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Region 7: Upper Colorado Basin

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Year Published: 2017

Transgressive-regressive cycles in the metalliferous, oil-shale-bearing Heath Formation (Upper Mississippian), central Montana

The Upper Mississippian Heath Formation, which accumulated in the Big Snowy Trough of central Montana, has been known for three decades to contain mudrocks highly enriched in Zn, V, Mo, Ni and other metals, and source rocks for oil. The unit has more recently been recognized as a prospective tight oil play. Here we present petrographic,...

Dumoulin, Julie A.; Johnson, Craig A.; Kelley, Karen D.; Jarboe, Palma J.; Hackley, Paul C.; Scott, Clint; Slack, John F.

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Year Published: 2017

Characteristics and 40Ar/39Ar geochronology of the Erdenet Cu-Mo deposit, Mongolia

The Early to Middle Triassic Erdenet porphyry Cu-Mo deposit, in northern Mongolia, developed in a continent-continent arc collision zone, within the Central Asian orogenic belt. The porphyry system is related to multiple intrusions of crystal-crowded biotite granodiorite porphyry, which formed a composite stock about 900 m in diameter, with...

Kavalieris, Imants; Khashgerel, Bat-Erdene; Morgan, Leah E.; Undrakhtamir, Alexander; Borohul, Adiya
Characteristics and 40Ar/39Ar Geochronology of the Erdenet Cu-Mo Deposit, Mongolia. Imants Kavalieris, Bat-Erdene Khashgerel, Leah E. Morgan, Alexander Undrakhtamir, Adiya Borohul Economic Geology Aug 2017, 112 (5) 1033-1053; DOI: 10.5382/econgeo.2017.4500

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Year Published: 2017

High-resolution seismic characterization of the gas and gas hydrate system at Green Canyon 955, Gulf of Mexico, USA

The Pliocene and Pleistocene sediments at lease block Green Canyon 955 (GC955) in the Gulf of Mexico include sand-rich strata with high saturations of gas hydrate; these gas hydrate accumulations and the associated geology have been characterized over the past decade using conventional industry three-dimensional (3D) seismic data and dedicated...

Haines, Seth S.; Hart, Patrick E.; Collett, Timothy S.; Shedd, William; Frye, Matthew; Weimer, Paul; Boswell, Ray
Seth S. Haines, Patrick E. Hart, Timothy S. Collett, William Shedd, Matthew Frye, Paul Weimer, Ray Boswell, High-resolution seismic characterization of the gas and gas hydrate system at Green Canyon 955, Gulf of Mexico, USA, Marine and Petroleum Geology, Volume 82, April 2017, Pages 220-237

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Year Published: 2017

Implementing Nepal's national building code—A case study in patience and persistence

The April 2015 Gorkha Nepal earthquake revealed the relative effectiveness of the Nepal Standard, or national building code (NBC), and irregular compliance with it in different parts of Nepal. Much of the damage to more than half a million Nepal's residential structures may be attributed to the prevalence of owner-built or owner-supervised...

Arendt, Lucy; Hortacsu, Ayse; Jaiswal, Kishor; Bevington, John; Shrestha, Surya; Lanning, Forrest; Mentor-William, Garmalia; Naeem, Ghazala; Thibert, Kate
Lucy Arendt, Ayse Hortacsu, Kishor Jaiswal, John Bevington, Surya Shrestha, Forrest Lanning, Garmalia Mentor-William, Ghazala Naeem, and Kate Thibert (2017) Implementing Nepal's National Building Code—A Case Study in Patience and Persistence. Earthquake Spectra

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Year Published: 2017

Systematic observations of the slip pulse properties of large earthquake ruptures

In earthquake dynamics there are two end member models of rupture: propagating cracks and self-healing pulses. These arise due to different properties of faults and have implications for seismic hazard; rupture mode controls near-field strong ground motions. Past studies favor the pulse-like mode of rupture; however, due to a variety of...

Melgar, Diego; Hayes, Gavin P.
Melgar, D., & Hayes, G. P. (2017). Systematic observations of the slip pulse properties of large earthquake ruptures. Geophysical Research Letters, 44. https://doi.org/10.1002/ 2017GL074916

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Year Published: 2017

U.S. Geological Survey input-data forms for the assessment of the Spraberry Formation of the Midland Basin, Permian Basin Province, Texas, 2017

In 2017, the U.S. Geological Survey (USGS) completed an updated assessment of undiscovered, technically recoverable oil and gas resources in the Spraberry Formation of the Midland Basin (Permian Basin Province) in southwestern Texas (Marra and others, 2017). The Spraberry Formation was assessed using both the standard continuous (unconventional)...

Marra, Kristen R.
Marra, K.R., 2017, U.S. Geological Survey input-data forms for the assessment of the Spraberry Formation of the Midland Basin, Permian Basin Province, Texas, 2017: U.S. Geological Survey Open-File Report 2017–1117, 46 p., https://doi.org/10.3133/ofr20171117.

