Uncertainty estimates in broadband seismometer sensitivities using microseisms
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Abstract
The midband sensitivity of a seismic instrument is one of the fundamental parameters used in published station metadata. Any errors in this value can compromise amplitude estimates in otherwise high-quality data. To estimate an upper bound in the uncertainty of the midband sensitivity for modern broadband instruments, we compare daily microseism (4- to 8-s period) amplitude ratios between the vertical components of colocated broadband sensors across the IRIS/USGS (network code IU) seismic network. We find that the mean of the 145,972 daily ratios used between 2002 and 2013 is 0.9895 with a standard deviation of 0.0231. This suggests that the ratio between instruments shows a small bias and considerable scatter. We also find that these ratios follow a standard normal distribution (R 2 = 0.95442), which suggests that the midband sensitivity of an instrument has an error of no greater than ±6 % with a 99 % confidence interval. This gives an upper bound on the precision to which we know the sensitivity of a fielded instrument.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Uncertainty estimates in broadband seismometer sensitivities using microseisms |
| Series title | Journal of Seismology |
| DOI | 10.1007/s10950-014-9467-7 |
| Volume | 19 |
| Issue | 2 |
| Publication Date | October 30, 2014 |
| Year Published | 2015 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 11 p. |
| First page | 317 |
| Last page | 327 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |