A Proposed Geophysical Program of Exploration for Nebraska and the Dakotas

Abstract

The known geological information, particularly with reference to possible oil‐producing horizons, is discussed briefly. A method is proposed whereby the area is subjected to a reconnaissance seismic survey to determine the location of the major structural features, followed by other methods of successively higher resolving power in the favorable areas outlined by the reconnaissance.

Dinosaurs: A Jurassic Assemblage from Patagonia

“…2D), whereas the 1966 sequence did not (4,9). Improved instrumental coverage in 1966 revealed southeastward migration of small earthquakes in the months preceding the main shock toward its epicenter (9), while fresh cracks on the fault southeast of Parkfield 2 weeks before the 1966 main shock (16) are consistent with substantial precursory aseismic slip on the fault.…”