GEOLOGICAL INVESTIGATION OF A LANDSLIDE EMPLOYING SEISMIC EXPLORATION TECHNIQUE

SEISMIC REFRACTION INVESTIGATIONS, USING A ONE-CHANNEL SEISMOGRAPH, WERE MADE ON A LARGE LANDSLIDE THREATENING A 100-FOOT SECTION OF THE NORTHWESTERN PACIFIC RAILROAD ROUTE ALONG THE EEL RIVER NEAR ISLAND MOUNTAIN, CALIF. THE FRANCISCAN GROUP (FAULTED AND SHEARED META-SEDIMENTARY ROCKS WITH SERPENTINITE INTRUSIONS), AND THE OVERLYING SLIDE DEPOSITS ARE SEPARATED BY AN INTERMEDIATE ZONE DECLINEATED LARGELY OF CLAY CONTAINING BOULDERS. MOVEMENT PROBABLY TAKES PLACE ALONG SEVERAL SMALL, DISCONTINUOUS CURVED SURFACES PARALLEL TO THE HILLSIDE SURFACE. THE SLIDE APPARENTLY STARTED WITH A SMALL SLOPE FAILURE NEAR THE RIVER LEVEL AND HAS GROWN UPWARD AND OUTWARD. /GA/

• Authors:
  • James, W
• Conference:
  • Engineering Geology and Soils Engineering Symposium, Proceedings of the 6th Annual
  • Location: Boise ID, United States
  • Date: 1968-4-17 to 1968-4-19
• Publication Date: 1964

Subject/Index Terms

• TRT Terms: Exploration; Failure; Landslides; Refraction; Sedimentary rocks; Seismicity; Seismometers; Slopes; Till
• Uncontrolled Terms: Seismic investigations; Seismic refraction
• Old TRIS Terms: Geological explorations
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00229558
• Record Type: Publication
• Source Agency: Geophysical Abstracts
• Report/Paper Numbers: pp 97-103
• Files: TRIS
• Created Date: Aug 15 2004 1:50AM