PASSCAL Experiments http://www.passcal.nmt.edu/rss/experiments en Grand Canyon rocks http://www.passcal.nmt.edu/scheduledetails/exptnumb/201431 This project holds an opportunity to better understand the effects of rock strength on erosive processes, and to answer specific questions about how erosive strength and fracturing of rocks influences incision of Grand Canyon by the Colorado River and landslide potential of different rock layers in Grand Canyon. This project is an integral part of collaborative incision studies, in that it uses new methods to address the controversy about how important rock strength may be in influencing river incision in Grand Canyon. DRRISWIV - WINTER (DRIS) http://www.passcal.nmt.edu/scheduledetails/exptnumb/201424 Ocean gravity waves are dynamic, changeable elements of the global ocean environment, affected by ocean warming and changes in ocean and atmospheric circulation patterns. Their evolution may thus drive changes in ice-shelf stability by both mechanical interactions, and potentially increased basal melting, which in turn feed back on sea level rise. Our proposed research is intended to discover, through field observations and numerical simulations, how ocean wave-induced vibrations on ice shelves in general, and the Ross Ice Shelf (RIS), in particular, can be used to infer spatial and temporal variability of ice shelf mechanical properties. The mechanical forcing to be examined involves a broad spectrum of surface gravity waves spanning local wind seas (at periods less than 10 s), sea swell (in the 10 - 30 s period band), and infragravity (IG) waves (periods from about 50 to 300 s). POLENET2 mini array http://www.passcal.nmt.edu/scheduledetails/exptnumb/201401 We propose to continue and expand GPS and seismic studies in the ANET-POLENET Phae 2 project in order to advance understanding of geodynamic processes and their influence on the West Antarctic Ice Sheet. The work will, include the continental West Antarctic Rift System (WARS) and its shoulder along the Transantarctic margin of East Antarctica. In partnership with UK colleagues, we propose a new high-resolution crustal and mantle seismic transect that traverses the deepest subglacial basins, including the glacio-dynamically critical Pine Island and Thwaites Glacier regions. Crust and mantle structure of the deepest WARS basins and the Ellsworth-Whitmore mountains crustal block will be resolved by this transect. A nominal plan to reduce ANET by approximately half to a longer-term community 'backbone network' in the final 2 years of this project is presented, contingent on future funding. Note: this instrument request applies to the additional temporary seismic stations needed by POLENET2, and does not describe the 2 additional stations and other upgrades and servicing activities associated with the "backbone" stations. RiceSeisLab http://www.passcal.nmt.edu/scheduledetails/exptnumb/201455 Lab demonstration of seismic experiment for exploration geophysics class on Rice University Campus. We need to do the experiment on Thursday November 13. Cascadia Initiative http://www.passcal.nmt.edu/scheduledetails/exptnumb/201430 This deployment of approximately 15 broadband instruments is to complement the focused OBS array of the Cascadia Initiative. Beginning in July 2014, 20 OBS will be deployed offshore this region with approximate station spacing of 10-15 km. We want to record on land with a comparable station spacing for as long as possible during the 12-15 month OBS deployment. Swells http://www.passcal.nmt.edu/scheduledetails/exptnumb/201454 A feasibility study. We are measuring the frequency of seismic energy generated by ocean waves generated as they break on the beach. NAPA2 RAMP http://www.passcal.nmt.edu/scheduledetails/exptnumb/201452 August 24 2014 West Napa Earthquake Aftershock Deployment RAMP WBSH http://www.passcal.nmt.edu/scheduledetails/exptnumb/201325 Flex array deployment in Wabash Valley seismic zone. The Wabash seismic zone is an intraplate seismic zone in the middle of the continent that has received little attention despite several magnitude 4.5-5+ events in the past 50 years. The seismic structure and many basic characteristics remain unknown. The experiment will comprise a line of 45 broad band instruments across the valley and three 9 component short period phased arrays to probe both the physical structure and the levels of background seismicity occurring in this enigmatic feature. Norway Microbarom http://www.passcal.nmt.edu/scheduledetails/exptnumb/201442 We would like to put out 3 mini infrasound arrays with 1 component each approximately 1 km spacing in Norway during the winter of 2014. UPPA-GL http://www.passcal.nmt.edu/scheduledetails/exptnumb/201403 This project is aimed at studying the crust and mantle structure under Greenland, which reflects the Precambrian to modern tectonic assembly of the island. Seismological data provide important constraints that are otherwise unavailable due to the thick ice sheet that covers most of Greenland. Knowledge of such structure allows us to test hypotheses about the tectonic history of Greenland, the causes of current ice flow, and lateral variations in elastic and viscous strength that control patterns of glacial isostatic adjustment. It also provides important information about the lower boundary condition for the ice sheet, including heat flux, and allows accurate prediction of seismic wave propagation, needed for analysis of earthquake source processes.