free SEG Y viewers


link: GSEGYView
Linux Debian, Suse, Fedora packages are available; presumably ported to Windows later. Windows version 0.1 or 0.2 is not stable.
Does not display text header correctly (as 40 lines, instead get continuous jumble). Need to define headers to sort before displaying. Amplitude scale too weak (default is man-max). Can click on trace and see headers. Shows time and amplitude under cursor. Can plot some headers (limited selection). Annotation one header.


link: Phoenix
For Windows; unzip the file and run seisvu.exe, it does not need installing. It slow to load data (tries to load all?), and is for 2D only. Default amplitude scale reasonable. Has two display modes: condensed and magnified. However magnified display parameters are difficult to adjust. Can click on trace to see headers. Shows time and amplitude under cursor. Can show amplitude statistics of trace and whole line.
Simple processing: AGC, mute, trace mix, phase shift. Can also correlate 2 traces or compute spectra. Annotation only one header (limited choice).


link: Spectrum Data
Formerly known as "Encom viewer". No longer available by download, you have to request it by e-mail. For Windows only; the executable runs without installing.
It is simple, quick to load traces, for 2D only, with good amplitude scaling. It does not display text header [correctly] with fixed font. Can click on trace to see major headers (such as FFID, CDP, line trace number) also minimum, maximum and average amplitude. Can display wiggle or density with annotation 3 headers (limited selection).


link: Flei2003
I found this in an oil industry blog years ago. Since it is a Chinese language viewer, I can't say much about it. It is for Windows.


link: IHS
Originally developed by GeoPLUS, who were apparently taken over by IHS. IHS now offer a package called PetraSeis, as well as this freeware.
This old stand-alone viewer has a nag screen, but also comes up with simple instructions. It has few display options. It shows EBCDIC header, but not binary header. It can also scan trace headers for minimum and maxium values. For Windows 98/2000/XP. The last version was in 2007.


link: Knudsen
This was made for ocean-bottom sonar profiling. It only reads integer formats. The display quality is poor. For Windows.


link: DMNG
This is not bad at all, although default amplitude scaling too hot. One can choose any header for annotation, but only shows trace under cursor. Can also display dump of sample values. Has simple processing: AGC, band-pass filter and polarity reverse. For Windows XP to 10; latest version is 2.22.5.


link: ResolveGeo
It needs key, otherwise you get demo version. After loading file in demo version, the toolbar is inactive. However, right-click on display allows some modifications. It is possible to select a region and get a spectrum. Can also produce amplituide histogram. Annotation is SP and CDP. Does not display text header correctly.
For Windows only; Version 2.0b tested. Note Resolve now market a new program named SeisShow which is considerably different.


Packages for Linux, Mac OSX and Solaris. Quite large too. It claims to read SEG Y, but this seems to be their modified variant (no reel header, like SU or BSU format).

SEGY Detective

link: Radexpro
For Windows XP/Vista/7; it runs without installing. It only displays one trace at a time. However, it displays headers with many options. It may be useful if you need to analyse a non-standard file.


link: Lynx
This is a 5-day trial for Win2000/XP/Vista. It can handle 3D, and has a good range of display options. It can display EBCDIC header, but not binary. It does not show trace headers. Trace annotation is two headers, but if you choose SP or CDP, you get same as trace number. Version 3.95 was tested. It needs to be installed in the C: partition, or else the help does not work.


link: GEOCON
This is a 15-day trial for Windows 2000/XP. It has some processing functions: BP filter, AGC, trace mix, t^n gain, and gap decon. Can display header too.


link: BYSoft
Also known as BYSeisEdit. For Windows 2000/XP: 3-month trial. It sounds impressive in the user's manual, but I could not get it to work (version 2.1)


link: Kogeo
For Windows 2000/XP only, and source code is available too. This is large package, more an interpretation workstation than a viewer. It is so not simple, but can handle 3D. It can even display time slices, if you set it up properly. There are some processing functions: AGC, filter, deconvolution, time shift, edge-preserving smoothing, coherency dip/azimuth transform, and resample. It does not display text header, something I would expect in such a program.


link: Interpex
This is refraction software for Windows with 21 day trial. So it is made for viewing shots; does not display reel header. Only shows headers relevant to refraction interpretation such as X,Y, elevation, uphole time. Can display spectrum. Simple processing: band-pass, f-k filter, integrate, differentiate, debias.


