Esline Garaebiti, Vanuatu Meteorology and Geohazards Department (VMGD)Sylvain Todman, Vanuatu Meteorology and Geohazards Department (VMGD)

IRIS Metadata Workshop, 9th to 13th of January 2011, Bangkok, Thailand

“MANAGING WAVEFORM DATA AND RELATED METADATA FOR SEISMIC NETWORKS”

Vanuatu

Geographical location

- Located in the south west Pacific, east of Australia

Geographical location

Extracted from one DGMWR report

Two subduction Zones: • Western subduction belt

from PNG to Vanuatu• The Eastern subduction

Belt from Tonga down to NZ

• The Vanuatu trench limiting 2 subducting the indo-Australian plate in the west and the Pacific Plate on the east side of the trench

• Converging velocities of plates 12cm/year in North and South, 3,5cm/year in central

High seismic activity in the area with depth ranging from 0 to 500 km.

Tsunami-genic earthquake and volcanoes Zones

Historical tsunami occurrences with casualties (PNG in 1998, Vanuatu 1999, Solomon 2007, Tonga and Samoa, 2009 ….)

Pacific plate

Indo-Australian Plate

Seismicity in Vanuatu (USGS)

Ambrym7.5 (1999)

Port Vila7.2 (2002)7.5 (2010)7.2,2011

Torres7.9 (1997)7.8 (2009)7.3,(2009)

Santo7.0 (2000, 2007)

Est Loyauté7.2 (2003/07)

Nord

Central

Sud

Extrème sud

Tanna7.3 (2010)

-Seismic gap at central and south Vanuau

-Strong earthquakes

•Torres, Magnitude7.9 in 1997, 7.8 in 2009

•Ambrym, Magnitude7.5 in 1999, casualties

•Santo, Magnitude7.0 in 2000 and in 2007

•Port Vila, Magnitude 7.3 in 2002, and 7.5 in 2010, 7.2 in 2011

•Torres, M7.8, 7.3 in 2009

•South Vanuatu, Magnitude 7.3 in 2010 and 2011

Volcano monitoring network

1 permanent , CMG-40, Q330

4 in temporary stations2 CMG-40, Q3304 trillium 120s1 CMG-6TDMINISEED format

Data still to be transmitted in RT, stations still to be integrated into SEISCOMP3

Local seismic network on Efate, with 3 stations up and running, 1 yet to be installed.

3 seismic stations 2 SP stations 1 Hz station L4D3 1Episensor Data format SEED VLF telemetry system Data processing and analysis by

SEISSAN and SEISCOMP3

1 Geoscope station in Santo 1 STS2 1 Quanterra Q330 1 Episensor Transfer of data through ADS

4 stations for research purposes Guralp CMG_40 DM24

NDC of CTBTO installed in the VMGD head office in may 2011

Geohazards Observatory operates SEISCOMP3 since March 2011

3 SP and 1 BB stations in Vanuatu Spread along the Island arc

7 BB stations in New caledonia

Data are shared through a seedlink, server donc, redistributed by the IRIS server in real time (rtserve.iris.washington.edu)

Each network operates SEISCOMP3

New Caledonia

Vanuatu

Seismic event of 2012/01/08 at 21:51:47.6 UTC , Local time : 2012/01/09 at 08:51:47 in Vanuatu Islands

Magnitude : M 5.1

Depth : 12 km

Latitude : 17.43 S

Longitude : 167.99 E

Detected in : 2 min 27 sec

Volcano Alert Bulletins

Earthquake information

bulletins

Tsunami advisory bulletins

Dissemination by

Email

Website:

www.geohazards.vanuatu.gov.v

u

International Alert System: USGS (Internet web service) & PTWC (CISN Display, Tide tool)

Internal Alert System with SEISCOMP3: Step 1: Seiscomp3 earthquake automatic detection

Step 2: Internal earthquake Alert system Local earthquake (Vanuatu – NC) : Magnitude > 4.5 Regional earthquake (SWP region): Magnitude > 6.2 International earthquake: Magnitude > 7.2

Step 3: Email and SMS notification to on-duty staff

Step 4: Confirmation by Geohazards on-duty officer Decisions taken by earthquakes threshold, M7,5 for regional and

distant tsunami, M7,1 for local tsunami Step 5: Tsunami Advisory produced by Forecast on-duty officer

Vanuatu network• Automatize

Tsunami Warning and earthquake alerts

• Integration of all existing monitoring stations in Vanuatu (Volcano and seismic) into SEISCOMP

• Add other future stations into the system

Fiji

Vanuatu

New Caledonia

Merge of Vanuatu-New Caledonia network (> 10 stations , quick determination )

Repeat networking pattern with other networks, Fiji/Tonga, Samoa, PNG and Solomon networks

Existing seismic networkVolcano monitoring network

Future seismic stations

Thank you for your attention