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Infrasound Workshop San Diego, USA 27-30 October 2003

Infrasound Workshop San Diego, USA 27-30 October 2003. Infrasound Processing at the IDC and its Near-term Development P. Firbas, N. Brachet International Data Centre Waveform Development and Software Integration Section Preparatory Commission for the Comprehensive

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Infrasound Workshop San Diego, USA 27-30 October 2003

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  1. Infrasound WorkshopSan Diego, USA27-30 October 2003 Infrasound Processing at the IDC and its Near-term Development P. Firbas, N. Brachet International Data Centre Waveform Development and Software Integration Section Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization Provisional Technical Secretariat Vienna International Centre P.O. Box 1200, A-1400 Vienna, Austria E-mail: Petr.Firbas@ctbto.org E-mail: Nicolas.Brachet@ctbto.org

  2. Outline of the Talk • Introduction • IDC processing - current status • Software development and tuning • Infrasound contracts in 2003 • Summary Infrasound Workshop in San Diego, USA

  3. Introduction • Follow the guidelines from CTBT/WGB/TL-2/79 (Sept2003) • Significant effort should be directed into assessment and further development of infrasound tools for analysis. It is recognized that some existing tools (e.g. PMCC) show considerable potential for forming the basis for infrasound analysis, but are not yet in a form suitable for routine operations. • Continuity with the work being accomplished • Understand the infrasound signals with station monitoring • Assess the capabilities and limitations of the current software • Propose design for enhanced automatic and interactive software at the IDC • Test and implement new tools Infrasound Workshop in San Diego, USA

  4. IDC Processing - Current Status IMS Infrasound arrays processed at the IDC (as of 22 October 2003) Operations: 11 infrasound arrays (+6 in 2003) Testbed: 16 infrasound arrays (+4 in 2003) Infrasound Workshop in San Diego, USA

  5. IDC Processing - Current Status I09, I53 I55 I22 I31 I18 I17 I24 I08 I57 I26, I10 I59 I07, I10 I33 I22, I31 I34 I17 I08 I34 I26 I24, I33 I59 I07 Infrasound Workshop in San Diego, USA

  6. IDC Processing - Current Status Types of phases contributing to infrasound automatic events (SEL3) Situation in Sept 2003 Situation in Sept 2002 Testbed 433 events 4716 events Operations 1910 events 315 events Infrasound Workshop in San Diego, USA

  7. IDC Processing - Current Status Types of phases contributing to infrasound automatic events S. hemisphere marine storms Infrasound Workshop in San Diego, USA

  8. IDC Processing - Current Status IDC OPERATIONS: 2001 SEL3 infrasound events 4 infrasound arrays 61 events IDC OPERATIONS: 2002 SEL3 infrasound events 7 infrasound arrays 461 events in 2002 Infrasound Workshop in San Diego, USA

  9. IDC Processing - Current Status IDC OPERATIONS: 2003 SEL3 infrasound events 11 infrasound arrays 1743 events IDC TESTBED: 2003 SEL3 infrasound events 16 infrasound arrays 4384 events Infrasound Workshop in San Diego, USA

  10. IDC Processing - Current Status • (Alarming) Summary about automatic infra events at the IDC • 2002 - 2003 statistics (period January-October) • 4 infrasound arrays added to the Operational IDC processing (7->11). • The number of SEL3 events multipliedby 6 (280 -> 1743). • Near Future: IDC Testbed vs Operations • 5 (4, excluding I57US) new arrays processed on Testbed (11 -> 16) • The number of SEL3 events multipliedby 2.5 (1743 -> 4384). • Long term: IDC operations using a complete IMS network • 44 infrasound arrays to be added in IDC processing • Reviewed Event Bulletin (REB) • Of 1743 SEL3 events including infrasound arrival(s), only 4 made it to the REB • 1 N. Pacific Ocean storm: 3 Infra phases (I10CA, I34MN, I59US), • 3 earthquakes: (Australia mb4.4, Algeria mb5.6, Hawaii mb4.5) 1 Infra phase Infrasound Workshop in San Diego, USA

  11. IDC Processing - Annual Overview N. Hemisphere 27 Dec 2002 14 July 2002 S. Hemisphere Infrasound Workshop in San Diego, USA

  12. IDC Processing - Weekly and Daily Overview Weekly DFX-PMCC detection bulletin at I53US Daily Libinfra/PMCC detections I53US, 2003/09/22 Infrasound Workshop in San Diego, USA

  13. I34MN, 18Jan2003 Count 45 135 180 360 90 225 0 270 315 I34MN, 18Jan2003 Count 360 180 270 45 90 225 315 135 0 Software Development and Tuning • Automatic Detection Processing • IDC Operational software: DFX-libinfra • Development and testing of DFX-PMCC software Infrasound Workshop in San Diego, USA

  14. Software Development and Tuning • Automatic Detection Processing (Cont.) • Accomplishments • Comparison of the daily detections produced by DFX-libinfra DFX-PMCC • DFX-PMCC source code modified and substantially improved • DFX-PMCC results synchronized with WinPMCC results: high level of confidence in the detection capability and quality • Baseline configuration established for DFX-PMCC • DFX-PMCC ready to be implemented and tested on real-time processing (IDC Testbed) Infrasound Workshop in San Diego, USA

