To quantify the postpeak residual capacity and
to gain insights into the load transfer mechanism of a shear
wall, nail connection tests were performed on salvaged
connections after a monotonic shear wall test loaded up
to peak load. Experimental results reveal that there is a
loss of strength in most...
The objective of this study was to develop and validate practical modeling methods for investigating load paths and system behavior in a realistic, light-frame wood structure. The modeling methods were validated against full-scale tests on sub-assemblies and an L-shaped house. The model of the L-shaped house was then modified and...
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
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massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
Wood shear walls are the main lateral force-resisting system for wood-frame construction. Water intrusion and subsequent decay around connections can significantly impact shear wall behavior, but these problems are seldom studied. In this study, effects of water intrusion and fungal attack on shear wall capacity were examined using small-scale (610-...
Approximately 4,210 feet of Late Cretaceous and 1,440 feet of Tertiary sedimentary rocks are exposed in the Salt Wells Anticline area of southcentral Sweetwater County, Wyoming. Late Cretaceous units include the Blair, Rock Springs, Ericson, and Almond Formations of the Mesaverde Group and the Lewis Shale; Tertiary units include the...
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debris are the most extensive Quaternary
deposits.
The Late Cretaceous rocks of the Rock Springs Uplift
The goal of this study was to develop an understanding of the nature of wave loading on a wood-framed scale residential building model for a variety of building configurations and test conditions. Testing was performed on a 1/6th scale two-story wood-framed residential structure. The structure was impacted with waves and...
The objective of this project was to evaluate system effects and further define load paths within a light-frame wood structure under extreme wind events. The three-dimensional 30- by 40-ft (9.1- by 12.2-m) building, designed to be representative of typical light-frame wood construction in the southeastern coastal region of the United...
In this thesis, we present the first detailed, long-term seismotectonic studies of oceanic
ridge-transform systems. The proximity of the Juan de Fuca plate to a network of
broadband seismic stations in western North America provides a unique synergy of
interesting tectonic targets, high seismicity, and recording capabilities. Our main tools...
Detailed surveys of several segments of the Peru Trench show
that the region between 6° to 10⁰ S is an area of recent deformation.
Seismic reflection records across the axis of the trench show faulting,
uplift, and tilting of the sedimentary fill and the acoustic basement.
Uplift of the acoustic...
The Virgin Valley-McGee Mountain area is located in the northwest
corner of Nevada in the northwestern part of the Basin and
Range structural province.
Rocks within the area consist predominantly of Miocene to
Pleistocene volcanic rocks and volcanic derived sedimentary rocks.
The volcanic rocks include rhyolite, rhyolite welded tuffs, and...
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north-
west corner of Nevada in the northwestern part of the Basin and
Range structural province
The Gorda Escarpment is a north facing scarp immediately south of the Mendocino transform fault (the Gorda/Juan de Fuca-Pacific plate boundary) between 126°W and the Mendocino triple junction. It elevates the seafloor at the northern edge of the Vizcaino block, part of the Pacific plate, ~1.5 km above the seafloor...
A thick sequence of intercalated andesite and basalt flows, tuffs, and volcanic sediments crop out in the Fly Creek Quadrangle and the north half of the Round Butte Dam Quadrangle. This sequence was deposited in the ancestral Deschutes River Valley along the east flank of the Cascade Range during the...
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characterized by phenocrysts
of basaltic hornblende crops out in the northeast corner of the area
and serves
Radiometric ages (K-Ar and ⁴⁰Ar-
³⁹Ar methods) have been determined on dredged
volcanic rocks from seven of the New England
Seamounts, a prominent northwest-southeast trending
volcanic lineament in the northwestern
Atlantic Ocean. The ⁴⁰Ar-³⁹Ar total fusion and
incremental heating ages show an increase in
seamount construction age from southeast to...
The Upper Cow Creek Watershed assessment has two goals:
1) To describe the past, present, and potential future conditions that affect water quality and fish habitat within the Upper Cow Creek Watershed; and
2) To provide a research-based action plan that suggests voluntary activities to improve fish habitat and water...
This report describes the hydrodynamic testing and
evaluation of a one-tenth scale model of the FMC Wave
Attenuation Device. The purpose of the test was to quantify
the wave attenuation characteristics and structural loading
induced by a test program of monochromatic incident waves
on the submerged structure. The device was...
