Go to the list of seismic processes.
Go to SIOSEIS introduction.
SIOSEIS is a computer system for enhancing and manipulating marine
seismic reflection and refraction data, sponsored by the National
Science Foundation (NSF) and the Scripps Industrial Associates.
The system currently runs on SUN, SGI, PC-Linux, PC-CYGWIN, and Mac OSX.
X11 and an Unix shell are also required.
SIOSEIS features the use of the geophysical industry standard
demultiplexed SEG-Y data format for tape and disk files. Seismic record
sections may be produced directly to a raster plotter without creating
intermediate files or making additional computer runs. The processing
variables are given by the user via free field named parameters and are
edited for possible errors before any data are processed. The system was
designed for use by people with some training in applied geophysics.
Users must know how to use a text editor and use a Unix shell.
SIOSEIS has three features that are particularly useful for processing
The use of a shell script (parameter file) enables complex jobs to
be changed and rerun with minimal typing. Parameter files also
allow easy modification so that ALL seismic lines within a project
- Most academic seismic lines are collected over uneven bathymetry.
SIOSEIS has the unique ability to define the water bottom, then
having a single set of parameters for NMO, mute, decon, etc.
reference the water bottom time automatically. This results in an
enormous time saving over having to define a new parameter each
time there is a major variation in water depth.
- Marine geophysicists often collect data in very deep water, using a
delay to reduce the quantity of data actually recorded. This
results in the time of the first data sample being a time other
than zero. In SIOSEIS each process that uses time as a variable
honors the deep water delay. SIOSEIS processes do not remove the
delay by padding with zeroes to force the first time to be zero and
adding to the amount of data processed. The use of the deep water
delay greatly increases the speed of processing.
- SIOSEIS has a unique user interface. All user variables are
described via free field, order independent, named parameters. The
processing order is controlled by a single statement regardless of
the order of the processing variables. Very long multichannel lines
may be described in full, yet can be processed in small pieces. The
program never generates large disk files with processing tables,
rather it generates the appropriate information as the data are
SIOSEIS has been under development at Scripps Institution of
Oceanography (SIO) since 1978 and has been used by scientists,
students, and staff to process multi-channel and one and two
channel reflection and refraction data. The system has been used
for production processing as well as experimental work with
expanding spreads, OBS (ocean bottom seismometers), sonobuoys,
ESP (expanding spread profiles), and WAP (wide angle profiles);
with sample intervals ranging from 8 milliseconds to .1 milli-
second and "unusual" sample rates of 128 samples per second.
The list of seismic processes available is contained in the users' manual.
For further information and code availability, contact firstname.lastname@example.org
Some differences between SIOSEIS and some other seismic packages are:
- Use of the deep water delay.
- Allowing the trace length, sample interval, and deep water delay
to vary from trace to trace.
- SIOSEIS keeps the data in SEG-Y and does not use an internal data
- SIOSEIS runs on all Unix workstations.
- SIOSEIS is issued as a site license, permitting all machines to do
- There are drivers for all raster plotters, thus additional plotting
packages are not necessary. SIOSEIS can make "seismic wallpaper"
- SIOSEIS can read SEG-D tape and disk files.
- Most SIOSEIS processes allow time parameters to be "hung" from
the water bottom time in the SEG-Y trace header. E.G. processes
gain, mute, decon, and nmo reference the water bottom time.
- SIOSEIS has some special techniques for handling refraction
- SIOSEIS's geometry is done completely in floating point which allows
the subsurface binning to be defined with non-integers.
- Realtime or near realtime processing is possible if the velocity
function can be described as a function of water depth.
- SIOSEIS can process data without building any external database
files. This allows quick access to any shot.