Prehistoric Headwater Basin Debris Avalanches in Northern California Coast Ranges

This study explores the temporal association between prehistoric headwater basin encompassing debris avalanches and plate boundary earthquakes in the Northern California Coast Ranges. The research focuses on the size distribution, volume, and historic occurrences of landslides in the region, illustrating the impact of seismic events on the landscape over time. Through an analysis of landslides and debris avalanches, the study sheds light on the geological history and seismic activity in the area.

• Prehistoric Landslides
• Northern California
• Debris Avalanches
• Plate Boundary Earthquakes
• Geological History

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1. Prehistoric, Headwater-Basin- Encompassing Debris-Avalanche Landslides, Northern California Coast Ranges: Temporal Association With Plate Boundary Earthquakes Harvey Kelsey, Humboldt State University, Arcata CA Brian Sherrod, USGS, Seattle WA Steve Angster, USGS, Seattle WA J Scott Padgett, Geography, Durham Univ., UK

2. 0.8 Count in each bin (normalized to form a pdf) Size distribution: historic and prehistoric landslides 0.7 Prehistoric headwater-basin- encompassing debris avalanches n = 4 Avg volume = 4.93 x 106 Historic landslides 0.6 0.5 n = 978 0.4 Avg volume = 3.14 x 103 0.3 0.2 0.1 6 3 5 1 2 4 7 Log10 landslide volume (m3)

3. Red Lassic

4. Tilted trees on coherent mid-slope slide block

6. Tilted trees on coherent mid-slope slide block

7. Age coincidence CE 1902-1906:Inferred age of Mule Debris Avalanche April 18, 1906: San Francisco earthquake Northern California Coast Range: Felt intensities in the VI-VII range Mule Slide Modified Mercalli Intensity Map 1906 San Francisco Earthquake Boatwright and Bundock (2005)

8. Prehistoric, Headwater-Basin- Encompassing Debris-Avalanche Landslides: Temporal Association With Plate Boundary Earthquakes