STATION FEATURES

Belbasi Arrays (Treaty code: PS-43) is composed of two sub-arrays (Ankara and Keskin) is shown in the below Figure the medium-period array with a 40 km radius located in Ankara and the short-period array with a 3 km radius located in Keskin. Each array has a broadband element located at the middle of the circular geometry. Short-period instruments are installed at depth 30 meters from the surface while medium and broadband instruments are installed at depth 60 meters from the surface. Freewave Wireless Data Transceivers which form the basis of RDL provide intra-site communications from all instrument sites. The data from both arrays come to CRB (Central recording Building) and data is sent to IDC via satellite (VSAT) whereas KOERI (Kandilli Observatory and Earthquake Research Institute) and AFTAC (Air Force Technical Application Center) receive the data via telephone lines.

Data Transmission Rate

The graph below shows the data availability of the BRTR seismic array since 2004. Data communication was provided via Microwave Systems between 2004 and 2005, and the RDL (Radio Data Link) System was adopted starting in 2006. Due to improvements in RDL equipment, availability has fluctuated but shown an increasing trend each year. The red line indicates the IMS requirement threshold for data availability (98%). IMS stations are expected to meet this threshold to be considered operational.

Data Communication Schema

BRTR's communication system uses four types of antennas (6dB, 15dB, 21dB, and 24dB): 6dB and 15dB antennas for the Short Period Array (~ 2 km radius), and 21dB and 24dB antennas for the Medium Period Array (~ 20 km radius). The distance between these two seismic arrays is approximately 60 km.