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Sacramento, CA, United States

Yparraguirre D.R.,416 9th Street | Hunt E.G.,405 Wyman Drive | Connelly D.P.,Tall United | Weaver M.L.,Wildlife Branch
California Fish and Game | Year: 2014

In this invited paper we summarize some of the scientific work produced to inform waterfowl management in California and the Pacific Flyway, with an emphasis on those contributions by Department of Fish and Wildlife (Department) waterfowl biologists assigned to Federal Aid in Wildlife Restoration Project W30R and chronicled in California Fish and Game. Investigations carried out by other Pittman-Robertson projects also contributed substantially to the Department's science-based programs for waterfowl, particularly regarding waterfowl disease and food habits investigations. Important information needs, addressed by the best scientific methods of the day, included population abundance and trend, breeding and wintering distributions, critical habitat needs, vital rates (survival, recruitment), the establishment of appropriate hunting regulations, and how problems identified could best be addressed to maintain the abundance and distribution of waterfowl for future generations. © 2014 California Fish and Game. Source


Lienkaemper J.J.,U.S. Geological Survey | Barry G.R.,416 9th Street | Smith F.E.,416 9th Street | Mello J.D.,416 9th Street | McFarland F.S.,San Francisco State University
Bulletin of the Seismological Society of America | Year: 2013

Once assumed to be locked, we show that the northern third of the Greenville fault (GF) creeps at 2 mm=yr, based on 47 yr of trilateration net data. This northern GF creep rate equals its 11 ka slip rate, suggesting a low strain accumulation rate. In 1980, the GF, easternmost strand of the San Andreas fault system east of San Francisco Bay, produced an Mw 5.8 earthquake with a 6 km surface rupture and dextral slip growing to ≥ 2 cm on cracks over a few weeks. Trilateration shows a 10 cm post-1980 transient slip ending in 1984. Analysis of 2000-2012 crustal velocities on continuous Global Positioning System stations, allows creep rates of ~2 mm=yr on the northern GF, 0-1 mm=yr on the central GF, and ~0 mm=yr on its southern third. Modeled depth ranges of creep along the GF allow 5%-25% aseismic release. Greater locking in the southern two-thirds of the GF is consistent with paleoseismic evidence there for large late Holocene ruptures. Because the GF lacks large (> 1 km) discontinuities likely to arrest higher (~1 m) slip ruptures, we expect full-length (54 km) ruptures to occur that include the northern creeping zone. We estimate sufficient strain accumulation on the entire GF to produce Mw 6.9 earthquakes with a mean recurrence of ~575 yr. While the creeping 16 km northern part has the potential to produce an Mw 6.2 event in 240 yr, it may rupture in both moderate (1980) and large events. These two-dimensional-model estimates of creep rate along the southern GF need verification with small aperture surveys. Source


Schwartz P.,Lawrence Berkeley National Laboratory | Percelay J.,Lawrence Berkeley National Laboratory | Ligocki T.J.,Lawrence Berkeley National Laboratory | Johansen H.,Lawrence Berkeley National Laboratory | And 4 more authors.
Communications in Applied Mathematics and Computational Science | Year: 2015

We present an algorithm to produce the necessary geometric information for finite volume calculations in the context of Cartesian grids with embedded boundaries. Given an order of accuracy for the overall calculation, we show what accuracy is required for each of the geometric quantities and we demonstrate how to calculate the moments using the divergence theorem. We demonstrate that, for a known flux, these moments can be used to create a flux divergence of the expected order. © 2015 Mathematical Sciences Publishers. Source

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