Publications
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Geologic and bathymetric reconnaissance overview of the San Pedro shelf region, southern California Geologic and bathymetric reconnaissance overview of the San Pedro shelf region, southern California
This report presents a series of maps that describe the bathymetry and late Quaternary geology of the San Pedro shelf area as interpreted from seismic-reflection profiles and 3.5-kHz and multibeam bathymetric data. Some of the seismic-reflection profiles were collected with Uniboom and 120-kJ sparker during surveys conducted by the U.S. Geological Survey (USGS) in 1973 (K-2-73-SC), 1978...
Authors
Stephen C. Wolf, Christina E. Gutmacher
Northwestern panhandle of Florida coastal classification maps— St. Andrew Bay entrance channel to Perdido Pass Northwestern panhandle of Florida coastal classification maps— St. Andrew Bay entrance channel to Perdido Pass
No abstract available.
Authors
Robert A. Morton, Russell L. Peterson, Tara L. Miller
The Catfish Lake Scarp, Allyn, Washington: Preliminary field data and implications for earthquake hazards posed by the Tacoma fault The Catfish Lake Scarp, Allyn, Washington: Preliminary field data and implications for earthquake hazards posed by the Tacoma fault
The Tacoma fault bounds gravity and aeromagnetic anomalies for 50 km across central Puget lowland from Tacoma to western Kitsap County. Tomography implies at least 6 km of post-Eocene uplift to the north of the fault relative to basinal sedimentary rocks to the south. Coastlines north of the Tacoma fault rose about 1100 years ago during a large earthquake. Abrupt uplift up to several...
Authors
Brian L. Sherrod, Alan R. Nelson, Harvey M. Kelsey, Thomas M. Brocher, Richard J. Blakely, Craig S. Weaver, Nancy K. Rountree, B. Susan Rhea, Bernard S. Jackson
Geology of the Ugashik-Mount Peulik Volcanic Center, Alaska Geology of the Ugashik-Mount Peulik Volcanic Center, Alaska
The Ugashik-Mount Peulik volcanic center, 550 km southwest of Anchorage on the Alaska Peninsula, consists of the late Quaternary 5-km-wide Ugashik caldera and the stratovolcano Mount Peulik built on the north flank of Ugashik. The center has been the site of explosive volcanism including a caldera-forming eruption and post-caldera dome-destructive activity. Mount Peulik has been formed...
Authors
Thomas P. Miller
Sidescan sonar imagery and surficial geologic interpretation of the sea floor off Branford, Connecticut Sidescan sonar imagery and surficial geologic interpretation of the sea floor off Branford, Connecticut
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Connecticut Department of Environmental Protection (CT DEP), Figure 1 - Map of Study Areahas produced detailed geologic maps of the sea floor in Long Island Sound, a major East Coast estuary surrounded by the most densely populated region of the United States. These...
Authors
L.J. Poppe, V.F. Paskevich, M. S. Moser, M. L. DiGiacomo-Cohen, E. B. Christman
The emplacement of pahoehoe toes: Field observations and comparison to laboratory simulations The emplacement of pahoehoe toes: Field observations and comparison to laboratory simulations
We observed active pahoehoe lobes erupted on Kilauea during May-June 1996, and found a range of emplacement styles associated with variations in local effusion rate, flow velocity, and strain rate. These emplacement styles were documented and quantified for comparison with earlier laboratory experiments. At the lowest effusion rates, velocities, and strain rates, smooth-surfaced lobes...
Authors
Tracy K. P. Gregg, Laszlo P. Keszthelyi
Io after Galileo Io after Galileo
No abstract available.
Authors
Elizabeth P. Turtle, Laszlo P. Keszthelyi, David A. Williams
Chemical analyses of tertiary volcanic rocks, central San Juan caldera complex, southwestern Colorado Chemical analyses of tertiary volcanic rocks, central San Juan caldera complex, southwestern Colorado
In conjunction with integrated mapping of the Oligocene central San Juan caldera cluster, southwestern Colorado (USGS I-Map 2799, in press), all modern chemical analyses of volcanic rocks for this area determined in laboratories of the U.S. Geological Survey have been re-evaluated in terms of the stratigraphic sequence as presently understood. These include approximately 700 unpublished...
Authors
Peter W. Lipman
Compilation of Post Wildfire Runoff-Event Data from the Western United States Compilation of Post Wildfire Runoff-Event Data from the Western United States
No abstract available.
Authors
Joseph E. Gartner, Erica R. Bigio, Susan H. Cannon
The Cottage Lake aeromagnetic lineament: A possible onshore extension of the southern Whidbey Island fault, Washington The Cottage Lake aeromagnetic lineament: A possible onshore extension of the southern Whidbey Island fault, Washington
The northwest-striking southern Whidbey Island fault zone (SWIF) was mapped previously using borehole data and potential-field anomalies on Whidbey Island and marine seismic surveys beneath surrounding waterways. Abrupt subsidence at a coastal marsh on south-central Whidbey Island suggests that the SWIF experienced a MW 6.5 to 7.0 earthquake about 3000 years ago. Southeast of Whidbey...
Authors
Richard J. Blakely, Brian L. Sherrod, Ray E. Wells, Craig S. Weaver, David H. McCormack, Kathy G. Troost, Ralph A. Haugerud
Interpretation of the Seattle Uplift, Washington, as a passive-roof duplex Interpretation of the Seattle Uplift, Washington, as a passive-roof duplex
We interpret seismic lines and a wide variety of other geological and geophysical data to suggest that the Seattle uplift is a passive-roof duplex. A passive-roof duplex is bounded top and bottom by thrust faults with opposite senses of vergence that form a triangle zone at the leading edge of the advancing thrust sheet. In passive-roof duplexes the roof thrust slips only when the floor...
Authors
Thomas M. Brocher, Richard J. Blakely, Ray E. Wells
Mars: Water, water everywhere Mars: Water, water everywhere
Mars is a very watery planet, but all the water seems to be frozen. Divining the amount and distribution of this water, past and present, is essential for understanding martian climates, and more.
Authors
Timothy N. Titus