Archive | July 2012

Feedback requested: NBMG User Survey

Nevada Bureau of Mines and Geology has prepared a questionnaire to better understand the value and impacts of its products, such as geologic maps and other publications, and determine which functions and products are most critical for the future.

If you would like to help us with this assessment, you can download the survey at this link on our website:

Link to questionnaire here

We request that the questionnaire be returned to Charlotte Stock at cstock@unr.edu by no later than July 31, 2012.   Additional information about submitting the questionnaire is contained within the document.

Thanks very much for your assistance.

Best regards,

Jim Faulds
Director/State Geologist
Nevada Bureau of Mines and Geology
University of Nevada, Reno
Reno, NV 89557
Tel: 775-682-8751
jfaulds@unr.edu

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Reminder: new geodesy class this Fall 2012

Geoff Blewitt, Research Professor at NBMG, will teach a new geodesy class this Fall 2012 offered by the Department of Physics at the University of Nevada.  The class is PHYS 484/694 Special Problems in Physics: "Physics and Engineering of GPS."  It will cover the physics and engineering principles of the Global Positioning System for millimeter-precision positioning and sub-nanosecond timing.

http://www.nbmg.unr.edu/Staff/Blewitt.html

New at NBMG: Map 178 – A geodetic strain rate model for the Pacific-North American plate boundary, western United States

by Corné Kreemer, William C. Hammond, Geoffrey Blewitt, Austin A. Holland, and Richard A. Bennett

2012

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This map presents a model of crustal strain rates derived from Global Positioning System (GPS) measurements of horizontal station velocities. The model indicates the spatial distribution of deformation rates within the Pacific–North America plate boundary from the San Andreas fault system in the west to the Basin and Range province in the east. As these strain rates are derived from data spanning the last two decades, the model reflects a best estimate of present-day deformation. However, because rapid transient effects associated with earthquakes (i.e., postseismic deformation resulting in curvature of the GPS time-series) have been removed from the GPS data, these strain rates can be considered representative of the interseismic, steady-state deformation associated with the accumulation of strain along faults. This model is useful for both seismic-hazard and geodynamic studies to understand the activity rates of (known and unknown) faults and the plate tectonic boundary and buoyancy forces that cause the deformation, respectively. In more slowly deforming areas we expect fewer, smaller earthquakes and infrequent large earthquakes will have a much longer recurrence time compared to those in rapidly deforming areas.

Available on the Web – plate

Please note: this file is very large (40.4 MB) and may take some time to download.

Map 178, one 48×46-inch color plate; scale 1:1,500,000; rolled only; $46.00

Map 178a, one 48×46-inch color plate printed at 91% of original size to fit on 44×42-inch paper; original scale 1:1,500,000; rolled or folded; $18.00

GPS data and Death Valley Fault Zone

Faculty from Nevada Geodetic Laboratory (NGL) recently published an article on Death Valley (J. Geophys. Res., 117, B06404,doi:10.1029/2011JB008552). Their research uses GPS data from the NGL MAGNET network to infer an interpretation of geologic evolution of Death Valley over the last 6 million years.

Click here to read the article:

http://www.nbmg.unr.edu/staff/pdfs/2011JB008552.pdf

Nevada Geodetic Laboratory in Geology magazine

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Contemporary uplift of the Sierra Nevada, western United States, from GPS and InSAR measurements,

by William C. Hammond, Geoffrey Blewitt, Zhenhong Li, Hans-Peter Plag, and Corné Kreemer (Geology, July 2012, v. 40, no. 7)

http://geology.gsapubs.org/content/40/7/667.abstract

Access the full manuscript at this link:

http://geodesy.unr.edu/

Silver & Blue features Nevada Geodetic Laboratory

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 Research by Bill Hammond and Geoff Blewitt (NBMG’s Nevada Geodetic Laboratory) is featured in two news articles by Mike Wolterbeek in the latest Silver & Blue (Summer 2012) on page 23:

  •  Uplift tracked by scientists shows Sierra Nevada is on the rise
  •  GPS technology is basis for NASA quake-monitoring test

http://www.unr.edu/silverandblue/archive/2012/summer/NSB_Summer_2012_22-26.pdf

http://www.unr.edu/silverandblue/