Abstract

In 1992–1993 a 2-D seismic grid was shot in the Rush Lake-Parowan Gap area of Iron County, Utah. The grid is comprised of 7 lines of high resolution 40 fold vibroseis data totaling about 36.5 line miles. The shoot was supplimented with about 12 miles of preexisting purchase data to fill in some gaps in the grid.

The resulting processed record sections from the shoot not only show the half-graben nature of the valley and it’s bounding faults, but also clearly defines much detail in the faulting which occurs within the Late Tertiary sediments themselves. The thickest section of sediments, and apparent depocenter of the basin, is located beneath Rush Lake. Rising abruptly from the depocenter, in the northern part of the basin is a significant fault bounded horst block or mid-basin platform.

The Pre-Tertiary section in the basin is not well imaged by the survey except for a few data segments on the western side.