Honors College Thesis
 

Low-frequency Teleseismic and Infrasound Arrivals along the Dense Corvallis Nodal Array

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  • The dense Corvallis array deployed in January of 2022 aided in the high-resolution study of local geology. This array was made of 177 SmartSolo 3-component 5 Hz geophones around Corvallis, with a 93 geophone profile going west towards Bald Hill for approximately 5 km at an average of 64 m apart. The Western Profile of the array crossed the inferred location of the Corvallis Fault (CFZ) on the boundary of the Coast Range and Willamette Valley. Three distant seismic events were used to investigate the subsurface geology using low-frequency p-wave arrivals. Each event arrival was bandpass filtered and each station was cross-correlated with every other station to find where rapid waveform transition occurred. Additionally, the sensors detected the distant Hunga Tonga Hunga Ha’apai eruption on January 15th, and the ensuing atmospheric Lamb wave. The Corvallis array detected these events and gave insight into the evolution of explosive submarine volcanic eruptions. The seismic CFZ was suggested to be approximately 335m east of the current mapped location and the crust on either side of the CFZ is more heterogeneous in composition than previous maps suggest, which impacts accurate seismic hazard predictions. While the primary study area was limited to Corvallis and neighboring areas, insight into the true location of the Corvallis Fault and the evolution of submarine volcanic activity was determined through distanced measurements.
  • Keywords: Seismic Array, Corvallis Fault Zone, Earthquake, Seismic Imaging, Geology, Volcanic Eruption
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