Publications
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Spatial and temporal deformation along the northern San Jacinto fault, southern California: Implications for slip rates
The San Timoteo badlands is an area of uplift and erosional dissection that has formed as a result of late Quaternary uplift along a restraining bend in the San Jacinto fault, of the San Andreas fault system in southern California. This bend currently is located in a region where late Quaternary deposits and associated surfaces have formed in lower San Timoteo Canyon. We have used morphometric ana
Authors
K.J. Kendrick, D. M. Morton, S. G. Wells, R. W. Simpson
Geomorphic studies of landslides in the Tully Valley, New York: Implications for public policy and planning
On April 27, 1993, a large landslide in the Tully Valley, Onondaga County, NY, destroyed three houses and resulted in the evacuation of four others; it also triggered a loss of potable drinking water for about 15 homes north of the slide area and affected a total of 20 ha of land. In the 7 years following this slide, several studies have been conducted by federal and state environmental agencies a
Authors
D. L. Pair, W. M. Kappel
High-resolution image of Calaveras Fault seismicity
By measuring relative earthquake arrival times using waveform cross correlation and locating earthquakes using the double difference technique, we are able to reduce hypocentral errors by 1 to 2 orders of magnitude over routine locations for nearly 8000 events along a 35-km section of the Calaveras Fault. This represents ∼92% of all seismicity since 1984 and includes the rupture zone of the M 6.2
Authors
D. P. Schaff, G. H. R. Bokelmann, G. C. Beroza, Felix Waldhause, William L. Ellsworth
Comparing landslide inventories: The map depends on the method
Landslide inventory maps are generally prepared by interpreting the geomorphic expression of landsliding on aerial photos, topographic maps, or on the ground. Distinctive landslide geomorphology allows the recognition and mapping of landslides, although there are always landslides that have very subtle expression and are not identified. The difficulties of mapping landslides based on their geomorp
Authors
C.J. Wills, T.P. McCrink
Remotely sensed geology from lander-based to orbital perspectives: Results of FIDO rover May 2000 field tests
Blind field tests of the Field Integration Design and Operations (FIDO) prototype Mars rover were carried out 7-16 May 2000. A Core Operations Team (COT), sequestered at the Jet Propulsion Laboratory without knowledge of test site location, prepared command sequences and interpreted data acquired by the rover. Instrument sensors included a stereo panoramic camera, navigational and hazard-avoidance
Authors
B. Jolliff, A. Knoll, R.V. Morris, J. Moersch, H. McSween, M. Gilmore, R. Arvidson, R. Greeley, Kenneth E. Herkenhoff, S. Squyres
Revised ages for tuffs of the Yellowstone Plateau volcanic field: Assignment of the Huckleberry Ridge Tuff to a new geomagnetic polarity event
40Ar/39Ar ages were determined on the three major ash-flow tuffs of the Yellowstone Plateau volcanic field in the region of Yellowstone National Park in order to improve the precision of previously determined ages. Total-fusion and incremental- heating ages of sanidine yielded the following mean ages: Huckleberry Ridge Tuff—2.059 ± 0.004 Ma; Mesa Falls Tuff— 1.285 ± 0.004 Ma; and Lava Creek Tuff—
Authors
M. A. Lanphere, D. E. Champion, R. L. Christiansen, G. A. Izett, J.D. Obradovich
Shallow seismic imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, California
High-resolution seismic reflection profiles image discrete folds in the shallow subsurface (<600 m) above two segments of the Puente Hills blind-thrust fault system, Los Angeles basin, California. The profiles demonstrate late Quaternary activity at the fault tip, precisely locate the axial surfaces of folds within the upper 100 m, and constrain the geometry and kinematics of recent folding. The S
Authors
Thomas L. Pratt, John H. Shaw, James F. Dolan, Shari A. Christofferson, Robert Williams, Jack K. Odum, Andreas Plesch
Processes of lithosphere evolution: New evidence on the structure of the continental crust and uppermost mantle
We discuss the structure of the continental lithosphere, its physical properties, and the mechanisms that formed and modified it since the early Archean. The structure of the upper mantle and the crust is derived primarily from global and regional seismic tomography studies of Eurasia and from global and regional data on seismic anisotropy. These data as documented in the papers of this special is
Authors
I.M. Artemieva, Walter D. Mooney, E. Perchuc, H. Thybo
Seismic evidence for a mantle source for mid-Proterozoic anorthosites and implications for models of crustal growth
Voluminous anorthosite intrusions are common in mid-Proterozoic crust. Historically, two end-member models have been proposed for the origin of these anorthosites. In the first model anorthosites derive from fractionation of a mantle source leaving a residue of metagabbro in the lower crust; in the second model anorthosites are the product of partial melting of the lower crust with residual pyroxe
Authors
G. Musacchio, Walter D. Mooney
Study on 3-D velocity structure of crust and upper mantle in Sichuan-yunnan region, China
Based on the first arrival P and S data of 4 625 regional earthquakes recorded at 174 stations dispersed in the Yunnan and Sichuan Provinces, the 3-D velocity structure of crust and upper mantle in the region is determined, incorporating with previous deep geophysical data. In the upper crust, a positive anomaly velocity zone exists in the Sichuan basin, whereas a negative anomaly velocity zone ex
Authors
C. Wang, Walter D. Mooney, X. Wang, J. Wu, H. Lou, F. Wang
Seismic structure of the crust and uppermost mantle of North America and adjacent oceanic basins: A synthesis
We present a new set of contour maps of the seismic structure of North America and the surrounding ocean basins. These maps include the crustal thickness, whole-crustal average P-wave and S-wave velocity, and seismic velocity of the uppermost mantle, that is, Pn and Sn. We found the following: (1) The average thickness of the crust under North America is 36.7 km (standard deviation [s.d.] ±8.4 km)
Authors
G.S. Chulick, Walter D. Mooney
Global significance of a sub-Moho boundary layer (SMBL) deduced from high-resolution seismic observations
We infer the fine structure of a sub-Moho boundary layer (SMBL) at the top of the lithospheric mantle from high-resolution seismic observations of Peaceful Nuclear Explosions (PNE) on superlong-range profiles in Russia. Densely recorded seismograms permit recognition of previously unknown features of teleseismic propagation of the well known Pn and Sn phases, such as a band of incoherent, scattere
Authors
K. Fuchs, M. Tittgemeyer, T. Ryberg, F. Wenzel, Walter D. Mooney