EarthScope Short Course 2015:
Pick Repository
Team Picks 4.0
Tiku Ravat (Kentucky)
Yenjoe Tan (Columbia)
Stefanie Whittaker (Alaska)
Yao Yao (Utah)
What is a pick and repository?
Stage 4: Finally
picking
Stage 1:finished
Figuring out
picking program
Stage 2: First round of picking
Stage 3: Fixing first rounds of picks
Why a Pick Repository?
1. Reduce redundancy of picking the same
phases of the same events for different studies
2. Understand what data goes into results e.g.
event locations, tomography…
3. Help people who are unfamiliar with
waveforms do seismology research
4. Better interface for accessing picks connect to
waveforms/events
Pick data
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Pick time
Polarity (if available)
Phase (P, pP, S, SKS, etc.)
Station code
Station channel
Network code
Filter used before picking
IRIS Event id (Origin time, Magnitude)
Author of picks (so we can give credit)
Repository Format
• csv text format: comma, space, pipe
• Name files by event time YYYYMMDD”T”HHMMSS
• Header: earthquake location, magnitude
– Dual events occurring at same time
• Sumatra instead of Fiji
• Use picks when you already have waveforms
– mseed2sac
– import picks from text file into sac header
(python)
Code for transferring data to txt and csv formats
- Matlab driver for translating submissions to standardized pick format for
distribution
- Sample output file format
-
distribution
Translate picks between catalogs
Code:
1. Search for an event from Catalog A
2. Get the matched event from Catalog B
3. Enter your picks from Catalog A that are in relative time
4. Output: picks translated to Catalog B
Output ->
Select an event or select an area
Select an event:
Select an event or select an area
Select an area:
Bottlenecks
• Getting people to put their picks online
– Give credit in papers when you use their picks
• Format conversion
– Need to provide programs to convert from
antelope to csv, SAC to csv, AQMS to csv, etc.
Conclusion
• We came up with this idea and found out IRIS
is looking to implement something like this
but not research picks.