms at the University of California Santa Barbara in 2012. She will finish her degree in January, 2018. Her research explores how coastlines have evolved over the Quaternary period. Her current research focuses on how estuarine stratigraphy reflects the interplay of sea level, tectonics, flooding, and anthropogenic changes, and how these processes have influenced the coastline over time. 

Check out Laura's website to learn more about her research HERE

CGS is proud to be affiliated with the PSAAPG