hfsnm dataset

Noise levels found in PBO strainmeter data at seismic frequencies.

These values represent noise levels in high frequency data ( $10^{-3} - 10$ Hz) from 2009, averaged over all stations in the Anza cluster of the Plate Boundary Observatory (PBO) borehole strainmeter network, and the UCSD-style longbase laser strainmeters. data

Format

A dataframe with 141 observations on the following 4 variables:

freq: Frequencies, in Hertz.
P50: The 50th percentile (median) noise levels in decibels relative to $1 \epsilon^2 /$ Hz.
P10: The 10th percentile noise levels also in decibels.
meter.type: The strainmeter design type.

and 2 attributes:

source.doi: The DOI number of the source publication.
generator: The structure of a function which will refresh the values from the supplemental files of the original publication.

Source

Barbour, A. J., and Agnew, D. C. (2011), Noise Levels on Plate Boundary Observatory Borehole Strainmeters in Southern California, Bulletin of the Seismological Society of America, 101 (5), 2453-2466, doi:10.1785/0120110062

Details

NA values in the series highlight frequency bands where the noise levels are unreliable, due to a instrumental artifact.

Examples


data(hfsnm)
str(hfsnm)
FUN <- attr(hfsnm, "generator")
try(dat <- FUN(molten=FALSE)) # may fail without library-access to BSSA
try(all.equal(dat[,1:4], hfsnm[,1:4]))