PASSCAL Experiments http://www.passcal.nmt.edu/rss/experiments en Wallowa 2 http://www.passcal.nmt.edu/scheduledetails/exptnumb/201625 This seismic experiment will investigate the structure of the crust beneath Northeastern Oregon and southeastern Washington. Previous work in the region, Hales et al. (2005) and Darold and Humphreys (2013) identified a unique style of crustal deformation - unseen elsewhere in the Pacific Northwest. It is the goal of this study to better resolve the spatial and temporal scales involved in this deformation as it is likely linked to tectonic events in the inland northwest throughout the past 15 million years. GAS2016 http://www.passcal.nmt.edu/scheduledetails/exptnumb/201617 Chemical explosions are often used as a proxy to study seismic wave radiation from nuclear explosions. Therefore, it is important to understand the physics of the chemical explosions as a source of seismic waves. One of the important features of the chemical explosions is the release of explosive gases during the explosive detonation, which is often overlooked in seismic studies. Recent observational results from chemical explosions indicate that explosive gas products may significantly affect the radiated seismic waves. For example, it is known that a higher amount of gas released in a chemical explosion results in an increase in rock damage due to the opening and propagation of fractures. However the effect of the cavity gas and the rock damage affects the far-field seismic radiation is not well understood. The field experiment is designed in order to quantify the influence of gaseous products on seismic amplitudes We will use the explosives with different amount of gaseous by-products but similar velocities of detonation. This can be achieved by adding aluminum powder to the explosive mix in order to reduce the volume of gas produced by the explosion and released into in the cavity. Adding aluminum may slightly reduce the velocity of detonation, but to a lesser degree than using different explosives. The hypothesis being tested is: "Does an increase in the volume of cavity gas cause an increase in the low frequency component of the spectra?" The analysis of the seismic signals from explosions conducted using explosives with different amounts of gas detonation products should provide: (a) insight into the role of gas effects on seismic wave generation, which is essential if chemical explosions are to be used as surrogates for nuclear tests and (b) improved methods of discriminating chemical explosions from small nuclear explosions. Of particular interest are the differences in the body (P and S) and surface (Rg and Lg) wave radiation as a function of the gas content. WavefieldsDemo http://www.passcal.nmt.edu/scheduledetails/exptnumb/201612 The goal of this experiment is to train the IRIS community on new acquisition techniques through a demonstration of full wavefield observations, using a range of instrumentation to make observations at multiple spatial and temporal scales. The goal of these new techniques being to increase resolution and reduce aliasing - while optimizing the pool usage (using the right instruments for the right part of the spectrum). The demonstration experiment will utilize our existing pool of instrumentation as well as some newer technology to demonstrate new capabilities and modes of operation and will result in an open dataset for the community to explore. Perdigao http://www.passcal.nmt.edu/scheduledetails/exptnumb/201639 I would like to have three surface mounted seismometers (Sercel L-28-3D High Frequency Sensors) to measure in conjunction with our studies on downslope flow (linked to - but separate from - my other PASSCAL instrumentation project). We likely woudl NOT need the solar panels because we can link them to existing power. The field experiment STARTS in January 2017 and ENDS in July 2017. OUFG2016 http://www.passcal.nmt.edu/scheduledetails/exptnumb/201602 Field geophysics class. Purpose is to collect shallow reflection and refraction data over landslides in the Coast Range and active faults in central Oregon. 2016 IAS http://www.passcal.nmt.edu/scheduledetails/exptnumb/201620 Imaging faults near Socorro, NM WVF (pronounced WOLF) http://www.passcal.nmt.edu/scheduledetails/exptnumb/201604 Thirty-seven broadband seismic stations will be deployed at the eastern end of the Alaska slab and the Wrangell Volcanic Field for 15 months, in order to study the subduction of the Yakutat terrane. At this time the fate and consequences of subducting the Yakutat terrane is unknown. The project will focus on understanding the tectonic setting of the Wrangell Volcanic Field and its connection to the Alaskan slab. OK GAP http://www.passcal.nmt.edu/scheduledetails/exptnumb/201616 This experiment monitors seismicity within the Nemaha uplift region of northern Oklahoma, a region with abundant seismicity. 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. Yucca Valley http://www.passcal.nmt.edu/scheduledetails/exptnumb/201632 A 3 km long line, 5 meter spacing, using seismic refraction and reflection to look for buried faults