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4600 Rickenbacker Cswy, Miami, FL 33149
Title: Spatio-Temporal Dynamics of Earthquake Swarms in the Yellowstone Caldera
Speaker:Manuel Florez Torres
It is generally believed that earthquake swarms are driven by either aseismic slip or the migration of fluids through a preexisting fault network. However, the factors that control swarm evolution remain unclear. We present a new high-resolution earthquake catalog for the Yellowstone caldera, built using deep-learning algorithms. We detect about 4 times more earthquakes than the routine catalog and estimate precise relative earthquake hypocenters using cross-correlation differential time measurements. We perform cluster analysis to characterize the spatio-temporal dynamics of swarms in the region. Roughly 70% of the seismicity in our catalog occurs in a highly clustered mode, where punctuated episodes of hypocenter expansion and migration characterize most clusters. We perform a systematic statistical analysis to characterize swarm duration and spatial migration patterns. Our results suggest that swarms tend to migrate laterally, vertical migration is also observed, but less common.
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