Passive seismic studies use natural wave propagation through the earth.

Opinions differ as to whether seismic studies have imaged such a structure.

The dispute began when Occidental set out to obtain an environmental license to conduct seismic studies in the region.

The seismic and gravity studies and the drilling all produced data consistent with the impact theory.

Since 1988, seismic studies conducted by private oil companies in Colombia have dropped by about two-thirds.

The regional offshore Netherlands study was subsequently updated during 1985 with further seismic related studies.

Several experiments, including seismic studies, were carried out.

A seismic study in 1995-1996 confirmed the danger of the fault to the campus.

Three-dimensional seismic studies of oil and gas reservoirs help the industry better identify the most promising places to drill.

The lunar rocks were full of surprises, which complemented those made in gravitational and seismic studies.