io

Input and output of seismic traces.

This module provides a simple unified interface to load and save traces to a few different file formats. The data model used for the pyrocko.trace.Trace objects in Pyrocko is most closely matched by the Mini-SEED file format. However, a difference is, that Mini-SEED limits the length of the network, station, location, and channel codes to 2, 5, 2, and 3 characters, respectively.

Seismic Waveform IO

format

format identifier

load

save

note

Mini-SEED

mseed

yes

yes

SAC

sac

yes

yes

1

SEG Y rev1

segy

some

SEISAN

seisan, seisan.l, seisan.b

yes

2

KAN

kan

yes

3

YAFF

yaff

yes

yes

4

ASCII Table

text

yes

5

GSE1

gse1

some

GSE2

gse2

some

DATACUBE

datacube

yes

SUDS

suds

some

CSS

css

yes

Metadata IO

Notes

1

For SAC files, the endianness is guessed. Additional header information is stored in the Trace’s meta attribute.

2

Seisan waveform files can be in little (seisan.l) or big endian (seisan.b) format. seisan currently is an alias for seisan.l.

3

The KAN file format has only been seen once by the author, and support for it may be removed again.

4

YAFF is an in-house, experimental file format, which should not be released into the wild.

5

ASCII tables with two columns (time and amplitude) are output - meta information will be lost.

load(filename, format='mseed', getdata=True, substitutions=None)[source]

Load traces from file.

Parameters
  • format – format of the file ('detect', 'from_extension', 'mseed', 'sac', 'segy', 'seisan', 'seisan.l', 'seisan.b', 'kan', 'yaff', 'gse1', 'gse2', 'gcf', 'datacube', 'suds', 'css')

  • getdata – if True (the default), read data, otherwise only read traces metadata

  • substitutions – dict with substitutions to be applied to the traces metadata

Returns

list of loaded traces

When format is set to 'detect', the file type is guessed from the first 512 bytes of the file. Only Mini-SEED, SAC, GSE1, and YAFF format are detected. When format is set to 'from_extension', the filename extension is used to decide what format should be assumed. The filename extensions considered are (matching is case insensitive): '.sac', '.kan', '.sgy', '.segy', '.yaff', everything else is assumed to be in Mini-SEED format.

This function calls iload() and aggregates the loaded traces in a list.

iload(filename, format='mseed', getdata=True, substitutions=None)[source]

Load traces from file (iterator version).

This function works like load(), but returns an iterator which yields the loaded traces.

save(traces, filename_template, format='mseed', additional={}, stations=None, overwrite=True, **kwargs)[source]

Save traces to file(s).

Parameters
  • traces – a trace or an iterable of traces to store

  • filename_template – filename template with placeholders for trace metadata. Uses normal python ‘%(placeholder)s’ string templates. The following placeholders are considered: network, station, location, channel, tmin (time of first sample), tmax (time of last sample), tmin_ms, tmax_ms, tmin_us, tmax_us. The versions with ‘_ms’ include milliseconds, the versions with ‘_us’ include microseconds.

  • format'mseed', 'sac', 'text', 'yaff', 'gse2'

  • additional – dict with custom template placeholder fillins.

  • overwrite' – if False, raise an exception if file exists

Returns

list of generated filenames

Note

Network, station, location, and channel codes may be silently truncated to file format specific maximum lengthes.

exception UnknownFormat(filename)[source]
exception UnsupportedFormat(format)[source]

Available IO Modules

pyrocko.io.io_common

pyrocko.io.css

pyrocko.io.datacube

pyrocko.io.enhanced_sacpz

pyrocko.io.gcf

pyrocko.io.gse1

pyrocko.io.gse2

pyrocko.io.ims

Module to read and write GSE2.0, GSE2.1, and IMS1.0 files.

pyrocko.io.kan

pyrocko.io.mseed

pyrocko.io.quakeml

pyrocko.io.rdseed

pyrocko.io.resp

pyrocko.io.sac

SAC IO library for Python

pyrocko.io.segy

pyrocko.io.seisan_response

pyrocko.io.seisan_waveform

pyrocko.io.stationxml

pyrocko.io.suds

pyrocko.io.yaff

File IO module for SICK traces format.