pyslink2mseed

Save data for a specific seismic network/station/channel from a seedlink server. This script was originally intended to save network bandwidth of Raspberry Shakes and webservers alike. I used to transfer my data every two minutes via scp...now, thankfully, I don't. This script will save a miniSEED file every 50 seconds or so, and datestamped filenames will be created on the fly.

NB: This is NOT a replacement for Earthworm's ew2mseed program, which has significantly more built-in failover functionality and does not rely on quite so many heavy libraries to run. It simply is meant to be a placeholder for a larger and harder to set up Earthworm installation.

Installation and requirements

pyslink2mseed requires obspy, which requires Anaconda. Follow the ObsPy instructions for installing via Anaconda, then download and run this script.

Usage

Configuration is pretty straightforward. Just edit the first few lines of the pyslink2mseed.py script. If you're looking to find stations to get data from, you should take a look at the IRIS Station Map and the IRIS Metadata Aggregator.

1. Specify the server you'd like to connect to:

To connect to a Raspberry Shake on the local network, change

client_addr = 'rtserve.iris.washington.edu:18000'

to, for example,

client_addr = 'raspberryshake.local:18000'

2. Choose the stream:

If your Shake's name is RCB43 and it's a short-period instrument (SHZ), your next few lines will be as follows:

net = 'AM' # network code
sta = 'RCB43' # station name
cha = 'SHZ' # channel

3. Run the script:

Assuming you have an Anaconda environment named obspy as described in the obspy docs, you can run (from command line):

source activate obspy
python pyslink2mseed.py

That's basically it. The script will write every minute or so to a miniSEED file that looks like AM.RCB43.00.SHZ.D.2018.237 where the last two numbers are year in YYYY format and day of year in DDD format. Dates will automatically increment.

On UNIX, you can run this script in the background by specifying, for example:

python pyslink2mseed.py > /dev/null 2>&1 &

which will suppress all output.

I think it's possible to run multiple instances of this script without a problem, but I haven't tested extensively. Let me know what you find.

Bugs

• Doesn't work with certain versions of numpy. File save fails because of integer type error:

Exception: Unsupported data type int32 in Stream[0].data

Contact

Questions, comments: ian dot nesbitt at gmail dot com

Bugs, suggestions: submit an issue