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Analysis of 2011 Circleville, Utah Earthquake Sequence

Explore the location, source, and aftermath of the January 2011 Circleville, Utah earthquake series. This study investigates the mainshock, aftershocks, and seismic patterns using advanced relocations and focal mechanism solutions. Understand the geological implications and correlations with local fault systems.

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Analysis of 2011 Circleville, Utah Earthquake Sequence

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  1. Christine Gammans Location and Source Analysis of the January 2011 Circleville, Utah Earthquake Sequence

  2. Introduction • Began January 3, 2011 • Mw4.7 mainshock • ̴98 aftershocks • Portable station deployed • Captured a large aftershock within one focal depth

  3. Methods • Master Event relocations • hypoDD relocations (Waldhauser and Ellsworth, 2000) • Moment Tensors and their focal mechanism solutions (Minson and Dreger, 2008) • Extrapolation of moment tensor based on station’s amplitude amplification factors (AAF)(Tan and Helmberger, 2007)

  4. Issues and Expected Results • Strike-slip and normal focal mechanisms • Low angle faults • Station coverage • Seismic events confined to planes • Similar magnitudes for first and second principal stress axes • Correlate to local geology

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