Accession Number:

AD0611241

Title:

EARTH MOTION MEASUREMENTS.

Descriptive Note:

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s):

Report Date:

1961-01-01

Pagination or Media Count:

109.0

Abstract:

Several parameters of ground motion on two deep underground nuclear detonations Evans and Blanca are measured. Primary measurements included vertical acceleration and velocity in a deep hole over Evans zero, horizontal and vertical acceleration on the mesa surface, and horizontal surface strain. Additional data were obtained on vertical response spectra reed gage, surface subsidence liquid level, and aftershocks geophone listening Report WT-1740. Despite the less than satisfactory over-all results, some conclusions can be drawn on the basis of the data obtained. Arrival time studies seem to confirm earlier indications of a high speed layer in the Area 12 mesa at 300-foot depth. This layer was found to preclude general conclusions as to propagation mechanism or amplitudes measured at the surface. Subsurface motions although very small were consistent with scaling methods applied to prediction of Hardtack-II events.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE