Seisvault opens SEG-Y seismic files on your iPhone and iPad and shows you exactly what is in them: the textual and binary headers, every trace header, and the traces themselves as wiggle, variable-area or variable-density sections. Everything runs on the device.
READS YOUR FILES
- SEG-Y revision 0, 1 and 2
- 3200-byte textual header in EBCDIC or ASCII, plus extended textual headers
- 400-byte binary header, including revision 2 extended sample count, sample interval and first-trace offset
- 240-byte trace headers, with coordinate and elevation scalars applied
- Big-endian or little-endian, detected automatically
- Sample formats: 4-byte IBM float, 4- and 8-byte IEEE float, and 8, 16, 24, 32 and 64-bit signed or unsigned integers
- Fixed or variable trace lengths; large files are memory-mapped so only the traces you view are read
DISPLAY
- Wiggle, wiggle plus variable area, variable area, or variable density in grey, red-white-blue or black-white-red
- Gain, percentile clip, AGC with adjustable window, trace balance and polarity reversal
- Trace spacing, time scale and pinch zoom; time axis and trace labels from any header (CDP, inline, shotpoint and more)
- Show a range of traces, every Nth trace, or all traces with a chosen header value, such as one inline of a 3D volume or one shot gather
- Tap a trace to see its waveform, statistics and key header values
HEADERS AND QC
- Textual header viewer with selectable text
- Binary header table with byte positions and decoded codes
- Trace header browser for every standard field, searchable by name, key or byte
- File checks: byte order, revision, sample format, sample interval and length consistency, trace numbering, coordinate scalars, blank coordinates, dead traces, NaN or zero amplitudes, 3D grid fill
- Header plots and min/max ranges across the whole file
- Amplitude statistics and average amplitude spectrum with dominant frequency
EXPORT
- Section image (PNG)
- QC report (PDF)
- Trace headers and samples (CSV), textual header (TXT), binary header (CSV)
- Displayed traces written as a new SEG-Y file in big-endian IEEE float (revision 1), headers preserved
GETTING FILES IN
Open files from the Files app, share them to Seisvault from another app, or copy them into On My iPhone > Seisvault. A synthetic demo line generated on the device lets you try every feature without your own data; it is clearly labelled as synthetic.
ONE PURCHASE, PRIVATE
- Everything is included in the download: no subscription, no in-app purchases
- No account, advertising, analytics or tracking
- Works offline; files leave the device only when you export or share them
Seisvault is a viewer and QC tool, not an interpretation or processing package. Confirm geometry, coordinate reference systems and processing history independently.
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