Russian freeware for Windows, but not useful on English-language system. Geospline's website is no more, but it can be found via or look for in

Seismic Viewer

link: Summit
This is demo version, it has nag screen and watermark. For Windows XP/2003/Vista. The cursor gives time and amplitude (in volts). Simple processing: AGC, bandpass or notch filter. It only offers wiggle or wiggle+VA. It seems to drop traces, for example with 2800 traces, it dislayed every 5th. Does not display headers.

Front End

link: Geogiga
This is part of a package, and it is only suitable for displaying shot records. It includes gain functions, such as exponential and AGC. The "divergence correction" appears to zero the data instead. Does not display reel headers (and trace header only shot, X and Y) It is for Windows NT/2000/XP/Vista.


link: Dalhousie
This works with Windows NT/2000/XP. It was developed by a research group for their particular project, and is awkward to use. It expects data to be little-endian. It has a unix-PC conversion, which does not work always. It also has an "Info" function, which does not work well. It can give you a spectrum for a single trace. Trace annotation is several headers: trace, FFID, SP, CDP, X, Y and offset (all or nothing). Has a range of processing functions: debias, deconvolution, filter, normalise, time-power gain, and others, which require a velocity function. It was last updated in 2003.


link: Geoscitech
It is also known as Spectrum Result Viewer. It is for Windows , and requires registration to download. This was designed for viewing output of a special program, and it is not useful as a general SEG Y viewer. It has error "too large bitmap" most of the time.


link: Statcom
Works with Windows 98/Me/NT/2000/XP. Trace header display shows both 2 and 4-bytes version, numeric only - no header names Trace display: wiggle or VAW only monochrome. Annotation - 3 headers top and bottom Amplitude scaling automatic, can be adjusted. Comes with 7-page instruction document.


link: Geopsy
For Linux (source), Mac and Windows. It was written for ambient seismic recording, so is not so useful for reflection seismic data. Plots only VA wiggle, so suitable only for less than 100 traces. Can show spectra (with logarithmic frequency scale).


link: Scadaos
Available for Linux (Redhat or Ubuntu). It is a demo version - only 2D and monochrome display. Data must be scanned before displaying, so several mouse clicks are needed.


Was made by a company called Seismsoft, which is no more. I only managed to download the initial release, which was a 19-day demo for Windows. It was awful. I also came across something with the same name in a programmer's forum, but could not download it.


link: Ismar
This is described as an interactive interpretation/processing program, which reads SEG Y files. It sounds useful, unfortunately I only get a blank rectangle when I try to load anything. Also it does not display the text header correctly.


link: ITG
It is apparently taken from a larger package. This free version has some features disabled, but unfortunately changing display options is one of them. If that were possible, it might be useful, as it can display gathers and stacks. Also it seems to be a bit slower than some of others listed above. For Windows and Mac.

GPRSoft Viewer

link: Geoscanners
For Windows XP/Vista/7/8. This is intended for displaying GPR data, and it includes SEG Y as one of the formats. Has limited display options.

GPR Viewer Plus

Another Windows GPR viewer that claims to support SEG Y, but when I tried to open some files, it protested invalid format. Probably a little/big endian mixup.


link: SeismiGraphix
This is in Java, so runs under most operating systems. It takes several mouse clicks to load a file, but is worth it. Displays headers and has AGC option. Currently a beta release and I expect it will get more features in future.

compiled by Michael Seman 2016