IRISSeismic: hilbert – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

hilbert

Hilbert of a seismic signal

Description

The hilbert method of Trace objects returns a Trace whose data have been replaced with the Hilbert transform of the seismic signal.

Usage

hilbert(x)

Arguments

`x`	a `Trace` object

Details

Before calculating the Hilbert transform, the seismic trace is 'cleaned up' by removing the mean, the trend and by applying a cosine taper. See DDT for more details.

Value

A Trace whose data have been replaced with the Hilbert transform of the seismic signal.

Note

This algorithm is adapted from code in the seewave package.

Author(s)

Jonathan Callahan jonathan@mazamascience.com

Examples

## Not run: 
# Open a connection to IRIS DMC webservices
iris <- new("IrisClient")

starttime <- as.POSIXct("2010-02-27 06:00:00", tz="GMT")
endtime <- as.POSIXct("2010-02-27 09:00:00", tz="GMT")

# Get the waveform
st <- getDataselect(iris,"IU","ANMO","00","BHZ",starttime,endtime)
tr <- st@traces[[1]]

# Create Hilbert transform of the trace
trh <- hilbert(tr)

# Plot signal data and hilbert data
plot(tr@data, type='l', col='gray80')
points(trh@data, type='l', col='blue')

## End(Not run)

IRISSeismic

Classes and Methods for Seismic Data Analysis

v1.6.2

GPL (>= 2)

Authors

Jonathan Callahan [aut], Rob Casey [aut], Gillian Sharer [aut, cre], Mary Templeton [aut], Chad Trabant [ctb]

Initial release