Seismicity and Tectonics of the Blue Ridge Area of the Mogollon Plateau, Arizona

Brumbaugh, D. S.

doi:10.1785/0120060196

Cited by 6 publications

(8 citation statements)

References 6 publications

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“…3 shows the two principal fracture directions of this region as indicated by surface mapping of faults. The northwest-trends of the faults of the Cataract Creek system are in fact close in strike to the nodal planes of fault plane solutions for this region's earthquakes (Lay et al, 1994;Brumbaugh, 2005Brumbaugh, , 2008. The largest event in Arizona since the 1959 Fredonia earthquake of Richter magnitude (M L ) 5.75 was the 1993 M W 5.3 Cataract Creek earthquake (Bausch and Brumbaugh, 1994;Lay et al, 1994).…”

Section: A Comparison Of Swarm Spatial Characteristicsmentioning

confidence: 70%

“…The aftershocks in map view show a linear trend of epicenters parallel to this northwest direction and almost orthogonal to the northeast-trend of the Sunset Crater epicenters (Sanders, 1996). Previous to this study there have been no fault plane solutions from northern Arizona seismicity that would indicate fault slip on northeast-trending surfaces (Lay et al, 1994;Brumbaugh, 2005Brumbaugh, , 2008.…”

Section: A Comparison Of Swarm Spatial Characteristicsmentioning

confidence: 85%

“…The trend of the pattern of distribution of epicenters of the Sunset Crater swarm is northeast-southwest which is similar to the general trend of the Mesa Butte fault system. This system has not shown active fault slip since seismic monitoring began in 1973 as deduced from lack of seismicity along it and diametrically opposed trends of northern Arizona fault plane solutions (Lay et al, 1994;Brumbaugh, 2005Brumbaugh, , 2008. The northwest-trending fracture systems such as the Cataract Creek in contrast are well represented by seismicity and fault plane solution nodal plane trends that parallel the trend of the fracture system.…”

Section: Discussionmentioning

confidence: 99%

“…A sequence at Blue Ridge, Arizona, well to the southeast of the SFVF, contained a clear foreshock doublet of duration magnitude (M D ) 3.9 and 4.0 two days apart followed by the main shock of M D 4.6 on March 2, 2005 (Brumbaugh, 2008). This was followed by an aftershock train that lasted until November 2005.…”

Section: Seismicity Of Northern Arizonamentioning

confidence: 99%

“…The Blue Ridge sequence can therefore be considered an example of a tectonic Type 2 sequence. Fault plane solutions for the Blue Ridge foreshocks and mainshock have nodal planes parallel to the northwest trend of the Cataract Creek system that encloses the Blue Ridge area (Brumbaugh, 2008).…”

Section: Seismicity Of Northern Arizonamentioning

confidence: 99%

See 4 more Smart Citations

Analysis of the 2009 earthquake swarm near Sunset Crater volcano, Arizona

Brumbaugh

Hodge

Linville

et al. 2014

Journal of Volcanology and Geothermal Research

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Section: A Comparison Of Swarm Spatial Characteristicsmentioning

confidence: 70%

Section: A Comparison Of Swarm Spatial Characteristicsmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Seismicity Of Northern Arizonamentioning

confidence: 99%

Section: Seismicity Of Northern Arizonamentioning

confidence: 99%

See 3 more Smart Citations

Analysis of the 2009 earthquake swarm near Sunset Crater volcano, Arizona

Brumbaugh

Hodge

Linville

et al. 2014

Journal of Volcanology and Geothermal Research

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

Brumbaugh¹

2008

J. Geophys. Res.

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Detailed study of the historic seismicity of the Kanab‐Fredonia area adds information to the location of the Colorado Plateau tectonic boundary in this area and to the nature of contemporary seismicity and faulting on this part of the Colorado Plateau. Historic seismicity over 45 years (1959–2004) defines a band of activity which extends through Fredonia, Arizona and into southern Utah around Kanab. The area is dominated by north trending high‐angle normal faults. The spatial distribution of epicenters consists of clusters associated with the West Kaibab, Big Springs, and Toroweap‐Sevier faults indicating that these faults may be active. Four focal mechanism solutions show Basin‐Range style high‐angle normal faulting on north to north‐northwest trending surfaces that are parallel to subparallel in most cases to mapped Quaternary faults. This suggests a present east‐west extension occurring on the southern Colorado Plateau for the Kanab‐Fredonia area and an expansion of the adjacent Basin‐Range province eastward into the plateau as far as the West Kaibab/Big Springs faults. The West Kaibab/Big Springs faults are proposed to be the tectonic boundary of the southern Colorado Plateau in this area since they mark the limit of significant seismic activity that is combined with Basin‐Range type faulting.

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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 Tectonics of the Blue Ridge Area of the Mogollon Plateau, Arizona

Cited by 6 publications

References 6 publications

Analysis of the 2009 earthquake swarm near Sunset Crater volcano, Arizona

Analysis of the 2009 earthquake swarm near Sunset Crater volcano, Arizona

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

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

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