Surface and subsurface data from the Sulaiman thrust belt show that nearly all
the 10 km thick sequence of dominantly platform (>7 km) and molasse strata is detached
at the deformation front. These strata thicken tectonically to a minimum of 20 km in the
hinterland of the Sulaiman fold belt...
The Whitewater River area is located directly east of Mt. Jefferson in the Cascades of central Oregon. Approximately 90 mi2 (230 km2) were mapped (scale 1/24,000) and four new K-Ar ages and 151 major element analyses were obtained in a study of the stratigraphic
and magmatic transition from the Miocene...
A study conducted along the Lincoln County, Oregon coast delineated the exact location of 153 landslides. The landslides were found through the interpretation of aerial photographs. Each landslide was verified in the field and its class (ancient, historic, recent), type (slump, debris slide or flow, planar slide),, and status (stable,...
A zone of diffuse deformation -600 km-wide extending from northern California to Washington has developed resulting from the oblique subduction of the Juan de Fuca plate beneath North America, and the northwestward migration of the Pacific plate. This zone is marked by a change in structural style from transtension in...
A 5km swath-width SeaMARC I sidescan sonar survey, conducted over
the zone of overlap between the southern rift zone of Axial Volcano and the northern
tip of the Vance spreading segment on the Juan de Fuca Ridge (between 45°24'N
and 45°50'N latitude), was analyzed to locate the present position of...
The Grant Range, in east-central Nevada, is a
north-east trending range bounded on the west by a
west-dipping normal fault system. Rocks within the range
record a complex polyphase Mesozoic ductile
compressional and Cenozoic brittle extensional
deformational history. The northwestern Grant Range
exposes deformed, regionally metamorphosed and
unmetamorphosed, Cambrian to...
The Whittier fault forms the central part of a fault system extending
from the East Montebello fault at Whittier Narrows to the Elsinore fault,
which is traced as far as the Mexican border. The Whittier fault forms a
restraining bend in this fault system, resulting in uplift of the Puente...
The northern Los Angeles basin is influenced by two structural styles: the west-trending compressional Transverse Ranges to the north, and the strike-slip Peninsular Ranges to the south. The interaction of these two structural styles has resulted in a complex fold fault belt at the northern margin of the Los Angeles...
The southeastern Cuyama Valley is located in the southern Coast
Ranges, west of Bakersfield, California. Subsurface geologic mapping
using data from 62 prospect wells was integrated with surface mapping
to determine the depositional and deformational history of this part
of the Neogene Cuyama basin.
The northwest-trending Russell fault system was...
Gravity and seismic data obtained by the geophysical group at
Oregon State University on the R/V YAQUINA during 1969, 1971, and
1973 plus other available data over the area just west of Nicaragua
and Costa Rica indicate the tectonic complexity of the region. Gravity
measurements show negative free-air anomalies over...