A series of hydrothermal (high-temperature and -pressure) phase equilibrium experiments were performed on a natural rhyodacite pumice from the 1,050 calibrated years B.P. pyroclastic flow from the Chaos Crags, Lassen Volcanic Center, California. The p . . .

The tectonic and climatic history of the Cache Creek watershed has been recorded by fluvial strath terraces from the late Pleistocene to the present. A total of nine terrace elevations at Wilson Valley and nine terrace elevations at Buck Island were m . . .

The Caspar Creek watershed, in coastal Northern California, features many gullies in its tributary valleys that deliver sediment directly into the perennial channel network. These gullies may help explain rates of sediment delivery in the watershed. S . . .

Associated with the northern strands of the San Andreas fault system in California is a series of small intermontane basins. While it is tempting to ascribe their formation to simple ‘pull-apart’ tectonics along the dominantly strike-slip fault strand . . .

Diatoms preserved in sand layers deposited in a coastal freshwater pond in Del Norte County, California, record repeated inundation by tsunamis. The pond deposits at Lagoon Creek contain primarily peat interbedded with landward-thinning and landward-f . . .

A paleosol developed on the Mesozoic Franciscan Complex is depositionally overlain by 48 m of late Miocene (diatom age ca. 6.0-6.4 Ma), mostly shallow-marine Saint George Formation. At the base of this sequence is a buried paleoforest of rooted tree s . . .

Initial mapping of the Mad River fault zone (MRFZ) was at a scale of 1:24,000, over several years and at a reconnaissance level with limited access to land for field verification. My study area is within the MRFZ, approximately 15 km northeast of the . . .

LiDAR mapping reveals a prominent, 4 km long, south-side up fault scarp that occurs along trend and within 500 m of the Boulder Creek fault in the North Fork Nooksack River valley. Thrust faulting of Late Pleistocene glacial outwash over Holocene soil . . .

Forming at sea level, uplifted shore platforms serve as long-term geodetic markers. The spatial distribution and elevation of marine terrace sequences offer insight to regional tectonics. In the Trinidad coastal area, active tectonic processes reflect . . .

I investigate evidence of coseismic subsidence in southern Humboldt Bay and the relation of this subsidence to Cascadia subduction zone earthquakes and to earthquakes on the Little Salmon fault, an active upper plate thrust fault that borders Humboldt . . .

Analysis of aerial photographs following the January 1997 storm in the Redwood Creek basin, north coastal California, documented 250 fresh landslides greater than 400 m2 in area. Data on failure type, hillslope position, hillslope form, hillslope grad . . .

Study of late Pleistocene sediments near the mouth of the Mad River revealed a sequence of nearshore marine and shallow bay deposits. This sequence, bounded by unconformities, is informally named the Mouth of Mad unit. The Mouth of Mad unit can be div . . .

Interferometry synthetic aperture radar (InSAR) was used to detect the precursor movement of the East Branch of East Weaver Creek landslide four years prior to the significant failure in 2011. By using measurements calculated from the InSAR imagery an . . .

Mapping of landforms and Quaternary stratigraphy within Newark Valley, east-central Nevada, has resulted in the characterization of shorelines used for paleoclimatic interpretations in pluvial Lake Newark. Shorelines are differentiated into two age gr . . .

The southern Cascadia subduction zone (CSZ) of northwestern California exhibits northeast-directed contraction, transitioning to north-northwest directed translation within the broad San Andreas fault (SAF) transform margin to the south. The Little Sa . . .

Late Holocene stratigraphy representing rapid episodic subsidence is found in synclines of Humboldt Bay, California. These synclines are associated with the Cascadia subduction zone fold and thrust belt, which bends eastward in Northern California. In . . .

This thesis investigates currents produced by recent tsunamis in Humboldt Bay and Crescent City, California. The region is susceptible to both near- and far-field tsunamis and has a historic record of damaging events. Crescent City Harbor, 100 km nort . . .

The Cascadia subduction zone (CSZ) in the Pacific Northwest, where the Gorda plate is subducting beneath the North American plate, may be capable of producing M 9 earthquakes. At its southern end, the CSZ terminates at the Mendocino triple junction in . . .

During Pleistocene pluvial periods, Lake Madeline occupied an isolated, internally drained volcanic plateau comprised of three contiguous subbasins: Grasshopper Valley, Dry Valley, and the Madeline Plains in northeastern California. The geomorphic exp . . .

Sixty-one normal faults were identified in a 53-kilometer long by 21-kilometer wide northwest-trending zone in central and northern Deschutes County, Oregon. The faults are within the Tumalo and Sisters fault zones and the Northwest Rift Zone, and ext . . .

Evaluating the geomorphic evolution of surface processes along the Manastash Ridge and range front provided insight into the structural growth and evolution of the Manastash anticline, Yakima Fold Belt, Washington. Based on multiple independent data s . . .

The hydrologic behavior of the unsaturated zone of a forested colluvium-mantled hollow is examined using an array of 11 tensiometers and 3 groundwater wells to record the response to rainfall events during the 1987-88 winter. Erratic tensiometer respo . . .

Active faulting has been documented along the northwest-striking Mohawk Valley fault zone (2-3 normal-dextral rupture events in the Holocene with geologic slip rates of ~0.2mm/yr) and in the Lake Tahoe basin (mostly on north-striking normal faults wit . . .

Geologic mapping of the Grey Rocks Ridge area identified three klippes of Devonian Copley Greenstone separated from the underlying Trinity terrane by an undulating extensional fault and preserved by oblique down-dropping on NW-NE striking faults. The . . .

Clearcutting is a common timber harvest method in the Sequoia National Forest. Clearcuts are managed to minimize the amount of erosion off of hillslopes, but the timber harvesting practices invariably lead to erosion which would not have occurred if t . . .

Strath terrace and knickpoint formation along mainstem channels are indicators of landscape response to tectonic and climatic forcing in the Smith River watershed in northwestern California. Knickpoints in the Smith River basin are manifest as a disti . . .

Multiple knickpoints are present in two tributary basins of the South Fork Eel River. These tributaries are downstream from a major knickpoint on the South Fork Eel River, which may be a transient knickpoint propagating base-level fall throughout the . . .

Brittle deformation of young unconsolidated sediments related to recent faulting events is not well understood. Deformation bands in Late Holocene fluvial sands overlying the active trace of the San Andreas Fault (SAF) were studied to examine the rela . . .

The Mattole River, in northwestern California, is located in a tectonically active and geologically complex area, the Mendocino Triple Junction (MTJ), where the North American, Pacific and Gorda plates meet. The Mattole River does not follow the class . . .

Since rehabilitation of deforested watersheds has begun in the Pacific Northwest, published large scale evaluations of road removal and respective erosion control techniques have been brief and scarce. In 1997, a 12 year recurrence interval storm prov . . .

Paleoseismic investigation to identify late Holocene upper crustal movement beneath Arcata Bay has confirmed four buried marsh soils that represent three, possibly four, great southern Cascadia subduction zone earthquakes. Estimated ages of earthquake . . .

Streambed scour and fill affecting incubation survival of salmon embryos were investigated in a Northern California coastal stream (Freshwater Creek) for coho (Oncorhynchus kisutch) and chinook (Oncorhynchus tshawytscha) species. Objectives of the stu . . .