Geologist Tom Leroy will present "Tsunamis of the Tolowa Coast" on Sunday from 1 to 4 p.m.
The event includes a slide show followed by a 2-mile round-trip hike. Participants should meet at the Lake Earl Wildlife Area Information Center, 2591 Old Mill Road, Crescent City.
The slide show will focus on the origins and dynamics of coastal dunes and how earth movement and tsunamis continually shape the North Coast's landscape and shore.
Del Norte County's coastal dune fields present a unique opportunity to investigate historic tsunami evidence. Leroy will share some of the latest information from last year's March 11 earthquake and tsunami in Japan, which heavily destroyed the docks at Crescent City Harbor.
He'll show evidence from geological core sampling and other lines of reasoning that indicate how historic and ancient tsunami events have inundated the Tolowa Coast for thousands of years.
A 2-mile round-trip hike into the dunes follows the slide show, during which participants can observe firsthand the geologic evidence of this area's unique tsunami history.
Wear comfortable hiking shoes, bring drinking water, snacks and insect repellent.
Leroy works as an associate geologist for Pacific Watershed Associates in McKinleyville. He specializes in watershed analysis and erosion control, and works on complex projects for public and private land managers.
His experience also includes coastal geomorphology, seismic and tsunami hazard assessment, neotectonics, landslide and sediment inventory and environmental restoration.
Summer programs are sponsored by the Redwood Park Association and the Tolowa Dunes Stewards in collaboration with California State Parks and the California Department of Fish and Game.
For more information: Sue Calla 465-61911.