The Comprehensive Nuclear-Test-Ban Treaty Development of the Seismic Networks of the International Monitoring System Lassina ZerboDirector, International Data Centre

Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty OrganisationProvisional Technical SecretariatVienna International CentreP.O. Box 1200A-1400 Vienna IASPEI Cape Town, South AfricaAUSTRIA 11 January 2009

IMS Seismic Networks

50 primary stations sending data to Vienna in real time, continuous mode

• 30 array stations• 19 3-C stations• 1 to be determined

120 auxiliary stations ready to respond to requests from IDC to help characterize the detected event

• 7 array stations• 112 3-C stations• 1 to be determined

New low seismic noise model

Processes

Site surveysSite preparationInstallationCertificationPost-certification Activities

Seismic Noise at PS26 Torodi, Niger

PS26 Torodi, Niger

International Monitoring System Division

The IMS equipment

(GCI Communication topologies)

IMS stationIDC ViennaNDC

IMS station IDC ViennaNDC

BASIC Topology

INDEPENDENT Topology

NDC fully controls data flow to IDC

Not started Under construction Installed Certified

Page 8

Primary Seismic Network

Not started Under construction Installed Certified

Page 9

Auxiliary Seismic Network

Not started Under construction Installed Certified

Page 10

Hydroacoustic Network

Not started Under construction Installed Certified

Page 11

Infrasound Network

IMS Seismic and Hydro Networks

98% of data availability

11 hydroacoustic stations• 6 hydrophone stations• 5 T-phase stations (essentially seismic sensors)

97% timely data availability

Calibrated stations

Standardized stations

CTBT on Funding ofOperation and MaintenanceArticle IV (Verification) of the Treaty:

19. For facilities … in Tables 1-A, 2-A, 3 and 4 of Annex 1 to the Protocol [ie Primary stations], … the Organization.. shall meet the costs of:(b) Operating and maintaining International Monitoring System facilities…(c) Transmitting International Monitoring System data

20. For auxiliary network seismic stations .. the Organization,.. shall meet the costs only of:(a) Transmitting data..;(b) Authenticating data …;(c) Upgrading stations to the required technical standard…;(d) If necessary, establishing new stations

AUTOMATION

SUPPORT

• MAINT

• LOGISTIC

•INFRASTRUTURE

• OFFICE

NDC

STATIONSTATIONSTATION

IDC

SOH

Mon

itorin

g

Trac

king

OPERATIONS ENGINEERING

International Monitoring System

ENGINEERING GROUP

INSTALLATION CERTIFICATION GROUP

GCI

OPERATION CENTER

MONITORING FACILITIESOPERATIONS

UNIT

NETWORK & SYSTEMOPERATIONS

UNIT

AUTOMATION &INFORMATION

Operational Concept

IMS Operational Requirements

Levels of OperationsEntry-into-Force (EIF)Provisional Operations Enhanced Operations (System-Wide Performance Test)

EIF annual availability requirementsPrimary waveform stations:

97% timely data availability98% overall data availability

Radionuclide stations:

95% data availabilityAuxiliary seismic stations:

90% data availability

Communication link availabilityspecification of contract 99.5%

Int. Cooperation Workshop, Abuja 15

29 November - 1 December 2006

98%

IMS Provisional Operations

•Verification System is in Provisional Operations

• Scope and period defined by Commission (CTBT/PC-19/1/Annex II P12-19):

- Provisional Operations does not provide for verification- Protect the investment; efficient and effective utilization- Allow build up, testing and evaluation- ‘Best Effort’ within available resources

e.g. normal working hours

- Provide for Performance Testing in cooperation with station operators and NDCs.

- The Provisional Operations Status is linked to the Current Status of the CTBT…….

16

29 November - 1 December 2006

May 2008IDC/SA/SI Page 17

Network processing in context

Provisional Technical Secretariat Page 18

Map of all the events included in the IDC REBssince February 2000 around the Korean peninsula

9 Oct 2006 event

16 Apr 2002 event 9 Oct 2006

event (presumed explosion)

16 Apr 2002 event (presumed earthquake)

Provisional Technical Secretariat Page 19

Summary on IDC Secure WebsiteSummary on IDC Secure Website

Provisional Technical Secretariat Page 20

Seismic signals recorded in South Korea (KSRS) for 9 Oct 2006 event (left) and 16 Apr 2002 event (right)

9 October 2006 16 April 2002 (presumed earthquake)

More explosion-like More earthquake-like

- But in general, discrimination of (especially small) explosions from earthquakes

is a complex task.

Provisional Technical Secretariat Page 21Animated motion of the emitted gas from 9 to 30 October 2006 (0-30m altitude)

Thank Thank youyou