IRISSeismic (version 1.6.6)

Trace-class: Class "Trace"

Description

A Trace object containing a seismic trace -- a continuous timeseries.

Objects from the Class

Objects occupy the traces slot of a Stream-class object and are typically populated by calls to getDataselect.

Slots

id:

Object of class "character": Unique "SNCL" identifier specifying the Network, Station, Location, Channel and Quality factor associated with this trace: eg. AK.PIN..VEA.M. The id is generated automatically when the trace is first created and is intended for read only.

Sensor:

Object of class "character": Instrument name.

InstrumentSensitivity:

Object of class "numeric": The total sensitivity for a channel, representing the complete acquisition system expressed as a scalar. Equivalent to SEED stage 0 gain.

SensitivityFrequency:

Object of class "numeric": The frequency at which the total sensitivity is correct.

InputUnits:

Object of class "character": The units of the data as input from the perspective of data acquisition. After correcting data for this response, these would be the resulting units.

stats:

Object of class "TraceHeader": Container with metadata information describing the trace. (see TraceHeader-class)

data:

Object of class "numeric": Vector of data values.

Methods

as.vector

signature(x="Trace"): returns the data slot; equivalent to x@data

DDT

signature(x="Trace", demean="logical", detrend="logical", taper="numeric"): returns a new trace that has been 'cleaned up' for further processing by applying demean, detrend, and taper techniques (see DDT)

envelope

signature(x="Trace"): returns the envelope of the seismic signal (see envelope)

isDC

signature(x="Trace"): returns TRUE if trace data consist of a DC signal

length

signature(x="Trace"): returns the length of the data; equivalent to length(x@data)

max

signature(x="Trace"): returns the maximum value of the data; equivalent to max(x@data)

median

signature(x="Trace", na.rm="logical"): returns the median value of the data; equivalent to median(x@data)

mean

signature(x="Trace"): returns the mean value of the data; equivalent to mean(x@data)

min

signature(x="Trace"): returns the minimum value of the data; equivalent to min(x@data)

multiplyBy

signature(x="Trace", y="numeric"): returns a new Trace where the data have been multiplied by y (see multiplyBy)

plot

signature(x="Trace"): default plot of the Trace data with appropriate labeling

rms

signature(x="Trace"): returns the Root Mean Square amplitude of the data (see rms)

rmsVariance

signature(x="Trace"): returns the RMS variance of the data (see rmsVariance)

sd

signature(x="Trace", na.rm="logical"): returns the standard deviation of the data; equivalent to sd(x@data)

slice

signature(x="Trace", starttime="POSIXct", endtime="POSIXct"): returns a new Trace subset of an existing Trace (see slice)

STALTA

signature(x="Trace",staSecs="numeric",ltaSecs="numeric",algorithm="character", ...): returns the STALTA picker result (see STALTA)

triggerOnset

signature(x="Trace", picker="numeric", threshold="numeric", ...): returns the time or index of an event onset as determined by the STALTA picker (see triggerOnset)

Author

Jonathan Callahan

Examples

if (FALSE) {
# Open a connection to IRIS DMC webservices
iris <- new("IrisClient")

# Set the starttime and endtime
starttime <- as.POSIXct("2012-01-24", tz="GMT")
endtime <- as.POSIXct("2012-01-25", tz="GMT")

# Get the waveform
st <- getDataselect(iris,"AK","PIN","","BHZ",starttime,endtime)

# Get the first trace and generate some statistics
tr1 <- st@traces[[1]]
min(tr1)
median(tr1)
mean(tr1)
max(tr1)
sd(tr1)
rms(tr1)
rmsVariance(tr1)
}