Publications
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Local variability but landscape stability in coral reef communities following repeated hurricane impacts
Coral reef community structure has remained remarkably stable over a 10 yr period within a small protected marine area despite repeated hurricane impacts. Local community dynamics have been highly variable, however. Sites that were destroyed by disease in the 1970s are showing little or no recovery, while sites less than a kilometre away that were devastated by Hurricane Hugo in 1989 are recoverin
Authors
John C. Bythell, Zandy M Hillis-Star, Caroline S. Rogers
Modern pollen deposition in Long Island Sound
Palynological analyses of 20 surface sediment samples collected from Long Island Sound show a pollen assemblage dominated by Carya, Betula, Pinus, Quercus, Tsuga, and Ambrosia, as is consistent with the regional vegetation. No trends in relative abundance of these pollen types occur either from west to east or associated with modern riverine inputs throughout the basin. Despite the large-scale, lo
Authors
Kristina R.M. Beuning, Lindsey Fransen, Berna Nakityo, Ellen L. Mecray, Marilyn R. Buchholtz ten Brink
Height changes in the epicentral region preceding the January 17, 1994 Northridge earthquake
Analysis of the results of repeated levelings through the epicentral region of the Mw 6.7, 1994 Northridge earthquake has disclosed the occurrence of differential uplift in this area that preceded the earthquake. Although the distribution of the relevant vertical-control data is somewhat sparse, in both space and time, those data that we have recovered indicate that this uplift exceeded 0.10 m and
Authors
Robert O. Castle, Robert F. Packard, Laura B. Dinitz
Invisible CO2 gas killing trees at Mammoth Mountain, California
Since 1980, scientists have monitored geologic unrest in Long Valley Caldera and at adjacent Mammoth Mountain, California. After a persistent swarm of earthquakes beneath Mammoth Mountain in 1989, geologists discovered that large volumes of carbon dioxide (CO2 ) gas were seeping from beneath this volcano. This gas is killing trees on the mountain and also can be a danger to people. The U.S. Geolog
Authors
Michael L. Sorey, Christopher D. Farrar, Terrance M. Gerlach, Kenneth A. McGee, William C. Evans, Elizabeth M. Colvard, David P. Hill, Roy A. Bailey, John D. Rogie, James W. Hendley, Peter H. Stauffer
Lunar Transient Phenomena: What do the Clementine Images Reveal?
Lunar Transient Phenomena (LTP) have been reported for at least 450 years. The events range from bright flashes, to reddish or bluish glows, to obscurations. Gaseous spectra and photometric measurements of the events have been obtained. Several theories have been offered as explanations for LTP, including residual volcanic activity or outgassing, bombardment by energetic particles, and piezoelectr
Authors
Bonnie J. Buratti, Timothy H. McConnochie, Sascha B. Calkins, John K. Hillier, Kenneth E. Herkenhoff
Recent planetary topographic mapping at the USGS, Flagstaff: Moon, Mars, Venus, and beyond
We are currently using stereophotogrammetric techniques to compile digital topographic models of parts of the Moon, Mars, Venus, and the asteroid Eros in support of the NASA program of planetary exploration. This work requires the synergistic use of the USGS digital cartographic software system ISIS for data ingestion and calibration steps, along with the commercial software SOCET SET for “photogr
Authors
Randolph L. Kirk, Elpitha Howington-Kraus, Mark R. Rosiek
Landslides in Alameda County, California: A digital database extracted from preliminary photointerpretation maps of surficial deposits by T.H. Nilsen in USGS Open-File Report 75-277
All or part of 25 7.5-minute quadrangles identifying 8465 landslides - largely slow-moving slides and earth flows - in Alameda County, California, have been converted to a digital-map database, compiled at 1:24,000 scale and plotted at 1:62,500 scale, that can be acquired from the U.S. Geological Survey over the Internet or on magnetic tape.
Authors
Sebastian Roberts, Michelle A. Roberts, Eileen M. Brennan
Digital elevation models derived from small format lunar images
No abstract available.
Authors
Mark R. Rosiek, Randolph L. Kirk, Elpitha Howington-Kraus
Results of the Galileo solid state imaging (SSI) experiment
We present a brief synopsis of the nature of SSI data that was taken during the nominal Galileo mission. Significant results are briefly described. These include evidence for geologic activity on Europa that supports the hypothesis of liquid water under a thin ice shell; a demonstration of the ubiquitous presence of a thick crust and high temperature silicate volcanism on Io; a demonstration that,
Authors
Michael J.S. Belton, C.D. Anger, M. H. Carr, C. R. Chapman, M. E. Davies, R. Greeley, R.J. Greenberg, J.W. Head, K.P. Klaasen, G. Neukum, C.B. Pilcher, P. C. Thomas, J. Veverka, P.J. Gierasch, A.P. Ingersoll, F. P. Fanale, Alfred S. McEwen, D. Morrison, G. Schubert, R.F. Beebe, J.A. Burns, T. V. Johnson, R.A. West, W. Ip, Michael McElroy, G.S. Orton
Living with a restless caldera: Long Valley, California
No abstract available
Authors
David P. Hill, Roy A. Bailey, Michael L. Sorey, James W. Hendley, Peter H. Stauffer
Peligros de deslizamientos [Landslide Hazards]
Deslizamientos, flujos de escombrera y desastres geológicos similares provenientes de volcanes ocurren alrededor del mundo. Cada año estos desastres causan billones de dólares en pérdidas y un sinnúmero de fatalidades y heridos. El primer paso para reducir los efectos dañinos causados por estos desastres es el conocimiento y educación acerca de ellos. El Servicio Geológico de los Estados Unidos se
Authors
Landslide Hazards
Landslide hazards occur in many places around What Can You Do If You Live Near Steep Hills? the world and include fast-moving debris flows, slow-moving landslides, and a variety of flows and slides initiating from volcanoes. Each year, these hazards cost billions of dollars and cause numerous fatalities and injuries. Awareness and education about these hazards is a first step toward reducing damag
Authors