IRISSeismic (version 1.5.1)

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

Value

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

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.

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')
# }