PASSCAL Experiments http://www.passcal.nmt.edu/rss/experiments en SJFZ_SAF http://www.passcal.nmt.edu/scheduledetails/exptnumb/201512 The San Jacinto fault zone is the most seismically-active branch of the San Andreas system in southern California, with accelerated activity of M5+ events in recent years. We propose integrated multi-scale multi-signal studies of spatio-temporal variations of earthquake sources, geodetic motion, rock properties, stresses and fluids within and around the SJFZ, deformation of its ductile root, geometry of the underlying Moho, and lateral connections to the San Andreas fault. The studies will provide fundamental quantitative information on the system behavior of a major branch of the plate-boundary in southern California having high current seismic hazard. The project will augment excellent regional and local infrastructure with key seismic, geodetic, and magneto-telluric observations aiming to provide state-of-the-art knowledge on coupled evolution of earthquakes and fault zone properties. Rupture-meters consisting of creep meters and accelerometers will span several fault sections where large events are expected. We will develop a detailed structural model integrating scales ranging from interfaces and damage zones comprising the internal fault zone structure to the regional plate-boundary framework and the underlying ductile substrate. The model will be derived using joint analyses of travel time and waveform tomography of local earthquakes, ambient seismic noise, fault zone head and trapped waves, seismic anisotropy and attenuation, magneto telluric data, receiver functions, and additional analyses of reflected/transmitted phases from prominent horizontal and vertical interfaces. The structural model will be linked to geodetic data characterizing the steady and transient strain fields, locking depths, and deformation in the downward continuation of different fault sections. The various types of geophysical data will provide, in conjunction with theoretical analyses, strong constraints on the stresses, fluids, and effective rheology. Accurate local and regional seismicity catalogs will be used to characterize geometrical properties of all seismically active volumes and evolutionary seismicity patterns. The project will establish a unique natural laboratory for studying connections between the SAF and SJFZ, processes and conditions preceding M>7 type events on a continental transform fault, and co- and post-seismic fields associated with such an earthquake if/when it occurs (we intend to leave as many instruments as possible in the field beyond the project duration by integrating them into existing networks). The research will phase in over five years, will leverage UNAVCO resources and related collaborations to be cost-effective, and will complement studies by other investigators focusing on other major fault zones. LaMa http://www.passcal.nmt.edu/scheduledetails/exptnumb/201507 Deploy 30 PASSCAL broadband stations in late 2015 or early 2016 for approximately 18 months to complement 12 UW broadband stations that will be deployed in late 2014 or early 2015, subject to the NSF IES project being funded. The project goal is to image the magma chamber beneath the Laguna del Maule volcanic center. Laguna del Maule has the potential to become the site of a caldera-forming eruption. 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. AAA (triple A) http://www.passcal.nmt.edu/scheduledetails/exptnumb/201502 Four mini seismic arrays will be installed in Unalaska Island. They will image a variety of seismic events from the subduction zone including tremor, low frequency earthquakes associated with slow earthquakes and regular fast earthquakes. They will also capture events from nearby volcanoes (Makushin and Akutan) allowing us to better understand the volcanic plumbing systems. The arrays are designed to simultaneously image both subduction and volcanic system. SPE5 http://www.passcal.nmt.edu/scheduledetails/exptnumb/201509 This is an experiment to reoccupy Transportable Array (TA) sites around the Nevada National Security Site (formerly known as the Nevada Test Site) where the largest in a series of chemical explosions will be conducted. The SPE5 shot is a 5000 kg explosion in granite and should be observed at regional distances. This shot has been delayed from the original date of October 2013 and is currently scheduled for May 2015. LIGO http://www.passcal.nmt.edu/scheduledetails/exptnumb/201516 We will be installing magnetic field monitoring stations close to the LIGO Observatories in Hanford WA and Livingston LA. See ligo.org for a description of this NSF funded experiment trying to detect gravitational waves. Global magnetic fields from the Schumann resonances are creating common noise in these two detectors. We are hoping to install very low noise magnetometers close (within 10s of km) to the observatories. Through discussions with Noel Barstow of PASSCAL we converged on the request for two RefTek RT 130 Dataloggers, plus associated solar power (Panels). North Texas Earthquake Study http://www.passcal.nmt.edu/scheduledetails/exptnumb/201519 Recording earthquakes in North Texas in order to refine the locations and depths. All data to be immediately open. SJFZ_SAF http://www.passcal.nmt.edu/scheduledetails/exptnumb/201512 The San Jacinto fault zone is the most seismically-active branch of the San Andreas system in southern California, with accelerated activity of M5+ events in recent years. We propose integrated multi-scale multi-signal studies of spatio-temporal variations of earthquake sources, geodetic motion, rock properties, stresses and fluids within and around the SJFZ, deformation of its ductile root, geometry of the underlying Moho, and lateral connections to the San Andreas fault. The studies will provide fundamental quantitative information on the system behavior of a major branch of the plate-boundary in southern California having high current seismic hazard. The project will augment excellent regional and local infrastructure with key seismic, geodetic, and magneto-telluric observations aiming to provide state-of-the-art knowledge on coupled evolution of earthquakes and fault zone properties. Rupture-meters consisting of creep meters and accelerometers will span several fault sections where large events are expected. We will develop a detailed structural model integrating scales ranging from interfaces and damage zones comprising the internal fault zone structure to the regional plate-boundary framework and the underlying ductile substrate. The model will be derived using joint analyses of travel time and waveform tomography of local earthquakes, ambient seismic noise, fault zone head and trapped waves, seismic anisotropy and attenuation, magneto telluric data, receiver functions, and additional analyses of reflected/transmitted phases from prominent horizontal and vertical interfaces. The structural model will be linked to geodetic data characterizing the steady and transient strain fields, locking depths, and deformation in the downward continuation of different fault sections. The various types of geophysical data will provide, in conjunction with theoretical analyses, strong constraints on the stresses, fluids, and effective rheology. Accurate local and regional seismicity catalogs will be used to characterize geometrical properties of all seismically active volumes and evolutionary seismicity patterns. The project will establish a unique natural laboratory for studying connections between the SAF and SJFZ, processes and conditions preceding M>7 type events on a continental transform fault, and co- and post-seismic fields associated with such an earthquake if/when it occurs (we intend to leave as many instruments as possible in the field beyond the project duration by integrating them into existing networks). The research will phase in over five years, will leverage UNAVCO resources and related collaborations to be cost-effective, and will complement studies by other investigators focusing on other major fault zones. RAMP1 http://www.passcal.nmt.edu/scheduledetails/exptnumb/201520 We will be completing seismic surveys over a known relay ramp in the Alvord Basin along with ground temperature surveys aimed at characterizing heat flow in active geothermal areas. GreenISE http://www.passcal.nmt.edu/scheduledetails/exptnumb/201511 The Greenland Ice Seismic Experiment (GreenISE) is to investigate the structure of a perennial firn aquifer found near the surface of the Greenland ice sheet. The experiment uses high frequency active source refraction seismology to probe the hydrology and structure of the uppermost firn and ice layers of the ice sheet and four separate locales. Locations will be visited in the spring and fall to determine the variation in hydrologic setting over the Greenland summer and characterize the role of surface melting processes in ice sheets.