Conference Papers
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Mantle xenocrysts from the Masontown, Pennsylvania (USA) kimberlite: An ordinary mantle with Si-enriched spinels Mantle xenocrysts from the Masontown, Pennsylvania (USA) kimberlite: An ordinary mantle with Si-enriched spinels
No abstract available.
Authors
D.J. Schulze, B. Carter Hearn
What can we learn from the Wells, NV earthquake sequence about seismic hazard in the intermountain west? What can we learn from the Wells, NV earthquake sequence about seismic hazard in the intermountain west?
The February 21, 2008 Wells, NV earthquake (M 6) was felt throughout eastern Nevada, southern Idaho, and western Utah. The town of Wells sustained significant damage to unreinforced masonry buildings. The earthquake occurred in a region of low seismic hazard with little seismicity, low geodetic strain rates, and few mapped faults. The peak horizontal ground acceleration predicted by the...
Authors
M.D. Petersen, K.L. Pankow, G. P. Biasi, M. Meremonte
Seismic hazard mapping of California incorporating spatial variability of site conditions Seismic hazard mapping of California incorporating spatial variability of site conditions
The U.S. Geological Survey has recently released a 2008 version of the probabilistic National Seismic Hazard Maps. These maps plot the peak ground acceleration (PGA) and spectral acceleration (SA) ordinates at 0.2 and 1.0 sec with 2% and 10% probabilities of being exceeded in 50 years, corresponding to earthquake return periods of about 2,475 and 475 years, respectively. These...
Authors
Erol Kalkan, Chris J. Wills, David M. Branum
Status and needs for seismic instrumentation of structures along the Hayward fault Status and needs for seismic instrumentation of structures along the Hayward fault
The inventory of structures in heavily urbanized communities within the greater San Francisco (SF) Bay area that will experience strong ground motions from the rupture of the Hayward Fault includes a variety of types of recent and older structures built with a variety of materials and to different code standards. Those who remember the effects of the 1989 Loma Prieta earthquake on...
Authors
Erol Kalkan, Mehmet Çelebi
Toward implementation of a national ground water monitoring network Toward implementation of a national ground water monitoring network
The Federal Advisory Committee on Water Information's (ACWI) Subcommittee on Ground Water (SOGW) has been working steadily to develop and encourage implementation of a nationwide, long-term ground-water quantity and quality monitoring framework. Significant progress includes the planned submission this fall of a draft framework document to the full committee. The document will include
Authors
Robert P. Schreiber, William L. Cunningham, Rick Copeland, Kevin D. Frederick
WHE-PAGER Project: A new initiative in estimating global building inventory and its seismic vulnerability WHE-PAGER Project: A new initiative in estimating global building inventory and its seismic vulnerability
The U.S. Geological Survey’s Prompt Assessment of Global Earthquake’s Response (PAGER) Project and the Earthquake Engineering Research Institute’s World Housing Encyclopedia (WHE) are creating a global database of building stocks and their earthquake vulnerability. The WHE already represents a growing, community-developed public database of global housing and its detailed structural
Authors
K.A. Porter, K. S. Jaiswal, D.J. Wald, M. Greene, Craig Comartin
An integrated geophysical approach for groundwater and seismic hazard management in Joshua Tree National Park, southern California An integrated geophysical approach for groundwater and seismic hazard management in Joshua Tree National Park, southern California
Two‐dimensional inversion of audiomagnetotelluric (AMT) sounding data define buried resistivity distributions that reflect subsurface geology and structure within the upper kilometer beneath Pleasant Valley, a 1–2 km‐deep pull‐apart basin in Joshua Tree National Park, southern California. The Park lies within the Eastern California Shear Zone just east of the San Andreas Fault, and is...
Authors
Darcy McPhee, Victoria E. Langenheim, Bruce A. Chuchel, Louise Pellerin
Countability of sandhill cranes in aerial surveys Countability of sandhill cranes in aerial surveys
No abstract available.
Authors
Douglas H. Johnson, W John Solberg, Courtney L. Amundson
Status of greater sandhill cranes in the midcontinent population Status of greater sandhill cranes in the midcontinent population
No abstract available.
Authors
Gary L. Krapu, David A. Brandt
Land management in the Anthropocene: Is history still relevant? Land management in the Anthropocene: Is history still relevant?
Ecological restoration, conservation, and land management are often based on comparisons with reference sites or time periods, which are assumed to represent “natural” or “properly functioning” conditions. Such reference conditions can provide a vision of the conservation or management goal and a means to measure progress toward that vision. Although historical ecology has been used...
Authors
Hugh D. Safford, Julio L. Betancourt, Gregory D. Hayward, John A. Wiens, Claudia M. Regan
Reef communities in the Dry Tortugas (Florida, USA): Baseline surveys for the new no-take area Reef communities in the Dry Tortugas (Florida, USA): Baseline surveys for the new no-take area
To understand the current community structure on reefs in the Dry Tortugas, we conducted specieslevel surveys of macroalgae, coral diversity, herbivorous and game fishes, urchins, and substratum composition (e.g., rugosity) in shallow (3- to 5-m depth) low-relief reef and hardbottom habitats in October 2007. We had particular interest in the ecological process of herbivory inside and...
Authors
I. B. Kuffner, V. J. Paul, R. Ritson-Williams, T. D. Hickey, L. J. Walters