Infrasound Workshop De Bilt, Netherlands 28-31 October 2002 Infrasound Processing at the IDC and its Near-term Development Petr Firbas International Data

Infrasound WorkshopDe Bilt, Netherlands28-31 October 2002

Infrasound Processing at the IDC and its Near-term Development

Petr FirbasInternational Data Centre/Waveform Integration

Preparatory Commission for the ComprehensiveNuclear-Test-Ban Treaty OrganizationProvisional Technical SecretariatVienna International CentreP.O. Box 1200, A-1400 Vienna, AustriaE-mail: [email protected]

Infrasound Workshop in De Bilt, Netherlands 28-31 October 2002 Page 2

Outline of the talk

Overview of infrasound Processing at the IDC

Automatic data processing in Operations an testbed

Development and testing at the IDC

• WinPMCC testing

• Infrasound contracts

• IDC infrasound reference database

• Weekly detection bulletins

Strategy to be discussed

• Bulletin issues

• Future design of the IDC software


Status of infrasound processing at the IDC

Basic Processing steps at the IDC

• Data acquisition and forwarding

• Signal processing (DFX)

• Phase identification (StaPro)

• Network processing (GA, EvLoc) for SHI data

• Interactive processing (ARS)

• Post processing (incl. event screening)

• Product distribution (subscriptions, AutoDRM, WEB)

• Archiving


Status of infrasound processing at the IDC

Inputs:Inputs:

Outputs:Outputs:

Raw Data (archived and accessible as soon as it arrives)

Time after Event Occurrence

12 hrs6 hrs2 hrs <10 days

AutomaticStandardEvent List

2

Infra-sound

AuxiliarySeismic


3

ReviewedReviewed& Standard& Standard

Event BulletinsEvent Bulletins

AnalystAnalystReviewReview

Automatic Radnuc.Report

Radionuclide

AnalystAnalystReviewReview

ReviewedReviewedAtm.Atm.

Radnuc.Radnuc.Meas.Meas.ReportReport

Fused EventBulletin &Executive

Summaries(daily)

ConceptualFEB and ES production

Seismic Hydro-acoustic


1

AutomaticFissionProduct

Screening

FissionFissionProductProductEventEvent

BulletinBulletin

AutomaticStandardScreened

EventBulletin

AutomaticSHI

EventScreening


Infrasound stations processed at the IDCas of October 2002

19-Aug-2001 (tbd)

25-Nov-2001 (ops)

18-Jan-2002 (tbd)

4-Mar-2002 (ops)

27-Sep-2001 (tbd)

2-Dec-2001 (ops)

2-Apr-2001 (tbd)

11-Oct-2001 (ops)1-Sep-2001 (tbd)

15-Oct-2001 (ops)

5-Sep-2002 (tbd)

16-Aug-2002 (tbd) 3-Dec-2001 (tbd)

29-Jul-2002 (tbd)


Automatic Data Processing

Number of SEL3 events with infrasound arrivals

I26,

I10

I07,

I10

I34

I34 I0

7I3

3

I26

I59

I59

I57 I0

8 I24

idc3.0.58 idc3.0.62


Automatic Data Processing

Type of phases contributing to infrasound automatic events

I07AU, I33MG, I08BO


Comparison of Automatic Ops/Testbed Processing

IDC TESTBEDSEL3 infrasound events

9 infrasound arrays

587 events between Oct2001 and Oct2002

IDC TESTBED

SEL3 infrasound events

5 infrasound arrays

341 events between Oct2001 and Oct2002

IDC OPERATIONS

Purely infra eventsSHI events

Purely infra eventsSHI events



Objective

Understand the infrasound signals, assess the capabilities and limitations of the current software, propose design of enhanced IDC software.

• Automatic processing

• Station monitoring

Data quality check, Detection & event statistics, Problem report

• Activation of DFX-PMCC in test mode for detection comparison

• Software assessment and update

R3 patches, Bug reports, Parameter configuration changes, Designing software enhancements

• Interactive processing

Install WinPMCC on testbed for interactive review of the infrasound signals



Objective (cont.)

• Knowledge build-up

• Create benchmarks for detection and event processing tuning

• Build a catalogue of reference event database for the IDC analysts

(on contractual basis; voluntary contributions are welcome)

• Training (internal/external) of IDC analysts (who actively participate in station data evaluation and software testing)

• Gain experience in multi-technology processing


WinPMCC testing

Objective• Install and assess a new tool for interactive infrasound analysis: WinPMCC• Familiarize with new techniques of signal analysis (correlation, 3D display)• Review and identify relevant infrasound signals at IMS stations

Timeline• Phase1: Apr 2001 - Jun 2002: Adapt WinPMCC to IDC environment

• Cooperative work between DASE (France) and IDC • Several versions of WinPMCC delivered, installed and tested at the IDC• First assessment of WinPMCC (incl. IDC infrasound reference events) • Installation of WinPMCC on IDC testbed

