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Recently Published Articles

Brock, J., Sallenger, A.H., Dravill, W., Swift, R., Serdar, M., Meredity, A., Jansen, M., and Eslinger, D., 1999, Aircraft laser altimetry for coastal process studies: Coastal Sediments '99, v. 3, p. 2414-2428.

Carlson, P.R., Cochrane, G.R., Hooge, P.N., and Taggert, S.J., 1999, Discovery of 100+ yr old iceberg gouges; Are they effective habitats for halibut in lower Glacier Bay, Alaska?: Geological Society of America, Abstracts with Program, v. 31, no. 6, p. 43.

Haines, J.W., Howd, P., and Hanson, K., 1999, Cross-shore transport and profile evolution at Duck, North Carolina: Coastal Sediments '99, v. 2, p. 1050-1064.

Hapke, C.J. and Richmond, B.M., 1999, The development of a coastal aerial mapping system (CAMS) and its application to the study of coastal morphodynamics: Coastal Sediments '99, v. 3, p. 2398-2413.

  • This paper describes the design specifications and flight-planning techniques for the newly developed Coastal Aerial Mapping System (CAMS).
  • CAMS data have been collected and processed using softcopy photogrammetry in three coastal areas to date: Duck, NC, Kailua Bay, Oahu, HI, and Santa Cruz, CA.
  • CAMS is shown to provide good spatial coverage of the coast, it can be used to collect data both time and cost efficiently, and it can mobilize rapidly in the case of a severe event.

Johnson, S.Y., Dadisman, S.V., Childs, J.R., and Stanley, W.D., 1999, Active tectonics of the Seattle fault and central Puget Sound, Washington—Implications for earthquake hazards: Geological Society of America Bulletin, vol.111, no. 7, p. 1042-1053.

An extensive network of marine, high-resolution and conventional industry, seismic-reflection data and onshore field observations was used to constrain the location, shallow structure, and displacement rates of the Seattle fault zone and crosscutting, high-angle faults in the Puget Lowland of western Washington.

Results show that:

  • The Seattle fault forms a broad 4- to 6-km-wide, west-trending zone of three or more south-dipping reverse faults which can be mapped for at least 40 km from Dyes Inlet to Lake Washington.

  • Quaternary sediments have been folded and faulted along all faults within the zone and a Quaternary slip rate of 0.7-1.1 mm/yr for the entire Seattle fault system is estimated.

  • An active, north-trending, high-angle, strike-slip fault zone with 2.4 km of cumulative dextral displacement cuts the Seattle fault into two main segments.

  • The north-trending fault zone truncates and warps reflections of Tertiary and Quaternary strata and has a minimum cumulative slip rate of about 0.2-0.3 mm/yr.

  • Based on relations between rupture length and moment magnitude, earthquakes of M 6.5 are possible on this north-trending, strike-slip fault zone.

Implications for earthquake hazards are:

  • Segmentation of the Seattle fault could limit the area ruptured in some earthquakes; however, a large event ca. AD 900 appears to have involved both segments.

  • Regional seismic-hazard assessments must incorporate new information on fault length, geometry, and displacement rates on the Seattle fault.

  • The hazard posed by the previously unrecognized, north-trending, strike-slip fault zone must also be considered in future local and regional earthquake hazard assessments.

Marlow, M.S., Jachens, R.C., Hart, P.E., Carlson, P.R., Anima, R.J., and Childs, J.R., 1999, Development of San Leandro synform and neotectonics of the San Francisco Bay block, California: Marine and Petroleum Geology, v. 16, p. 431-442.

Sallenger, A., Howd, P., Brock, J., Krabill, W., Swift, R., and Manizade, S., 1999, Scaling winter storm impacts on Assateague Islands, MD, VA: Coastal Sediments '99, v. 3, p. 1814-1825.

Sallenger, A.S., Jr., Krabill, W., Brock, J., Swift, R., Jansen, M., Manizade, S., Richmond, B., Hampton, M., and Eslinger, D., 1999, Airborne laser study quantifies El Nio-induced coastal changes: EOS, Transactions of the American Geophysical Union, v. 80, no 8, p. 89, 92-93.

