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IMPROVING REAL-TIME DETECTION AND LOCATION OF LOCAL SEISMIC EVENTS IN ROMANIA
Abstract
National Institute for Earth Physics (NIEP) has started the development of its own realtime seismic network since 2002. The network is designed to monitor the seismic activity on Romania territory, which is dominated by intermediate earthquake from the Vrancea area. In present the network consist of 115 seismic stations and two seismic array. The seismic stations are equipped with Quanterra Q330 or Basalt digitizers, broad-band seismometers (STS2, CMG40T, CMG 3ESP, CMG3T, PBB-200s) or shortperiod sensors (MARK L4C, MARK L22, RANGER). Most of the velocity sensors are collocated with Episensors Kinemetrics acceleration sensors. The processing software used by the National Data Center are Antelope and Seiscomp3. The program used for the automatic real-time locations in this study is Seiscomp3. Seedlink which is a part of Seiscomp3 is used for data acquisition in real time and also for data exchange. The automated software was tuned to obtain the most accurate location for the earthquakes and avoiding any false events. Different parameters were tested (like: STA/LTA, filters applied to the waveforms) on a data set of earthquakes representative for the local seismicity. Now Seiscomp3 is running in real time and detected over 300 seismic events. NIEP has developed a web application that uses the data stored in the database to display earthquake information, like location, magnitude and depth in real time. Another use for the data collected is to create and maintain contact lists to which datacenter sends notifications (email), based on the parameter of the earthquake. NIEP plans is to develop the means to cross-check the data generated between the different analysis systems. (e.g. comparing data generated by Antelope with data generated by Seiscomp).
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