We hope you will join us for our second 2026 AEG Inland Empire meeting. The meeting will be held Wednesday, February 11, at BJ’s Restaurant and Brewhouse, 2520 Tuscany Street, Corona, CA 92881. Looking forward to seeing you there!
UPCOMING MEETING NOTICE
*** Wednesday, February 11, 2026 ***
Download the Announcement 
| Topic: | Legacy and Recurrence of Bedrock Landslides in the San Gabriel Mountains, California |
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| Speaker: | Dr. Nicolas Barth, Associate Professor of Geology, University of California, Riverside |
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| Date: | Wednesday, February 11, 2026 Social hour: 6:00 pm Dinner: 7:00 pm Presentation: 8:00 pm |
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| Location: | BJ’s Restaurant and Brewhouse 2520 Tuscany Street Corona, CA 92881 |
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| Cost: | $45 per person with advance reservations for AEG members, $50 for non-AEG members, $50 for anyone without reservations (at the door), and $10 for students with a valid student ID and current AEG Student membership; the Student Membership is FREE, but it sometimes takes a few days to receive a student membership. |
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| Food: | Entree and Pizza Buffet |
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| RSVP: | Registration has closed as of 12:00pm on February 9, 2026. With questions, please email meetings@aeg-ie.org. | Email AEG-IE at meetings@aeg-ie.org Please make reservations prior to 12:00pm on February 9, 2026. |
| Presentation Summary: | |
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More than 90% of the 2400 km2 catchment area of the actively uplifting San Gabriel Mountains (SGM) drains southward towards Los Angeles, the second largest metropolitan area in the United States, through an extensive reservoir and flood control system. In terms of downstream effects, the SGM is arguably one of the most important mountain ranges in the United States. The prevailing view is that short-return fire-flood-debris flow cycles dominate denudation of the SGM, however, emerging research suggests the role of bedrock landslides is likely significantly underappreciated. This talk will highlight (1) geochronology results that demonstrate that some of the largest landslides in the SGM formerly thought to be Early Quaternary in age (1-2.5 Ma) occurred during the Late Holocene, (2) a bedrock landslide inventory of the SGM with over 11,000 landslide deposits that significantly increases their known abundance, and (3) case studies of major landscape effects including 150m vertical aggradation pulses and drainage reorganizations driven by landslides. This new perspective has important implications for the Los Angeles region, particularly if many of these landslides are coseismically triggered. To our knowledge the SGM landslide inventory (LSI) is the only systematic, range-scale, lidar-resolution inventory of its kind in the world to date; the talk will also cover some of the novel techniques employed to produce this LSI, example spatial analyses it enables, and ongoing efforts to have the database incorporated into the California Geological Survey’s statewide LSI. |
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| Speaker Biography: | |
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Nicolas Barth is an Associate Professor of Geology at the University of California, Riverside. He received a BSc & MSc in Geology at UC Santa Barbara and a PhD at the University of Otago in New Zealand. Among diverse research interests, his main aim is to improve our understanding of active faults, bedrock landslides, and the evolution of landscapes. |
