Seismicity and active faulting of the Kanab‐Fredonia area of the southern Colorado Plateau

Brumbaugh, D. S.

doi:10.1029/2007jb005278

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…[8] Sparse focal mechanisms and other stress indicators along the CP-southern BR transition zone indicate NE-SW oriented extension [e.g., Zoback and Zoback, 1980;Brumbaugh, 2008], consistent with focal mechanisms of small earthquakes within the plateau [e.g., Wong and Humphrey, 1989]. Menges and Pearthree [1989] infer a belt of longwavelength uplift across the transition zone based on regional topographic anomalies and dissection patterns.…”

Section: Tectonic Settingmentioning

confidence: 86%

Present‐day motion and deformation of the Colorado Plateau

Kreemer

Blewitt

Bennett

2010

Geophysical Research Letters

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We analyze data from continuous GPS stations in the southwestern United States and present the first observations of a systematic motion of the Colorado Plateau region. Relative to a North America‐fixed reference frame, westward velocities increase rapidly across the Wasatch fault system, which comprises the plateau's northwestern margin, but increase more gradually between the Great Plains and the Mojave Desert province. We detect no significant extension across most of the Rio Grande Rift, but extension could be as high as ∼0.5 mm yr−1 along its southernmost portion. We suggest that the motion between the plateau and stable continent may partly be accommodated instead across the Jemez Lineament. Only when we consider GPS velocities within the plateau's center, do the data support a rigid body rotation of 0.103° Ma−1 around a pole in the northern Rocky Mountains. We conclude that active extension has encroached into the plateau from both the east and west.

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Section: Tectonic Settingmentioning

confidence: 86%

Present‐day motion and deformation of the Colorado Plateau

Kreemer

Blewitt

Bennett

2010

Geophysical Research Letters

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“…One of the largest recorded events on the Colorado Plateau was the Kanab-Fredonia earthquake in 1957, which was a magnitude 5.7. Historically no events have resulted in surface ruptures, but earthquake activity suggests that the Sevier fault is still experiencing extensional strain (Brumbaugh, 2008).…”

Section: Sevier Normal Fault Activitymentioning

confidence: 99%

Geomorphology and Geochronology of Sand Ramps Adjoining the Coral Pink Sand Dunes, Kane County, Utah

Spuller¹

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Projected climate change is expected to have widespread impacts on arid regions of the world. Inland, continental dune fields are sensitive to changes in climate and the surrounding environment and are an important source for understanding interactions between Earth's surface, atmosphere, and biosphere in drylands. Reconstructing past periods of aeolian activity from dune fields can provide insights into how landscapes have responded to previous changes in climate. However, the nature of aeolian systems to recycle older deposits leads to a preservation bias towards only the youngest deposits. Targeting geomorphic settings that are conducive to preserving older records is critical to reconstructing longer and more complete records of landscape change. This MS thesis is divided into three chapters. Chapter One describes the geomorphology and geochronology of sand ramps adjacent to the lower dune field in the Coral Pink Sand Dunes, Utah. Chapter Two is written as a manuscript to be submitted as a Brief Research Report to Frontiers in Earth Science-Quaternary Science, Geomorphology and Paleoenvironment Section. Chapter Two discusses the results of the first chapter in the context of regional paleoclimate and geomorphic records to identify drivers of aeolian activity. Chapter Three is a summary of major findings and discusses suggestions for future work. Chapter One investigates sand ramps in the Coral Pink Sand Dunes (CPSD), Utah, a fault-bound dune field located on the northwestern Colorado Plateau. Sand ramps are topographically-controlled features composed of alluvial, fluvial, and aeolian viii TABLE OF CONTENTS

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Seismicity within Arizona during the Deployment of the EarthScope USArray Transportable Array

Lockridge¹,

Fouch²,

Arrowsmith³

2012

Bulletin of the Seismological Society of America

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i ABSTRACT The goal of this study is to gain a better understanding of earthquake distribution and regional tectonic structure across Arizona. To achieve this objective, I utilized seismic data from EarthScope's USArray Transportable Array (TA), which was deployed in Arizona from April 2006 to March 2009. With station spacing of approximately 70 km and ~3 years of continuous three-component broadband seismic data, the TA provided an unprecedented opportunity to develop the first seismicity catalog for Arizona without spatial sampling bias. In this study I developed a new data analysis workflow to detect smaller scale seismicity across a regional study area, which serves as a template for future regional analyses of TA data and similar datasets.The final event catalog produced for this study increased the total number of earthquakes documented in Arizona by more than 50% compared to the historical catalog, despite being generated from less than three years of continuous waveform data. I combined this new TA catalog with existing earthquake catalogs to construct a comprehensive historical earthquake catalog for Arizona. These results enabled the identification of several previously unidentified areas of seismic activity within the state, as well as two regions characterized by seismicity in the deeper (>20 km) crust. The catalog also includes 16 event clusters, 10 of which exhibited clear temporal clustering and swarm-like behavior. These swarms were distributed throughout all three physiographic provinces, suggesting that earthquake swarms occur regardless of tectonic or physiographic setting. I also conducted a case study for an earthquake swarm in June of 2007 near Theodore Roosevelt Lake, approximately 80 miles northeast of Phoenix. Families of events showed very ii similar character, suggesting a nearly identical source location and focal mechanism. We obtained focal mechanisms for the largest of these events, and found that they are consistent with normal faulting, expected in this area of the Arizona Transition Zone. Further, I observed no notable correlation between reservoir water level and seismicity. The occurrence of multiple historical earthquakes in the areas surrounding the reservoir indicates that this swarm was likely the result of tectonic strain release, and not reservoir induced seismicity.iii ACKNOWLEDGMENTS

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Seismicity and active faulting of the Kanab‐Fredonia area of the southern Colorado Plateau

Cited by 6 publications

References 11 publications

Present‐day motion and deformation of the Colorado Plateau

Present‐day motion and deformation of the Colorado Plateau

Geomorphology and Geochronology of Sand Ramps Adjoining the Coral Pink Sand Dunes, Kane County, Utah

Seismicity within Arizona during the Deployment of the EarthScope USArray Transportable Array

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