SEISMIC REFLECTIONS FROM SHALLOW DEPTHS

A new method for the detection and identification of seismic reflections from shallow depths has been developed. The method uses a single-channel signal enhancement seismograph usually used for refraction surveys. Common reflection point, single- and double-ended spreads were field tested; results indicated that the latter two geometries were sufficient. Geophone arrays and low-cut filters were used to attenuate unwanted seismic arrivals. Enhancement of time-coherent signals is used to identify reflections. Several reflection seismograms were obtained close to stratigraphically-logged wells. Conversion of reflection times to depths using known velocity structures showed good agreement between depths from logs and from seismograms. At present, the depth range capability for the method is from less than 20 feet to more than 600 feet. Several geotechnical fields will benefit the addition of the shallow reflection methods to the subsurface investigation techniques currently used.

• Supplemental Notes:
  • This article is an excerpt from the Proceedings of the Fourteenth Annual Engineering Geology and Soils Engineering Symposium that was sponsored by Idaho Transportation Department, Division of Highways; University of Idaho, Department of Geology and Department of Civil Engineering; Idaho State University, Department of Geology and Department of Engineering; and Boise State University, Department of Geology, and Department of Physical Science and Engineering. This symposium was held at the Rodeway Inn, Boise, Idaho, and was hosted by Boise State University.
• Corporate Authors:

  Idaho Department of Highways

  P.O. Box 7129
  Boise, ID  United States  83707
• Authors:
  • Gilmer, T H
• Publication Date: 1976-4-9

Media Info

• Features: Figures; References;
• Pagination: p. 71-83
• Serial:
  • Engineering Geology & Soils Engineering Symp Proc
  • Publisher: Idaho Department of Highways

Subject/Index Terms

• TRT Terms: Geological surveying; Geophones; Reflection; Refraction; Seismicity; Seismographs; Signals
• Old TRIS Terms: Seismic reflection; Seismographic methods (Soil surveys); Shallow seismic refraction method; Subsurface explorations
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00142675
• Record Type: Publication
• Files: TRIS, STATEDOT
• Created Date: Feb 1 1977 12:00AM