  15. Software Development and Tuning • Reduce the number of bogus events related to microbaroms/surf • Identify the type of station-event based on the signal characteristics • Azimuth stability or slightly variable with time • Series of detectionsdistributed over a long time period • Frequency content on a narrow band centered around 0.15 Hz • The quality of the detections is a key factor to allow the signal identification • Example of microbaroms recorded at I34MN on January 18, 2003 • Example of surf noise recorded at I59US on October 12, 2003 Infrasound Workshop in San Diego, USA

  16. Software Development and Tuning • Automatic Global Association Processing (GA) • Decrease the number of HI bogus events(36% of total infra events) • Disable in GA the possibility of using HI seed associations (R. Le Bras) Before changes in GA After changes in GA Period 20 Sep 2003 - 8 Oct 2003 Infrasound Workshop in San Diego, USA

  17. Software Development and Tuning • Interactive Processing at the IDC • Software installation and testing at the IDC • 2001: WinPMCC (developed by DASE, France) delivered to the IDC • 2002: WinPMCC tested and validated at the IDC • Design of the future IDC interactive software for infrasound signal analysis • Use WinPMCC experience for prototyping the future IDC infrasound interactive software • Use the efficient cross-correlation/consistency algorithm • Need a 3D colored representation for the derived data (azimuth, speed, consistency ...) Infrasound Workshop in San Diego, USA

  18. Software Development and Tuning • Interactive Processing at the IDC (Cont.) • Plans for the future IDC infrasound interactive software • Continue to use ARS for infrasound interactive review • Bypass the graphic limitation of ARS introducing a new tool that has the capability of displaying 3D information (PMCC pixels) in order to review infrasound signals • Geotool window would be the best candidate to supplement ARS and support PMCC-type display • Geotool offers a good comfort for displaying color information in addition to the waveforms and arrivals. Geotool is also fully integrated with CSS database. • Geotool-PMCC would display the derived information calculated by the automatic processing (DFX-PMCC) Infrasound Workshop in San Diego, USA

  19. Automatic processing DFX-PMCC ARS Database Geotool-PMCC Software Development and Tuning Proposed Design for IDC infrasound processing Interactive processing PMCC output files Infrasound Workshop in San Diego, USA

  20. Infrasound contracts in 2003 • Request for Proposal • Establishment of an Infrasound Reference Database and Support for Enhancement of Infrasound Data Processing, Phase 1 • TOR task 2:Collection of reference events and noise • Collection of infrasonic reference event data and noise generated by a wide variety of natural and artificial sources from different regions of the world, preferably recorded using modern instrumentation similar to that used at the IMS stations, including the relevant meta-data and along with results of expert analysis. • TOR task 4:Automatic and interactive processing • Automatic and/or interactive processing of selected continuous I data (from IMS stations) provided by the IDC. • TOR task 8:Travel-time tables • Generation of seasonally (monthly), or if essential, diurnally varying and azimuth and range dependent travel-time tables for IMS I stations and relevant algorithms/software. Infrasound Workshop in San Diego, USA

  21. Infrasound contracts in 2003 • Contract with DASE (France), task 2,4 • Continuation for Year 2, signed in April 2003 • Comprehensive analysis of continuous data at I08BO (Bolivia) and I24FR (Tahiti) • Semi-annual report (task4) delivered • Contract with ANU (Australia), task 4 • Contract signed in May 2002 • Develop an advanced infrasound signal processing method using • 3D slowness-space correlator • Basic pattern recognition system for detecting regions of consistent azimuth • Noise field characterisation • Automatic and interactive processing of selected continuous infrasound data • (I07AU, I10CA, I26DE, I33MG, I34MN, I59US) • - Software and reports in final stages Infrasound Workshop in San Diego, USA

  22. Infrasound contracts in 2003 • Contract with University of Alaska Fairbanks (USA), task2 • Signed in November 2002 • Collect and process reference events at I53US (Alaska) and I55US (Antarctica) • Semi-annual report delivered • Contract with UCSD (USA), task2 • Signed in July 2003 • Collect and process reference events at I57US (California) • Contract with ISLA (Hawaii), task8 • Signed in June 2003 • Tau-P travel-time calculator, GUI interface with SAGE-RT* meteorological data from Naval Research Laboratory (NRL), USA • * SAGE-RT: Specification of the Atmosphere from the Ground to the Exosphere - real Time Infrasound Workshop in San Diego, USA

  23. Summary • IDC current and near-future objectives • WGB-TL-2/79: Given the current lack of operational analysis capability, the group recommends that no attempts should be made in the short term to include infrasound into the routine analyst review, and that the automated operational processing of infrasound data may need to be suspended. • Automatic Detection Processing: Improve the automatic detection bulletin to a high level of confidence and quality (DFX-PMCC) • Phase identification: identify phases related to known categories of long duration events (microbaroms, surf noise) and exclude them from the automatic event association • Event building: Limit building large amount of false events by configuring GA • Interactive processing: Provide the IDC analysts with a suitable infrasound specific interactive tool (Geotool-PMCC) • IDC systems configuration: [Follow WGB-TL-2/79] Suspend temporarily infrasound network processing on OPS, keep it on Testbed where DFX-PMCC will be tested Infrasound Workshop in San Diego, USA

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