Stumpf, R.P., Morgan, K.L.M., Peterson, R., Krohn, M.D., and Sallenger, A.H., 1999, Mapping impacts of Hurricanes Fran and Bertha on North Carolina dunes: Coastal Sediments '99, v. 3, p. 1826-1835.

ten Brink, U., Dillon, W., Frankel, A., Mueller, C., and Rodriguez, R., 1999, Seismic and Tsunami Hazard in Puerto Rico and the Virgin Islands: U.S. Geological Survey (Electronic) Open-file Report 99-353.

Puerto Rico and the Virgin Islands are located at an active plate boundary between the North American plate and NE corner of the Caribbean plate. The region has been subject in historical times to large-magnitude earthquakes and devastating tsunamis. A major downward tilt of the sea floor north of these islands, large submarine rockslides, and an unusually large negative-gravity anomaly are also indicative of a tectonically active region. Scientists have so far failed to explain the deformation of this region in a coherent and predictable picture, such as in California, thus hampering their ability to assess seismic and tsunami hazards in the region. The NE corner of the Caribbean is unique among the seismically active regions of the U.S. in that it is mostly covered by water. This fact presents an additional challenge for seismic and tsunami hazard assessment and mitigation.

The Seismic and Tsunami Hazard in Puerto Rico and the Virgin Islands Workshop convened in San Juan on March 23-24, 1999, and was "historic" in that it brought together for the first time a broad spectrum of scientists, engineers, and public and private sector officials. The participants deal with such diverse questions as tectonic models, probabilistic assessment of seismic hazard, prediction of tsunami run-up, strong ground motion, building codes, stability of man-made structures, and the public's preparedness for natural disasters. It was an opportunity for the participants to find out how their own activity fit into the broad picture of science and how science aids society in hazard assessment and mitigation. In addition, the workshop was offered as a continuing education course at the Colegio de Ingenieros y Agrimensores de Puerto Rico, which assured a rapid dissemination of the results to the local community. A news conference that took place during the workshop alerted the public to the efforts of the USGS, other Federal agencies, the Commonwealth of Puerto Rico, universities, and the private sector.

Wong, F.L., Carlson, P.R., and Chin, J.L., 1999, Historic man-made changes to the floor of west-central San Francisco Bay: Geological Society of America, Abstracts with Program, v. 31, no. 6, p. 109.

Publications Sent to Geologic Division Publications Groups

  • Baucom, P.C., and Colman, S.M., A continuous Holocene transgressive sequence recorded in an 8-m core taken from northern Chesapeake Bay (abs.): Geological Society of America, Annual Meeting, October 25-28, 1999, Denver, CO.

  • Bothner, M.H., Butman, B., Buchholtz ten Brink, M., Knebel, H.J., Manheim, F.T., and Signell, R.P., USGS addressing science and management questions in Boston Harbor and Massachusetts Bay (abs.): Geological Society of America, Annual Meeting, October 25-28, 1999, Denver, CO.

  • Bratton, J.F., Colman, S.M., and Ravizza, G., Sedimentary rhenium enrichment and hypoxia in Chesapeake Bay (abs.): Geological Society of America, Annual Meeting, Denver, CO, October 25-28, 1999.

  • Denny, J.F., and Schwab, W.C., Archive of sidescan-sonar data and DGPS navigation data collected during USGS cruise SEAX95007, 8 May -24 May, 1995: U.S. Geological Survey Open-File Report 99-356, CD-ROM.

  • Gardner, J.V., Dartnell, P., Gibbons, H., MacMillan, D., Exposing the seafloor: High-resolution multibeam mapping along the U.S. Pacific coast: U.S. Geological Survey Fact Sheet.

