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Bottlenecks: Large disk usage for saving event and continuous waveforms (up to TB or more)

Team LYF: Applying Python to Waveform Matching Detection Xin Liu (USC), Dongdong Yao(GT), Lili Feng(CU-Boulder). Motivation. Bottlenecks: Large disk usage for saving event and continuous waveforms (up to TB or more) Large potential computational cost (up to months, even years computation)

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Bottlenecks: Large disk usage for saving event and continuous waveforms (up to TB or more)

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  1. Team LYF:Applying Python toWaveform Matching DetectionXin Liu (USC), Dongdong Yao(GT), Lili Feng(CU-Boulder)

  2. Motivation Bottlenecks: • Large disk usage for saving event and continuous waveforms (up to TB or more) • Large potential computational cost (up to months, even years computation) • Quality control of the available data (Need to be done...) Proposed Solutions: • Dynamically fetcing the data and getting the result without saving tons of data • Parallel computing (mpi, gpu) • Monitoring the data quality while fetcing the data (Need to be done...)

  3. Our Goal Write a simple, concise and reusable package for detecting earthquake events and future work Use object-oriented Python and divide a big job of multiple stages to multiple classes Use IRIS FDSN web service and get stacked detection trace with a single run

  4. Work Flow select study region: • choose available earthquakes(template) • search nearby stations • determine study period sliding window cross-correlation: • fetch template waveform • predict arrivals, and compute SNR • check corresponding continuous data(hourly/daily) • operate the cross-correlation stack and output: • stack over all channels • output positive detections(MAD)

  5. Algorithm Template (35 sec): P(t) Continuous data (one day here): C(t) Correlation with template (frequency domain) Apply moving average filter F(t) (35 sec) all 1s!

  6. 35 s Waveform 1 day Correlation coefficient (CC) trace courtesy XiaofengMeng

  7. Stacked CC trace courtesy Xiaofeng Meng

  8. ClassesDesign

  9. Simple Test Event: 2015/04/12 02:23:05.15 Ohio M3.2

  10. Stacking

  11. Any question or comment? Future work • More interactive quality control of the waveforms • Utilize the parallel computing • Improve the current code (stacking, etc.) • Store detection information in SQL database

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