Coast Geological Society

Ventura, California

Special Announcements
  • CGS needs your help next season! We are looking for active members that are willing to serve on the Executive Committee. If you or someone you know would like to volunteer, please contact Eric White (

  • Do you have a presentation waiting to be heard? CGS is starting to plan the fall season and is searching for exciting talks! Do you have a talk or have you heard a presentation that would benefit the society? Please email the vice president (

Please Join CGS on Tuesday December 17th, 2019

Ken Hudnut, Ph.D., Science Advisor for Risk Reduction for the U.S. Geological Survey will present his talk titled:

Ridgecrest Earthquake Sequence Overview and Fault Interaction

Research Contributors include: Ken Hudnut (USGS) with Janis Hernandez & Alex Morelan (CGS), Beth Haddon (USGS), Dave Mencin (UNAVCO), Nano Seeber (LDEO) and Javier Pacheco (OVSICORI)


Regional map showing the Ridgecrest - China Lake - Searles Valley region along with mainshock event moment tensors, Little Lake fault zone traces, and other regional faults. Fault traces are based on USGS Quaternary Fault Database (USGS and CGS, 2019), Little Lake fault zone based on Bryant (2017). SSN = southern Sierra Nevada Fault, GF = Garlock fault. Surface projections of linearized preliminary finite fault models (FFM’s) from E. Thompson (pers. communication, 2019). Developed areas affected by earthquakes are indicated (Ridgecrest, China Lake Naval Air Weapons Station, Trona).

Link to paper HERE

Left: Helicopter Overflight Viewing Access Road Fault Offset. The CGS and USGS, along with National Guard and Navy personnel, view road damage showing 2.5 +/- 0.2 meters of right-lateral motion along the primary rupture associated with the magnitude 7.1 event. This offset access road was broken by the mainshock fault rupture about 600 m southeast of the China Lake playa (Credit: Ken Hudnut, USGS. Public domain)

Right: Hudnut, along with Bob Fenton (FEMA) and Mark Ghilarducci CalOES ) describes 2019 Ridgecrest earthquake sequence preliminary scientific findings and impacts to Vice President Pence and Karen Pence on board Air Force Two, less than one week after the M 6.4 and M 7.1 earthquakes struck. (Official White House Photo D. Myles Cullen).

Read more about the talk HERE


The monthly CGS meeting is held at the Poinsettia Pavilion in Ventura!

Meeting Schedule:

6:00 - 7:00 PM: Social Hour - Snacks and Beverages 

7:00 - 7:30 PM: Dinner Service

7:30 - 8:00 PM: Announcements & Raffle

8:00 - 9:00 PM:  Main Presentation

RSVP for the meeting on Decmeber 17th 2019 HERE

Download a flyer about the meeting this month HERE

December 2019 Sponsor
CGS would like to thank Numeric Solutions, LLC for sponsoring the December 2019 meeting!

Numeric Solutions provides high quality advisory and consulting services to navigate the ever-changing economic and regulatory landscape of the energy and water sectors.

Numeric Solutions was founded in 1999 on the guiding principle of providing excellent technical work, customer service, and maintaining a client-consultant working framework that promotes rigorous and adaptive approaches to addressing client issues.

Our typical clients are:

  • Oil and gas development companies
  • Midstream and oil and gas infrastructure companies
  • Energy sector investment firms (e.g. Private Equity and Hedge Funds)
  • Municipal water districts
  • Agricultural businesses
  • Mineral owners
  • Land owners and land management companies

Check out their website HERE

CGS is proud to be affiliated with the PSAAPG