RSEIS (version 2.4-5)

JGET.seis: Reads various seismic file formats

Description

This fuction calls c-routines to read in segy, sac.

Usage

JGET.seis(fnames, kind = 1, Iendian=1, BIGLONG=FALSE , HEADONLY=FALSE,  PLOT = FALSE)
getseisinfo(fnames, kind = 1)

Arguments

fnames

list of file names.

kind

an integer 1, 2, 3; 0=R(DAT) , 1 = segy, 2 = sac, 3 = AH.

Iendian

Endian-ness of the data: 1,2,3: "little", "big", "swap". Default = 1 (little)

BIGLONG

logical, TRUE=long=8 bytes

HEADONLY

logical, TRUE= header information only; not seismic trace will be returned (runs a little faster).

PLOT

logical, for if the traces should be plotted. This is interactive and can be shut off for large data sets.

Value

• List containing the seismic data and header information. Each trace consists of a list with:
• fn
  original file name
• sta
  station name
• comp
  compnent
• dt
  delta t in seconds
• DATTIM
  time list
• yr
  year
• jd
  julian day
• mo
  month
• dom
  day of month
• hr
  hour
• mi
  minute
• sec
  sec
• msec
  milliseconds
• dt
  delta t in seconds
• t1
  time start of trace
• t2
  time end of trace
• off
  off-set
• N
  number of points in trace
• units
  units
• amp
  vector of trace values

Details

Uses readBin to extract data in SAC format. user must know what kind of machine the data was created on for I/O purposes.

If data was created on a little endian machine but is being read on big endian machine, need to call the endian "swap" for swapping.

If data was created on a machine with LONG=4 bytes, be sure to call the program with BIGLONG=FALSE.

The data returned is a list of lists, each element is one trace not necessarily related to the other traces in the list. Once the data is read in, use prepSEIS to reformat the data into a list more amenable to further analysis in RSEIS.

See examples below for different cases.

See Also

plotJGET, JSAC.seis , prepSEIS, Mine.seis

Examples

Lname = list.files(path='/data/wadati/bourbon/LaurelCanNC/R005.01' , pattern="08.005.01.41.23.9024", full.names=TRUE)

S1  = JGET.seis(Lname, kind = 1, PLOT = FALSE)

###   for data created on UNIX (SUN) but read on linux:

S1  = JGET.seis(Lname, kind = 1, Iendian="swap", BIGLONG=FALSE, PLOT = FALSE)

###   for data created on linux (32 bit)  but read on linux 64 bit:

S1  = JGET.seis(Lname, kind = 1, Iendian="little", BIGLONG=FALSE, PLOT = FALSE)

###   for SEGY data created on linux (64 bit)  but read on linux 32 bit:

S1  = JGET.seis(Lname, kind = 1, Iendian="little", BIGLONG=TRUE, PLOT = FALSE)


###   for SAC data created on MAC-OS (64 bit)  but read on linux 32 bit:

S1  = JGET.seis(Lname, kind = 2, Iendian="swap", BIGLONG=TRUE, PLOT = FALSE)


##################   



##########    to use other parts of the seismic
############               analysis package convert to rseis format:


####  prepare the data for further processing:

S1  = JGET.seis(Lname, kind = 2, Iendian="swap", BIGLONG=TRUE, PLOT = FALSE)

 GH=prepSEIS(S1)
####   plot the data, and interact with the data
PICK.GEN(GH)

###  or simply:

plotJGET(S1)