Precise geodetic surveys were made before and after the JORUM underground nuclear explosion, which was detonated September 16, 1969, at the U. S. Atomic Energy Commission's Nevada Test Site. Strains calculated from these surveys show a relationship of the strain directions and magnitudes to the volcanic caldera collapse system of this area. Strains within the area 20 collapse zone show northwesterly compression and are similar in magnitude, whereas strains in other collapse zones are generally smaller and of different orientations. Distance was monitored over a 2-km range from 512 hr after the explosion to 5 days later. Five steplike distance changes were recorded during the first 412 hr of monitoring and none was recorded after that. One of the steps was in conjunction with an identifiable seismic event.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.