EVALUATION OF CURRENT STATUS OF THE UNIVERSITY SEISMIC NETWORK IN SRI LANKA AND PROPOSAL OF ITS UPGRADE
Supervisor: Tatsuhiko HARA
Country: Sri Lanka
In order to investigate the current status of the University Seismic Network in Sri Lanka, which was funded by Japan International Cooperation Agency (JICA) and is operating since 2003, data availability, detectability and P, S arrival times were checked. The results indicate that system is able to detect events with magnitude greater than 6, within the epicentral distance up to 20 degrees. Due to low S/N ratio, it is difficult to detect smaller events in regional scale and local events. There is a good agreement between the observed P arrival time and the theoretical P arrival time but systematic decrease in S-P time difference. Communication problem and poor site selection are the major problems. An upgrade plan of the current network consisting of relocation of the sensors and establishing real time data communication. It is desirable to combine data from the University Seismic Network and data from the PALK broadband station for earthquake monitoring and tsunami alert for Sri Lanka. Broadband moment magnitude, Mwp was calculated using data for PALK station to find that it is possible to obtain relatively reliable magnitude estimates using data from single station.
|Citation: ||Bulletin of IISEE, 42, 37-42.|