PASSCAL Experiments http://www.passcal.nmt.edu/rss/experiments en ENAM CSE USGS http://www.passcal.nmt.edu/scheduledetails/exptnumb/201538 The project is an active-source and broadband, onshore and offshore seismic experiment that is focused on the East Coast margin around Cape Hatteras. The study area, encompasses the rifted margin, from unextended continental lithosphere onshore to mature oceanic lithosphere offshore, as well as along-strike changes in margin structure and two major fracture zones that are associated with significant offsets at the modern Mid-Atlantic Ridge. The study also covers several features representing the post-rift modification of the margin by slope instability and fluid flow. MT and Seismic at Okmok http://www.passcal.nmt.edu/scheduledetails/exptnumb/201517 Our goal is to image the entire volcanic system at Okmok caldera through use of seismic and magnetotelluric tomographic methods. Peru Hydrology http://www.passcal.nmt.edu/scheduledetails/exptnumb/201526 As the tropical alpine glaciers of the world are melting due to climate change sensitivity, there is an increased strain on water resources that are provided by seasonal glacial melt water. The Rio Santa in Peru currently flows regularly year-round, despite the six months of the year in which there is very little precipitation. This river is the source of water for agricultural, industrial, and personal use, as well as hydroelectric power generation, for a large portion of Peruvian population that occupies the surrounding watershed. As the glaciers of the Cordillera Blanca disappear (and many will be completely gone within decades), the dry season discharge of the alpine streams will be reduced. In order to understand the groundwater storage capacity of the surrounding valleys, we will be conducting seismic refraction surveys in the high alpine valleys, especially focused on the structure of buried talus and rock slide deposits, potential storage aquifers that can release water slowly throughout the year. The geophysical surveys will serve to better understand groundwater storage capacity and residence time in the watershed, and will be used to inform a predictive groundwater model involving the storage of precipitation in the absence of glaciers. Mackenzie Mountains http://www.passcal.nmt.edu/scheduledetails/exptnumb/201603 The Mackenzie Mountains Experiment aims to understand the reason mountains are forming 500 miles inland from the nearest plate boundary, while little deformation occurs closer to the boundary. This experiment will extend nearly from the plate boundary to the stable Canadian craton in a transect that extends 500 miles through Northwest Canada. RAPID: Nepal Earthquake http://www.passcal.nmt.edu/scheduledetails/exptnumb/201545 This request is for a rapid response following the Mw 7.9 earthquake of April 25, 2015 in Nepal. The goal is to deploy a 20-station network in the greater epicentral area of the mainshock to record its aftershocks. We expect to operate the network for full 6 months after its deployment is completed. This experiment will combine geodetic and seismological observations. PASSCAL data from this project will be released to the public within 1 month after the array is uninstalled. FLATS http://www.passcal.nmt.edu/scheduledetails/exptnumb/201418 The 5-year project proposes a deployment of 12 broadband stations for four years to target local seismicity occurring within and below Nenana basin, an active backarc basin in central Alaska. The basin is associated with Minto Flats seismic zone, which contains two main fault strands. The principal goals of the project are to characterize the 3D structure of the fault zone, through seismicity studies, and to understand the relationship between deep crustal faulting and active basin formation. No station, short period or broadband, has ever been deployed in the vicinity of the basin. Taku seismic http://www.passcal.nmt.edu/scheduledetails/exptnumb/201542 A seismic reflection study to characterize yearly and seasonal changes in the subglacial environment at the terminus of Taku Glacier, Southeast Alaska. CARMA http://www.passcal.nmt.edu/scheduledetails/exptnumb/201530 Investigating Flat Slab Subduction and Plate Edge Tectonics in Northern South America. Environment is tropical jungle/plains/low mountain and high mountain OIINK (AKA SDYNAC) http://www.passcal.nmt.edu/scheduledetails/exptnumb/201133 The proposed array is a 3-D, broadband, passive seismic array centered over the depocenter of the Illinois Basin. The array was designed to provide enhanced station density or 3 to 1 relative to the Earthscope TA. The design builds on the experience of the first major EarthScope FA experiment (SNEP) that was set up in the southern Sierra Nevada. We will occupy 120 stations over a 3-year period coinciding with the deployment of the TA; site occupation will roll in four distinct stages using a maximum of 60 simultaneously operating stations. If funded in this form the experiment will aim to match recording periods of the TA in the region as much as possible. Experiment will use FA telemetry for as many stations as possible. Shale Hills Seismic http://www.passcal.nmt.edu/scheduledetails/exptnumb/201522 We plan to deploy shallow seismic surveys at the Shale Hills Critical Zone Observatory to measure both the depth to unweathered bedrock and fracture density depth profiles. We will use p-wave velocities and Vp/Vs ratios to estimate changes in porosity with depth, and relate these changes to fracture densities measured from borehole data collected at the Shale Hills CZO. We will pair these surveys with resistivity measurements at the site.