The recovery of SN4 took place on 2010-03-26 (Fig. 7). System was recovered on ITU's pier at Tuzla and maintanance started. First, the collected data were downloaded and checked. Second, the system was cleaned, the batteries were replaced and all subsystems and sensors were controlled. A problem in current meter software was solved. Figure 8 shows the seismometer data of the 2010-03-08T02:32+0000 M6 event in E Turkey on NAF.
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