hfsnm {psd}

Noise levels found in PBO strainmeter data at seismic frequencies.

Description

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.

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.

Details

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

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

See Also

pspectrum, Tohoku, magnet

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]))