Message from BLM: We are pleased to announce new, exciting positions available at BLM – BUREAU OF LAND MANAGEMENT. It is our hope that qualified, career oriented individuals at your organization or other professionals known to you will actively consider this position and apply accordingly. Efforts on your part to disseminate this information are greatly appreciated.
Calling all photographers! NBMG is still accepting photographs for the 2015 Nevada Geology CalendarthroughJune 30, 2014. If you have photographs of interesting geologic features or landscapes from your fieldwork that you would like to submit for next year’s calendar, please email Jack Hursh at NBMG (firstname.lastname@example.org).
Here are the details for this contest for the 2015 calendar:
Deadline for entries is June 30, 2014.
Photos need to be taken in Nevada. A location description and/or GPS coordinates should accompany submissions along with description.
High-quality, high-resolution photo files of at least 300 dpi are required for quality printing.
The following message is forwarded from Drew Decker and Carol Ostergren at the U.S. Geological Survey.
From: smac list On Behalf Of Decker, Drew Sent: Wednesday, May 14, 2014 10:58 AM Subject:[SMAC] Pacific Region geospatial data announcements
Here are a few mapping-related announcements that you may be interested in:
National Hydrography Dataset (NHD) releases Web HEM Tool. HEM stands for Hydrography Event Management and is a tool developed to help relate users’ data to the NHD network as events. Please see announcement on pages 4 and 5 in the latest NHD Newsletter here: http://nhd.usgs.gov/newsletters/News_13_6_April.pdf
New urban imagery is now available for a number of California cities. The datasets are natural color and have a one foot resolution. The data cover the Fresno, Modesto, Oxnard, Stockton, and Sacramento urban areas. Data can be downloaded through the EarthExplorer site: earthexplorer.usgs.gov (all cities) and The National Map Viewer site: nationalmap.gov/viewer (all except Modesto).
USTopo maps go into production for CA and NV in December, 2014. Please consider validating structure points (hospitals, post offices, schools, etc.) through our National Map Corps program. Watch for upcoming webinars. https://my.usgs.gov/confluence/display/nationalmapcorps/Home [Additional note: these new edition maps will include PLSS information.]
Bill Hammond and Geoff Blewitt (both of Nevada Bureau of Mines and Geology/Nevada Geodetic Laboratory and Nevada Seismological Laboratory in the College of Science at UNR) are co-authors on this paper released online May 14, 2014 in the journal Nature.
Uplift and seismicity driven by groundwater depletion in central California By Colin B. Amos, Pascal Audet, William C. Hammond, Roland Bürgmann, Ingrid A. Johanson, and Geoffrey Blewitt
Abstract: “Groundwater use in California’s San Joaquin Valley exceeds replenishment of the aquifer, leading to substantial diminution of this resource [references 1-4] and rapid subsidence of the valley floor [reference 5]. The volume of groundwater lost over the past century and a half also represents a substantial reduction in mass and a large-scale unburdening of the lithosphere, with significant but unexplored potential impacts on crustal deformation and seismicity. Here we use vertical global positioning system measurements to show that a broad zone of rock uplift of up to 1–3 mm per year surrounds the southern San Joaquin Valley. The observed uplift matches well with predicted flexure from a simple elastic model of current rates of water-storage loss, most of which is caused by groundwater depletion [reference 3]. The height of the adjacent central Coast Ranges and the Sierra Nevada is strongly seasonal and peaks during the dry late summer and autumn, out of phase with uplift of the valley floor during wetter months. Our results suggest that long-term and late-summer flexural uplift of the Coast Ranges reduce the effective normal stress resolved on the San Andreas Fault. This process brings the fault closer to failure, thereby providing a viable mechanism for observed seasonality in microseismicity at Parkfield [reference 6] and potentially affecting long-term seismicity rates for fault systems adjacent to the valley. We also infer that the observed contemporary uplift of the southern Sierra Nevada previously attributed to tectonic or mantle-derived forces [references 7-10] is partly a consequence of human-caused groundwater depletion.”