io

# # The Pyrocko Developers, 21st Century # —|P——/S———-~Lg———-

# Pyrocko I/O Modules

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

• pyrocko.io.quakeml parses QuakeML (https://quake.ethz.ch/quakeml/) into a pyrocko data model.
• pyrocko.io.stationxml represents a FDSN stationXML model.

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)

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)

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)

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)

exception UnsupportedFormat(format)

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.