The WebDC3 (EIDA data access portal) allows download of time series data in Full SEED and Mini-SEED formats only. Guidelines and examples for SEED data reading and conversion are given here.
Mini-SEED data can be read in Matlab by means of a variety of scripts prepared by Matlab users and available on the Web. One example is the miniSeedToolbox, that uses the IRIS libmseed library to read and write Mini-SEED formatted files in Matlab. If Matlab and the miniSeedToolbox are properly installed on your computer, this sample script can be used as a starting point for reading and displaying Mini-SEED data files.
A powerful tool for Mini-SEED data visualisation and basic processing is PQLII, free software available from IRIS Passcal. Further, the reader is invited to evaluate the variety of free software resources provided by Passcal here.
Other free software tools that can deal with Mini-SEED are Geopsy and Obspy.
As to data conversion, the reader is referred to the exhaustive list of tools provided by ORFEUS and IRIS.This list includes software packages for conversion from Mini-SEED to ascii and SAC, the standard package for seismic data processing in many regions, in particular the US.
In particular, rdseed can be used to convert SEED volumes into SAC compatible data.
As exhaustively documented in the rdseed manual, several options can be used when reading SEED volumes. In particular, the
-d read data from tape
option can be used to read the waveforms from full SEED data and subsequently convert into different formats:
-o specify output format (1=SAC, 2=AH, 3=CSS, 4=miniSEED, 5=SEED [default=1])
When Mini-SEED data are used, the user should specify that station configuration and responses be taken from another SEED volume, for example a data-less SEED volume. The environment variable ALT_RESPONSE_FILE should be defined with its value being the path name of the SEED volume (be it full or data-less SEED) from which responses should be taken. If Mini-SEED is being used, enter the Mini-SEED file name into the rdseed prompt as you would a normal seed volume, as following:
rdseed -d -f yourminiseedfile -o 1 -g yourdatalessfile
The following files can be used as 'fake' data-less for rapid conversion into sac:
The user should modify the station and network name using e.g. PDCC.
Note on start/end time of the requested waveforms
Users might be interested in processing waveform data with start and end time that exactly match the start / end time of the requested time windows. Time sichronisation tipically does not occur automatically because - as SEED format is block-oriented - it is possible to have incomplete blocks in the waveforms retrieved from ArcLink.
One possibility is to sychronise the waveforms later in SAC, using the SYNCHRONIZE command.
Another possibility is to fill in the incomplete blocks with padding, so that the data starts and ends as close as possible to the specified time. qmerge for example has an option -T: Exact trim -- trim data to closest specified time. Default is to trim to nearest inclusive block boundary.