Analysis of Seismic Activity near Theodore Roosevelt Dam, Arizona, during the Occupation of the EarthScope/USArray Transportable Array

Lockridge, J.; Fouch, M. J.; Arrowsmith, J Ramón; Linkimer, Lepolt

doi:10.1785/0220120034

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…This is in contrast to b-values reported for tectonic environments in Arizona where faulting is the sole method of strain release that are closer to or often below 1.0 (Table 1). The average b-value for the state of Arizona is 0.9 (Lockridge et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The Transportable Array deployment during 2006-2008 across Arizona resulted in the detection of other sequences, some of a "swarm-like" nature (Lockridge et al, 2012). The 2007 sequence of events near Roosevelt Lake in the Transition Zone of Arizona, as described by the authors had characteristics of Type 1 mainshock-aftershock activity (Lockridge et al, 2012).…”

Section: Seismicity Of Northern Arizonamentioning

confidence: 95%

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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: Discussionmentioning

confidence: 99%

Section: Seismicity Of Northern Arizonamentioning

confidence: 95%

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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“…Labeled faults are Algodones (A) and Santa Rita (SR). Inset shows crustal thickness with contours (km) (Laske et al, 2013) and focal mechanisms of earthquakes ∼M w 3.1 and greater from Kreemer, Blewitt, and Hammond (2010) and references therein, USGS ANSS ComCat (U.S. Geological Survey, 2019), Lockridge, Fouch, Arrowsmith, & Linkimer (2012), Eberhart-Phillips et al (1981), Global CMT (Dziewonski et al, 1981;Ekstrom et al, 2012), and Suter (2008). El Mayor-Cucapah earthquake (EMC), Sonoran earthquake (S).…”

Section: Tectonic and Geologic Settingmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

Geodetic Extension Across the Southern Basin and Range and Colorado Plateau

et al. 2021

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Elastic strain accumulation in the Earth's crust is the primary driver of continental earthquakes and can pose significant seismic hazards. Regional studies of seismic hazard in the southern Basin and Range Province (SBR) and Colorado Plateau Province (CP) include assessments of risk to transportation (Euge et al., 1992), buildings (Ghanat et al., 2015, hydro-electric power, and water resources (Lockridge, Fouch, Arrowsmith, & Linkimer, 2012) and the Palo Verde nuclear power plant (U.S. Nuclear Regulatory Commission, 2016). Strain rates can be used with seismicity, fault location, and slip rate data to characterize areas of deformation and enhance regional assessments of potential seismic hazard.The crustal strain-rate field in diffuse plate boundary zones can be affected by both long-term and shortterm processes. Improved understanding of the long-term deformation patterns can be incorporated into models of plate boundary zone hazards (e.g., Petersen et al., 2014) and provide constraints for studies of the forces that act on the lithosphere (e.g., Flesch & Kreemer, 2010). Strain rates along the Wasatch fault zone of the northwestern margin of the CP have been the focus of numerous studies (e.g., Bennett et al., 2003;Niemi et al., 2004) and are better constrained than along the southern and southwestern margin. The poor constraints in the latter areas are due to the low levels of deformation and, until recently, the sparseness of data in southern Utah, southern Nevada, Arizona, and New Mexico.In this study, we analyze crustal motions in the SBR and southern portion of the CP (Figure 1) using two regional densifications of the EarthScope Plate Boundary Observatory (PBO) (Herring et al., 2016) network established with funding from the National Science Foundation (NSF) EarthScope Science Program (Berglund et al., 2012;Kreemer et al., 2015). GPS sites installed by us in 2010 in the SBR and on the CP are referred to in the text and figures as EarthScope (ES) sites (Figure 2a). The expanded network is used in conjunction with the existing EarthScope PBO, MAGNET network (Blewitt et al., 2009) and Rio Grande Rift stations

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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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Analysis of Seismic Activity near Theodore Roosevelt Dam, Arizona, during the Occupation of the EarthScope/USArray Transportable Array

Cited by 3 publications

References 34 publications

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

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

Geodetic Extension Across the Southern Basin and Range and Colorado Plateau

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

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