Temporal and Spatial Variation in Ambient Seismic Noise in the Charleston Region
| dc.contributor.advisor | Jaume, Steven | |
| dc.contributor.author | Cobb, Savannah E | |
| dc.date.accessioned | 2022-03-25T17:34:28Z | |
| dc.date.available | 2022-03-25T17:34:28Z | |
| dc.date.created | 2016-08 | |
| dc.date.submitted | August 2016 | |
| dc.description.abstract | Charleston has a high earthquake hazard, and understanding site response in the region is important for earthquake preparedness. Previous studies have revealed a 1-3 Hz peak in horizontal-to-vertical spectral ratios (HVSRs) on the Charleston peninsula. These studies also found that the amplitude of this response varies with surface geology and, at a few locations, with time of day. The objective of this study is to study the spatial and temporal variation of the 1-3 Hz peak amplitude in Charleston using recently acquired seismic data. In Summer 2015, the United States Geological Survey (USGS) recorded up to 7 hours of daytime ambient seismic noise from ten arrays of up nine to ten Nanometrics Trillium Compact seismometers placed throughout the Charleston region. I computed HVSRs using 1-hour-long time segments when all seismometers in an array were recording. I analyzed variation in HVSRs by hour and by station to determine if spatial variation or temporal variation in the amplitude of the 1-3 Hz peak was more significant. I found that spatial variation in ambient seismic noise was consistently much greater than temporal variation in ambient seismic noise for all stations. Therefore, the observed spatial variation in the 1-3 Hz HVSRs from this and the previous studies is a robust observation relatively unaffected by the time of day when data were collected. | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | https://repository.library.cofc.edu/handle/123456789/5062 | |
| dc.language.iso | en_US | |
| dc.subject | Charleston, seismic noise, seismology, spatial, temporal, variation, earthquake, seismicity, ambient seismic noise | |
| dc.title | Temporal and Spatial Variation in Ambient Seismic Noise in the Charleston Region | |
| dc.type.genre | thesis | |
| dc.type.material | text | |
| thesis.degree.department | Geology | |
| thesis.degree.discipline | Geology | |
| thesis.degree.grantor | College of Charleston | |
| thesis.degree.name | Bachelor of Science |