1. IRIS workshop on “Managing Waveform Data and Related Metadata from Seismic Networks” Hotel Windsor Suites, Bangkok, Thailand 08-13, January, 2012 Ashvin Wickramasooriya Senior Lecturer in Earth Science South Eastern University of Sri Lanka

2. CONTENTS OVERVIEW SRI LANKAN SEISMIC NETWORK SOUTH EAST SEISMIC STATION SPECIFICATIONS: SENSORS/LOGGER/SOFTWARE

3. Overview There was no seismic network system for Sri Lanka before 2005 However, a single seismic station was established in 1996 under the Global Seismic Network (GSN) at Pallekale, Kandy First Sri Lankan Seismic Network has established in June, 2005 funded by the Japanese Government (JICA)

4. 1)Detect a domestic earthquake and calculate Epicenter and Magnitude 2)Post processing function 3) Data communication: Telephone Line (Dial up) (To reduce the running cost) 4) Four Seismic Stations (To calculate Epicenter) Initial Plan of establishing this seismic network include :

5. SRI LANKAN SEISMIC NETWORK June, 2005 Funded by JICA There are four seismic stations were established under this network at four universities. Local station(RHN) Ruhuna Univ. Local station(RJR) Rajarata Univ. Central Station (PRD) Peradeniya Univ. Local station(EST) South-East Univ.

6. Overview (Function) 1)Continuous Data recording (6ch, one month) 6ch: Acceleration 3ch, Velocity 3ch 2)Automatic Trigger Function and Call to Central Station (Peradeniya) 3) Automatic Data correction from Central Station to Local Station (Manual correction is also Available) 4) Automatic Processing Function (SEISAN) Epicenter(Domestic), Magnitude 5) Post Processing Function (SEISAN)

7. Software for Central Station Data Collection from each stations Data Storage Data Analysis *Epicenter *Magnitude *Spectrum etc Maintenance (Each station ) Telephone Line Data Logger (6ch) with GPS Personal Computer Hub Printer U P S Modem TCP/IP Protocol Converter Router Concrete Base Outside Inside Central Station (Peradeniya) UNIV. LAN Short period seismometer Forcebaranse servo accelerometer RAJ RHN SET

8. Telephone Line Data Logger (6ch) with GPS Personal Computer Hub Printer U P S Modem TCP/IP Protocol Converter Router Concrete Base Outside Inside Local Stations (Rajarata, Ruhuna, South-Eastern) Short period seismometer Forcebalance servo accelerometer Software for Local station Data Collection (Own site, Manual) Data Storage (Do) Maintenance (Own site) Central Station

9. SOUTH EAST SEISMIC STATION 1.Sensor: 1)Forcebalance Servo Accelerometer : Episensor 2)Seismometer (1Hz Geophone):GS-1 2.Data Logger: 24bit Data Logger : Altus K2 3.Data Acquisition: PC Based System : Recording: SMARTS Processing: SEISAN 4.Communication: Telephone line (Analog, Dial-up)

10. Sensors Seismometer GS-1 Accelerometer Episensor Epi-sensor  Suitable for Strong motion GS-1  Suitable for Micro-seismic

11. Data logger

12. Site Installation Installation Data Processing system

13. Resolution & Dynamic Range Full scale of K2 : 2.5V A/D resolution : 2.5V/2 23 = 0.298 microV Acceleration: (0.23mgal) – 1960 gal –Effective resolution: 10 mgal ? Velocity: (0.0745 microkine) – 625 mkine –Effective resolution: 10 microkine? GS-1 for small earthquake Epi-sensor for strong motion

14. Software configuration Local Stations Central Station

15. Thank You