The Rock Creek area consists of 53 square miles located in
the eastern foothills of the Pioneer Mountains, Beaverhead County,
Montana. Approximately 8, 500 feet of late Paleozoic and early
Mesozoic contact-metamorphosed sedimentary rocks and late Mesozoic
sedimentary rocks are exposed in the area of study.
Most of the late...
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intrusive rocks occupy the southwestern corner
of the area mapped and compose part of the eastern margin of
The Greenstone Mountain area, which includes the Utopia mining
district, is located in the foothills of the Pioneer Range, Beaverhead
County, Montana. Approximately 12, 600 feet of Paleozoic and
Mesozoic sedimentary rocks and an undetermined thickness of Precambrian
sediments and Late Cretaceous igneous rocks are exposed
within the area of...
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parts of the area.
At least three valley glaciers advanced into the northwestern corner
of the area in
The upper Eocene to lower Oligocene Oswald West mudstone is
the oldest formation (informal) in the Green Mountain-Young's
River area. This 1,663 meter thick hemipelagic sequence was deposited
in a low-energy lower to upper slope environment in the Coast
Range forearc basin. The formation ranges from the late Narizian
to...
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oceanic
plate at the base of the continental slope of the North American
plate caused extensive uplift
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
The thesis area covers 165 square miles including the greater
part of the northeastern quarter of the Mitchell quadrangle in north-central Oregon. The three stratigraphic units exposed in the area
consist of a variety of Tertiary volcanic rocks including the Clarno
Formation, the John Day Formation, and the Columbia River...
Within 40 square miles of the southeastern Wallowa
Mountains, Oregon, eugeosynclinal Permian and Triassic
formations comprising a section about 25,000 feet thick
have been exposed by uplift and erosion of overlying
Miocene Columbia River basalt. Deposition appears to have
been continuous from Permian into Upper Triassic, but an
apparent angular...
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s section about 25,000 feet thick
have been exposed by uplift and erosion of overlying
Niocene
The purpose of this study was to test two hypotheses. The first
hypothesis interprets allochthonous rocks in the Willow Creek area of the
Pinyon Range as lying on flat, superficial thrusts that truncate the
underlying folded Mississippian rocks of the Antler flysch sequence.
The second hypothesis interprets the allochthonous rocks...
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in Late Devonian time was marked by
uplift and erosion or nondeposition in the study area. A west
Himalayan collision produced frontal and lateral
ramps and associated Pliocene to Quaternary tectonic
geomorphic features in the foreland fold-thrust belt of
northwestern Pakistan. The transpressional right-lateral
Kalabagh tear fault zone displaced the emergent Surghar
Range frontal thrust from the western Salt Range by 16-19
km since 1.9-2.1 Ma: the age...
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the distribution of Indus River conglomerates
during the late Pliocene and Quaternary. Uplift in the
The Cedar Creek area, consisting of about 30 square miles, is
located on the west flank of the central Madison Range in Madison
County, Montana.
The rocks of the area include carbonates, sandstones, mudstones,
cherts, phosphorite, metamorphic rocks, intrusive igneous
rocks, and unconsolidated sediments and have been divided into 16...
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uplift, initiated normal faulting in the area.
Stream erosion and several cycles of glaciation have
The thesis area includes 54 square miles of the southeastern
Cuddy Mountains in west-central Idaho. The oldest rocks within the
area are plutonic phases of the Jurassic Cuddy Mountain complex.
These and Cretaceous (?) intrusive and associated (?) extrusive rocks
and nearby Triassic to Early Jurassic metasedimentary and metavolcanic
rocks...
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, although modified by erosion, has resulted from Late
Tertiary and Quaternary uplift by vertical to steeply
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...
The mapped area is part of the middle Deschutes Basin of central Oregon, which lies in the northwestern corner of the High Lava Plains physiographic province, between the Cascade and Ochoco Mountains. It is underlain by Cenozoic lavas, tuffs and sediments of continental origin. The oldest rocks in the sequence...
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lies in the northwestern corner of the High Lava Plains
physiographic province, between the Cascade
The northwestern corner of the Basin and Range Province (NWBR) lies in southeast Oregon where extensive Late Miocene, mafic to bimodal basalt-rhyolite volcanism and extensional faults dominate a stark and arid landscape. Near Lake Abert, the Late Miocene volcanic section abuts Early Miocene, dominantly intermediate composition volcanoes at the Coleman...