  • Hickey, D.T., and Shinn, E.A., Stalactite diagenesis within an inland blue hole: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Kindinger, J.L., Davis, J.B., and Flocks, J.G., Evolution of sinkhole lakes in North-Central Florida: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Manheim, F.T., Flocks, J.G., and Hayes, L., Geochemical database and environmental analysis of bottom sediments from the Lake Ponchartrain Basin, southeastern Louisiana: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Marlow, M.S., Bohannon, R.G., Gardner, J.V., Normark, W.R., and Simpson, R.W., Jr., Palos Verdes fault complex: An example of fault segmentation in offshore Southern California (abs.): Geological Society of America, Annual Meeting, Oct. 1999, Denver, CO.

  • Parsons, T., and Hart, P.E., Special report: Converging dips of the San Andreas and Hayward faults revealed beneath San Francisco Bay, California: Geology.

  • Poag, C.W., Depositional regimes during emplacement of the Exmore breccia (Chesapeake Bay impact crater): clues from downhole geophysical logs (abs.): Geological Society of America Annual Meeting, Denver, CO, October 25-28, 1999.

  • Poppe, L.J., Knebel, H.J., Haase, E.J., and Parolski, K.F., Sidescan imagery and surficial geologic interpretation of the Long Island Sound sea floor in New Haven Harbor, Connecticut (abs.): Geologic Society of America, National Meeting, Denver, CO, October 25-28, 1999.

  • Ravizza, G., Tuit, C.B., and Bothner, M.H., Os isotopes as tracers of sewage dispersal in the marine environment (abs.): Annual Meeting of the Geochemistry Society, Goldschmidt Conference, August 1999.

  • Reich, C., Swarzenski, P., Kindinger, J., Flocks, J., Hickey, D., and Spechler, R., Direct linkages between onshore karst aquifers and offshore marine environments: Crescent Beach Spring, Florida: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Robbins, L., Brock, J., Halley, R., Kindinger, J., Sallenger, A., and Tao, Y., Satellite and airborne sensors for coastal science in the USGS: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Ryan, H., and Noble, M., El Nio related forcing of sea level and temperature along the central California coast in 1997 and early 1998: Journal of Geophysical Research.

  • Sallenger, A.H., Jr., List, J., Penland, S., and Dingler, J., Catastrophic storm impacts of the 'inundation' regime: Hurricane Camille 30th Anniversary Symposium.

  • Sallenger, A.H., Jr., Scaling the impact of storms on barrier islands: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Shinn, E.A. Garrison, V., Smith, G., and Weir, J., Environmental research and speculations from space: GSA Annual Meeting, Oct. 1999, Denver, CO.

  • Shinn, E.A., and Reich, C.D., Trace element distribution in Florida Bay: Atmospheric or hydrologic deposition? Florida Bay Conference, Nov. 1999, Key Largo, Fla.

  • Swarzenski, P., Kindinger, J., Reich, C., Hickey, D., and Spechler, R., Re-examining the hydrogeochemistry of Crescent Beach Spring, Florida (abs.): GSA Annual Meeting, Oct. 1999, Denver, CO.

  • ten Brink, U., Dillon, W.P., Frankel, A., Mueller, C., and Rodriguez, R., Seismic and tsunami hazard in Puerto Rico and the Virgin Islands: U.S. Geological Survey Open-File Report, electronic, URL:

  • Thieler, E.R., and Marth, N.J., A U.S. national assessment of future coastal conditions due to sea-level rise (abs.): Geological Society of America, Annual Meeting, Special Session T30, Coastal Geologic Risk, Denver, CO, October 25-28, 1999.

  • Valentine, P., Barr, B., Collie, J., Auster, P., and Butman, B., Biology and geology in the coastal ocean: examples from offshore northeastern United States (abs.): Geological Society of America, Annual Meeting, October 25-28, 1999, Denver, CO.

  • Yates, K., and Halley, R., Geochemical measurements of carbonate sedimentation and organic productivity in Florida Bay: A potential measure of restoration progress: 1999 Florida Bay Science Conference, Nov. 1999, Key Largo, Fla.

  • Yates, K.K., Robbins, L.L., and Michael, J., Air:sea CO2 gas fluxes and geochemistry of marine whitings: GSA Annual Meeting, Oct. 1999, Denver, CO.

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