PACIFIC ISLAND REGION SEISMIC NETWORK WITH EMPHASIS ON SAMOA - PowerPoint PPT Presentation

PACIFIC ISLAND REGION SEISMIC NETWORK WITH EMPHASIS ON SAMOA SEISMIC MONITORING. FAATALI MALAEFATU LEAVASA SAMOA

SEISMIC ACTIVITIES IN THE PACIFIC REGION

Pacific Is countries Stations Country Seismic Seismic GPS GPS Tide Under station stations Gauges costrcn. working Not/work working Not/work C.Islands 1 1 1 nil FSM Fiji 3 2 0 0 2 4 Kiribati Nauru New Caldn 2 7 Palau PNG 3 3 0 0 0 Samoa 1 0 2 0 1 6 Solomons Tuvalu 1 1 0 0 1 0 Tonga 4 0 1 0 1 1 Vanuatu 5 3 1 1 2 1

Islands respective network

Geoscience Section Meteorology Division Ministry of Natural Resources and Environment 5

Existing Seismic Monitoring Capability  IMS (International Monitoring Station) / GSN (Global Seismic Network)- auxiliary seismic station (AFI AS095)

AFI AS095 Auxiliary Seismic Station Instrumentation:  Global Seismic Network (GSN) System: (since 1993)  The instrumentation: (Streckeisen)-Long Period STS-1 VBB 3 component; 1 vertical and 2 horizontals, and the Short Period STS-2, which is also a broad band seismometer.  Feb 2010 - replaced the existing Q680 digitizer/recording unit with two Q330-HR digitizers, two B-44 Packet Balers (USB Thumb Drives), and one Slate (signal processor) and installed a remote monitoring device (Falcon) and a 16 port router.  REASON (JUSTIFICATION) FOR CHANGE - The Q680 is nearing the end of its life cycle.

AFI AS095 Auxiliary Seismic Station Instrumentation:  International Monitoring System (IMS): (deployed Sept. 2004)  Data transmitted to Vienna (CTBTO) is via GCI (Global Communications Infrastructure) remote installation VSAT.  ASL (Alburquerque Seismic Lab) receives seismic data directly.  PTWC – also receives seismic data directly.

AFIAMALU VSAT

AFI DATA AND BULLETIN EARTHQUAKE REPORT DATE –29 th September 2009 ---------------------------------------------------------------------------------------------------------------------- A magnitude 8.0 earthquake in the Samoan Region has occurred at: 15.509 ° S, 172.034° W , Depth: 10 km (6.2 miles) on Tuesday , 29 th September , 2009 at 17:48:10 UTC), 06:48:10 am (Samoan Local Time). --------------------------------------------------------------------------------------------------------------------- - SUMMARY Magnitude (Richter) – GSN reading 8.0 MMI Intensity MM 8 Region Samoa Coordinate Location 15.509°S, 172.034°W Depth 10 km Time (SLT) Tuesday September 29 , 2009 at 06:48:10 am (SLT) Distance from Apia (km) 190 km(120 miles) South of Apia, Samoa Felt (YES / NO / ? ) Yes. Tsunami (YES / NO / ? ) Yes. Damaging (YES / NO / ? ) Yes At least 142 people killed in Samoa, 29 people in American Samoa and seven people on Niuatoputapu, Tonga. Widespread damage to infrastructure at Pago Pago, American Samoa, in many parts of Samoa and on Niuatoputapu, Tonga. Felt (V) at Apia, Samoa and (IV) at Tafuna, American Samoa. Felt in much of American Samoa, Samoa and northern Tonga. Felt as far away as Wallis and Futuna Islands. A tsunami with wave heights (peak-to-trough) was recorded at: 314 cm at Pago Pago, American Samoa; 140 cm at Apia, Samoa; 47 cm at Rarotonga and 8 cm at Penrhyn, Cook Islands; 14 cm at Nuku`alofa, Tonga; 11 cm at Papeete, French Polynesia. The broad-scale tectonics of the Tonga region are dominated by the relative convergence of the Pacific and Australia plates,

SAMOA-CHINA SEISMOGRAPH NETWORK (SCSN).  The Network will be comprised of :  three (3) permanent broadband seismic stations;  three (3) sets of portable observation equipment and one (1) Data Management Center in Apia,  as well as satellite transmission equipment to transfer the monitoring data collected form permanent seismic stations to Apia in real time.

SCSN - UPDATE  Project Update  Project MOU and Contract signed  Sites Survey completed Nov 2009  April 2010 – project design and communication discussions in China  March 2011 – Tender processes completed  May 2011 – Construction of NDC begins  May 2011 – Tender for 3 permanent vaults approved by tenders board

SITES

VAULT DESIGN Station Observation house Station seismometer pier Power and grounding

BB AND MOBILE STATIONS  BROAD BAND are permanent stations ~ dimension 3x4 meters.  AC/Solar/Battery  Seismometers , GPS, digitizer, data acquisition, accelerometer.  MOBILE ~ dimension 2x2 m  AC  Short period seismometers  digitizer

DATA CENTER PLAN

DATA CENTER  1 Data Acquisition  2 Data Processing and Analysis  3 Data Exchange and Process  4 Data Storage  5 Data Manage and Server  6 Exhibit Monitor  7 Data Statistics and Compose

TSUNAMI OPERATION AND SEISMIC ANALYSIS/REPORTING Equipment donated by USA (NOAA/PTWC)

Improvements to the former operation system  Quicker public response/warning due to real timing  Ability to forecast arrival time within 10 minutes  Ability to estimate wave height using sea level data within 10 minutes  Ability to visualize other stations arrival.  NDC will improve storage and archives  New seismic stations will improve parameters estimation and data transmission.

For The Region  There is a need to improve warning by establishing more GPS and Seismic Stations.  There is a need to improve networking by close collaboration amongst stations and partners  There is mutual benefit by sharing data globally.  These can be achieved by intergovernmental /focal points agreements and understanding as well as high level talks.

THANK YOU FAATALI MALAEFATU LEAVASA GEOSCIENCE SECTION METEOROLOGY DIVISION MINISTRY OF NATURAL RESOURCES AND ENVIRONMENT SAMOA.