The Quartzburg District is seven miles north of Prairie City ineast-central Grant County, Oregon. The District is in a pre-Tertiarywindow of volcanic, plutonic, and sedimentary rocks ranging fromPermo-Triassic to Eocene-Oligocene in age. The Permo-TriassicDixie Butte volcanics consist of thick basalts and andesites with minorvolcanic breccias and intercalated argillite, chert, and...
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covered by flows of the Strawberry volcanics and the
Columbia River Group. Uplift of the Blue Mountains
Hydroacoustic tertiary (T-) waves are seismically generated acoustic waves that propagate
over great distances in the ocean sound channel with little loss in signal strength.
Hydrophone recorded T-waves can provide a lower earthquake detection threshold and an
improved epicenter location accuracy for oceanic earthquakes than land-based seismic
networks. Thus detection...
The Murderers Creek Area, within the Aldrich Mountain province of
northeast Oregon, originated in an arc-trench gap during Permian-early
Triassic time. The area represents a small portion of a forearc
depositional basin and tectonic highland which borders the basin along
its seaward margin. The trench associated with an east dipping...
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part from the melange and deposited in a forearc
basin formed by the uplift of the melange terrain; (3
There are seven stratigraphic units exposed in the Picture
Gorge quadrangle, a 204-square mile area in east-central Oregon.
isolated exposures of pre-Cretaceous serpentinites, metalimestones,
and other metamorphic rocks record marine deposition
of sands silts, and limy sediments followed by burial, lithification,
peridotite intrusion, and several periods of deformation. Intrusion
and...
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, lithifi-
cation, uplift, and erosion. Pebbles were derived from plutonic-
metamorphic highlands
This multidisciplinary study integrates remote sensing, stratigraphy, siliciclastic and carbonate sedimentology, tectonics, and petrography of the Nisai, Khojak and Sharankar Formations to reveal the Paleogene depositional, diagenetic and deformational history of the Katawaz Basin.
Study of Landsat Thematic Mapper (TM) digital data shows that maximum discrimination of different rocks is...
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lithics from bottom to top reflect gradual
uplift and unroofing of the early Himalaya. Diagenetic
Recently obtained airgun-sonobuoy wide-angle refraction and
reflection profiles provide data to study crustal velocities and
structures along the continental margin of northern California and
Southern Oregon.
In the thick sedimentary wedge at the base of the continental
slope, as many as five distinct layers can be seismically observed,
which range...
Two examples of Pacific rim plate boundary deformation are presented. In the first
part of the thesis crustal models are derived for the northwestern part of the Vizcaino
block in California using marine seismic and gravity data collected by the Mendocino
Triple Junction Seismic Experiment. A northwest-southeast trending kink in...
Six early to middle Tertiary geologic units crop out in the
Saddle and Humbug Mountain area. They include the late Eocene to
early Miocene Oswald West muds tones, the lower Silver Point and
the upper Silver Point tongues of the middle Miocene Astoria Formation,
and the middle Miocene Depoe Bay...
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tones
from the overlying lower Silver Point tongue and suggests that a
broad uplift occurred during an
Paleozoic limestones, dolomites, quartz arenites, and other
clastic rocks were mapped in the vicinity of Dobbin Summit and
Clear Creek in the central Monitor Range. Sedimentary rock units
present in this area represent the shallow-shelf eastern assemblage
and basin and also the basin-slope facies of the traditional limestoneclastic
assemblage.
The...
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eastern shelf carbonates.
The final episode of the Paleozoic evident in the area was uplift,
erosion
The oldest rocks of the Sturgill Peak area are herein named the
grassy slope phyllites, and are of Permian (?) age. They are
divided into a phyllitic member, consisting of complexly folded and
highly sheared phyllites and phyllitic cherts, and a limestone member,
containing sheared limestone, silicified limestone, and chert....
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, silver, and gold.
Uplift and erosion during Cretaceous and Tertiary time exposed
the intrusive complex
The central part of the Bayhorse Mining District is located in the Salmon River Mountains in north-central Idaho between the towns of Challis and Clayton. The area is underlain by metasedimentary rocks of Early to Middle Paleozoic age that were profoundly affected by the emplacement of a plutonic complex in...
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been partly exposed by post-Miocene uplift and
subsequent glacial and deep stream erosion.
The