• Phase2: Jul - Aug 2002: WinPMCC testing by IDC analysts• Joint exercise between IDC Sections (Monitoring and Waveform Development)• Several days of continuous data reviewed in detail for 4 IMS infrasound arrays

(I0AU, I10CA, I26DE, I34MN)

• Special event analysis (e.g. Canadian bolide, typhoon Japanese coast)


WinPMCC testing

Achievements• Adapted and installed a new interactive tool running on IDC testbed

• Positive experience of the IDC analysts using WinPMCC• Increased interest for Infrasonic method

• Provided a list of recommendations for software design and enhancements

• Opened new perspectives for interactive/automatic infra data processing• Demonstrated the efficiency of the cross-correlation/consistency algorithm

• Introduced 3-Dimension representation - found very valuable

Conclusions• WinPMCC is an innovative powerful tool for interactive analysis of infrasound events

• WinPMCC helps reviewing automatic detections and facilitates tuning the

automatic processing


Infrasound contracts in 2002

RFP submitted by IDC for year 2002• 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 6: Automatic and interactive processing Collection of information on signal propagation effects (travel-time, attenuation and dominant signal frequency

as a function of range, azimuth, phase type, source position and receiver position, including upper atmospheric

winds and temperature structure, multipathing, multiple surface reflections, season (month) of the year and time

of the day, etc.) of I waves recorded at the IMS stations; Assessment and/or validation of I wave propagation

models and/or travel-times used at the IDC and proposals for their improvement; prototype software for long-

distance signal propagation modelling.


Infrasound contracts in 2002

RFP submitted by IDC for year 2002 (cont.)

• TOR task 8: Travel-time tablesGeneration of seasonally (monthly), or if essential, diurnally varying and azimuth and range dependent travel-time tables for IMS I stations and relevant algorithms/software.

• TOR task 9: Synergy between SHI dataCollection of reference events which demonstrate possible synergies (location accuracy, source type identification, etc.) between H, I and S data

• TOR task 10: Training of IDC staffTraining of IDC staff on I data processing by experienced I experts


Infrasound contracts in 2002 - Status

• Contract signed with DASE (France)Delivered– Delivery of semi-annual reports for task 2 and task 4 (July 2002)– Details on ~100 events analysed on 3 infra stations (I24FR, I25FR, Flers)– Comprehensive analysis of two days of bulletin at I34MN and I33MG– CSS Waveforms and results provided

Expected soon…– Annual report on task 9– Training for IDC staff (task 10)

• Contract signed with ANU (Australia), task 4– 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)


Infrasound contracts in 2002 - Status

• Contract signed with University of Alaska Fairbanks, task2– Collect reference events at Fairbanks and Windless Bight– Project just started

• Other contracts awaiting to be signed


IDC infrasound reference event database

ObjectiveCollection 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, task2).

• Knowledge database for IDC analysts cataloguing• Infrasound signals of interest• Station characteristics

• Build a detection and event benchmark for testing infrasound software

TimelineStarted in 2001, ongoing

Participants• Cooperative work between IDC Sections (Monitoring and Waveform Development)• On contractual basis; voluntary contributions are welcome


IDC infrasound reference event database

Achievements• Collection of infrasound events of special interest (around 20)

Mine, hurricane, bolide and meteorite, earthquake, missile test, volcano,

thunderstorm, surf noise• Known events detected (positive information)• Known events not detected (negative information)

• Initial evaluation of the delivery from DASE contract

Future plans• Continue the special event analysis (targets of opportunity)

• Store reference events provided by DASE and other future contractors in the reference database along with meta-data

• Utilize common IDC database structure being developed for IDC calibration program


Weekly detection bulletins

Weekly detection bulletins

• are produced for all infrasound arrays

• are updated automatically on a daily basis

• display DFX-libinfra & DFX-PMCC results

• display detections associated to SEL3 events

Detections at I07AU(DFX-PMCC)


Association issues - Strategy to be discussed

What should be the event definition at the IDC?

• Type of events to be detected and to be reported in the IDC bulletins?

• Long duration phenomena: microbaroms, volcano eruptions, surf noise ...

• High frequency short duration: quarry blasts, military exercise…

• Seismic phases from shallow earthquakes

• Tag long-duration detections to limit their impact on network processing?


• Should IDC process infrasound differently from S & H technologies?

Generate station detection bulletins

• Only 2 REB events (1 mine, 1 earthquake) contain infrasound arrival in 1 year of IDC processing!

• Increase of automatic SEL3 events with the number of IMS stations may cause problems in the future

• Should IDC process infrasound independently from S & H technologies?

Separate infrasound pipeline from the other technologies, and merge SHI bulletin at a later stage?

DFX/S

DFX/H

DFX/I

GA/SHI

DFX/S

DFX/H

DFX/I

GA/SH

GA/IGA/SHI

Current status Alternative solution

Association issues - Strategy to be discussed


3D representation of infrasound information

Future design of the IDC softwareA

zim

uth

Sp

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Documents

Infrasound Workshop De Bilt, Netherlands 28-31 October 2002 Infrasound Processing at the IDC and its Near-term Development Petr Firbas International Data