South Coast Geological Society invites you to attend our joint meeting with SDAG on Monday, May 6 at El Adobe in San Juan Capistrano! We are excited to host Dr. Susan Hough, Research Geophysicist with the United States Geological Survey present her talk: A 30-year Retrospective on the Impacts and Lessons Learned from the 1994 Northridge Earthquake.


El Adobe de Capistrano

31891 Camino Capistrano

San Juan Capistrano, CA 92675

Meeting Cost:

Members (includes professors): $50

Non-members: $55

Students: $20

Please click “Attend Meeting” to register through Eventbrite.


June 17, 2024

Speaker: Dr. Susan Hough, USGS

Topic: A 30-year Retrospective on the Impacts and Lessons Learned from the Northridge Earthquake

When: Monday, June 17 (6:00PM – 8:30PM)


The 17 January 1994 Northridge, California, earthquake was a watershed event, with far-reaching societal and scientific impacts.  The earthquake, which occurred in the early days of both broadband seismic networks and the Internet, spurred advances in seismic monitoring, real-time systems, and development of data products.  Motivated by the 30th anniversary of the earthquake, I present a brief retrospective of the earthquake and its impact, and reconsider both ground motions and the aftershock distribution using modern tools and best-available data. With improvements in instrumentation and analysis methodology, recent earthquakes continue to reveal increasing complexity of ground motions, fault systems, and earthquake ruptures.  Even in the absence of data from state-of-the art instrumentation, a retrospective consideration of ground motion data from the Northridge earthquake reveals complexities beyond what could be characterized (and modeled) thirty years ago. Aftershock relocations for both the 1971 Sylmar and 1994 Northridge earthquakes also reveal an updated view of fault complexity.  I also describe outreach products produced as part of the anniversary commemoration.


Speaker Bio:

Dr. Susan Hough is Research Geophysicist with the United States Geological Survey, Pasadena, California field office.  She received an AB degree with honors in geophysics from the University of California at Berkeley in 1982, and a PhD in Earth Sciences from Scripps Institution of Oceanography in 1987.   Her research focuses on characterization of earthquakes and earthquake effects, the triggering of earthquakes by both human activities and other earthquakes, and historical earthquakes. She currently serves as lead Earthquake Response Coordinator for the USGS Pasadena office, and has led numerous USAID-supported risk reduction projects in Myanmar, Haiti, and Nepal.