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Year Published: 2017

Some results from ModEM3DMT, the freely available OSU 3D MT inversion code

At the 3DEM-5 workshop in 2013, we presented a paper entitled "ModEM: developing 3D EM inversion for the masses", outlining our then recent development of a modular system for inversion of EM geophysical data, called ModEM. As promised in that presentation, we made a version of the code that is suitable for 3D modeling and inversion of...

Egbert, Gary D.; Meqbel, Naser; Kelbert, Anna

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Year Published: 2017

3D ground‐motion simulations of Mw 7 earthquakes on the Salt Lake City segment of the Wasatch fault zone: Variability of long‐period (T≥1  s) ground motions and sensitivity to kinematic rupture parameters

We examine the variability of long‐period (T≥1  s) earthquake ground motions from 3D simulations of Mw 7 earthquakes on the Salt Lake City segment of the Wasatch fault zone, Utah, from a set of 96 rupture models with varying slip distributions, rupture speeds, slip velocities, and hypocenter locations. Earthquake ruptures were prescribed...

Moschetti, Morgan P.; Hartzell, Stephen H.; Ramirez-Guzman, Leonardo; Frankel, Arthur; Angster, Stephen J.; Stephenson, William J.
Moschetti, M. P., Hartzell, S., Ramírez‐Guzmán, L., Frankel, A. D., Angster, S. J., & Stephenson, W. J. (2017). 3D Ground‐Motion Simulations of Mw 7 Earthquakes on the Salt Lake City Segment of the Wasatch Fault Zone: Variability of Long‐Period (T≥ 1 s) Ground Motions and Sensitivity to Kinematic Rupture Parameters. Bulletin of the Seismological Society of America.

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Year Published: 2017

Oxygen stable isotopic disparities among sympatric small land snail species from northwest Minnesota, USA

The oxygen isotopic composition (δ18O) of land snail shells can be a valuable paleoenvironmental archive if the climatic parameters that influence the isotopic system are fully understood. Previous calibration studies have examined a limited number of species or individuals, and most have focused on larger (> 10 mm) taxa, which do not...

Yanes, Yurena; Nekola, Jeffrey C.; Rech, Jason A.; Pigati, Jeffery S.

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Year Published: 2017

Physical properties of sidewall cores from Decatur, Illinois

To better assess the reservoir conditions influencing the induced seismicity hazard near a carbon dioxide sequestration demonstration site in Decatur, Ill., core samples from three deep drill holes were tested to determine a suite of physical properties including bulk density, porosity, permeability, Young’s modulus, Poisson’s ratio, and failure...

Morrow, Carolyn A.; Kaven, J. Ole; Moore, Diane E.; Lockner, David A.
Morrow, C.A., Kaven, J.O., Moore, D.E., and Lockner, D.A., 2017, Physical properties of sidewall cores from Decatur, Illinois: U.S. Geological Survey Open-File Report 2017–1094, 21 p., https://doi.org/10.3133/ofr20171094.

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Year Published: 2017

Recurrent Holocene movement on the Susitna Glacier Thrust Fault: The structure that initiated the Mw 7.9 Denali Fault earthquake, central Alaska

We conducted a trench investigation and analyzed pre‐ and postearthquake topography to determine the timing and size of prehistoric surface ruptures on the Susitna Glacier fault (SGF), the thrust fault that initiated the 2002 Mw 7.9 Denali fault earthquake sequence in central Alaska. In two of our three hand‐excavated trenches, we found...

Personius, Stephen; Crone, Anthony J.; Burns, Patricia A.; Reitman, Nadine G.
Personius, Stephen F., Crone, Anthony J., Burns, Patricia A., and Reitman, Nadine G., 2017, Recurrent Holocene Movement on the Susitna Glacier Thrust Fault: The Structure that Initiated the Mw 7.9 Denali Fault Earthquake, Central Alaska: Bulletin of the Seismological Society of America, Vol. 107, No. 4, pp. 1593–1609, August 2017, doi: 10.1785/0120160286

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Year Published: 2017

U.S. Geological Survey experience with the residual absolutes method

The U.S. Geological Survey (USGS) Geomagnetism Program has developed and tested the residual method of absolutes, with the assistance of the Danish Technical University's (DTU) Geomagnetism Program. Three years of testing were performed at College Magnetic Observatory (CMO), Fairbanks, Alaska, to compare the residual method...

Worthington, E. William; Matzka, Jurgen
Worthington, E. W. and Matzka, J.: U.S. Geological Survey experience with the residual absolutes method, Geosci. Instrum. Method. Data Syst., 6, 419-427, https://doi.org/10.5194/gi-6-419-2017, 2017.

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