Publications
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The geometric signature: Quantifying landslide-terrain types from digital elevation models The geometric signature: Quantifying landslide-terrain types from digital elevation models
Topography of various types and scales can be fingerprinted by computer analysis of altitude matrices (digital elevation models, or DEMs). The critical analytic tool is the geometric signature, a set of measures that describes topographic form well enough to distinguish among geomorphically disparate landscapes. Different surficial processes create topography with diagnostic forms that...
Authors
R.J. Pike
Large quaternary landslides in the central appalachian valley and ridge province near Petersburg, West Virginia Large quaternary landslides in the central appalachian valley and ridge province near Petersburg, West Virginia
Geological mapping and photointerpretation of side-looking airborne radar images and color-infrared aerial photographs reveal two large Quaternary landslides in the Valley and Ridge province of the central Appalachians near Petersburg, W. Va. The Elkhorn Mountain rock avalanche occurs on the thrust-faulted northwestern flank of the Elkhorn Mountain anticlinorium. A minimum of 7 × 106 m3...
Authors
C. Scott Southworth
Evidence for a new geomagnetic reversal from lava flows in Idaho: Discussion of short polarity reversals in the Brunhes and late Matuyama polarity chrons Evidence for a new geomagnetic reversal from lava flows in Idaho: Discussion of short polarity reversals in the Brunhes and late Matuyama polarity chrons
K-Ar ages and paleomagnetic data for basalt samples from a new core hole (site E) at the Idaho National Engineering Laboratory (INEL) indicate that the age of the reversed polarity event recorded in Snake River Plain lavas is older than 465±50 ka (1000 years before present) reported previously by Champion et al. (1981). Nine basalt flows, eight with normal polarity and one with reversed...
Authors
D.E. Champion, M. A. Lanphere, M. A. Kuntz
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, June 1988 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, June 1988
No abstract available.
Authors
John B. Townshend, R. V. O’Connell, L.Y. Torrence
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1988 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1988
No abstract available.
Authors
John B. Townshend, R. V. O’Connell, L.Y. Torrence
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, February 1988 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, February 1988
No abstract available.
Authors
John B. Townshend, R. V. O’Connell, L.Y. Torrence
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, October 1988 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, October 1988
No abstract available.
Authors
John B. Townshend, R. V. O’Connell, L.Y. Torrence
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1988 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1988
No abstract available.
Authors
John B. Townshend, R. V. O’Connell, L.Y. Torrence
Carbonate to siliciclastic periplatform sediments: southwest Florida Carbonate to siliciclastic periplatform sediments: southwest Florida
Three distinct carbonate deposits have been identified on the slope and adjacent sea floor of the southwestern Florida Platform: (1) reef talus, recognized by shape and location, found on the upper slope of the Yucatan Channel and also east of the Marquesas Keys; (2) hemipelagic sediments, with complex sigmoid-oblique bed forms, filling the intervening gap between the channel and Keys...
Authors
Charles W. Holmes
Causes of two slope-failure types in continental-shelf sediment, northeastern Gulf of Alaska Causes of two slope-failure types in continental-shelf sediment, northeastern Gulf of Alaska
Slumps and sediment-gravity flows have been identified in Holocene glaciomarine sediment on declivities less than 1.3 degrees on the Gulf of Alaska continental shelf. Geologic and geotechnical investigation suggest that the processes responsible for these slope failures are earthquake and storm-wave loading, coupled with cyclic degradation of the sediment-shear strength. We propose that...
Authors
William C. Schwab, Homa J. Lee
Crustal structure of east central Oregon: Relation between Newberry Volcano and regional crustal structure Crustal structure of east central Oregon: Relation between Newberry Volcano and regional crustal structure
A 180-km-long seismic refraction transect from the eastern High Cascades, across Newberry Volcano, to the eastern High Lava Plains is used to investigate the subvolcanic crustal and upper mantle velocity structure there. Near-surface volcanic flows and sedimentary debris (1.6-4.7 km/s), ranging from 3 to 5 km in thickness, overlie subvolcanic Basin and Range structures. East and west of...
Authors
R. D. Catchings, Walter D. Mooney