Mini-SEED Fundamentals

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Presentation transcript:

Converting Waveform Data to Mini-SEED

Mini-SEED Fundamentals Mini-SEED is a bare time series only format designed for exchange and archiving of seismological data. Data samples: integer and IEEE floats Compression for integer samples Basic state of health fields No analysis or user-defined variables * Mini-SEED is not designed as an analysis format!

Finding Converters http://www.orfeus-eu.org/Software/conversion.html http://www.iris.edu/pub/programs/converters/ http://www.passcal.nmt.edu/content/software-resources

Existing Mini-SEED Converters From Format Program GSE gse2mseed [IRIS DMC], gse2seed (INT only) [ORFEUS] SAC sac2mseed [IRIS DMC], sac2ms [NCEDC] SeisAn seisan2mseed [IRIS DMC], SeisAn supports Mini-SEED MARS 88/lite mars2mseed [IRIS DMC] Reftek ref2mseed, rt2ms [IRIS PASSCAL] SEGY segy2mseed [IRIS PASSCAL], segy2ms [NCEDC] SEED rdseed [IRIS DMC]

Waveform Conversion Warnings Loss of header information due to incomplete format mapping Loss of data sample precision due to sample format changes Rule of thumb: convert waveform data as few times as possible

Programming Resources libmseed – A Mini-SEED library in C http://www.iris.edu/pub/programs/ qlib2 – A Quanterra Users Group library http://www.ncedc.org/qug/software/ucb/

libmseed – Mini-SEED Programming Allows reading and writing of Mini-SEED records Written in C Supports all structures of SEED 2.4 with a few minor caveats (blockette 2000 and blockette 405) Supports all valid record lengths and big or little endian Supports ASCII, int-16, int-32, float-32, float-64, Steim-1 and Steim-2 encoding formats for reading and writing (older encodings read-only) Manages arbitrarily long continuous trace segments and groups of continuous trace segments composed, for example, of many Mini-SEED records Tested on Solaris, Linux, Mac OSX and MS-Windows Available from: http://www.iris.edu/pub/programs/

Mini-SEED Handling Tools msi - Mini-SEED Inspector Parse and print useful information about Mini-SEED in one or many files. Including continuous segment construction, data sample printing, etc. dataselect - Mini-SEED Data Selection Subset, reorder and prune overlap for arbitrary sets of Mini-SEED http://www.iris.edu/pub/programs/miniseed/ Many, many other Mini-SEED tools exist and are freely available.