The deployment of the INGV's SN-4 took place afternoon of 2010-03 31. Ship arrived around station at 10:00 local, and a moored buoy was deployed to help localizazione of mooring. A first attempt was not successful due to problems in acoustic release. The final destination was chosen to be very close to the NAF, on a flat bottom 150m depth just N of the steep EW striking valley merging a few hundred m to the W with the Izmit Canyon. The second one was successful (14:34 Local Time). System on bottom responded with tilt angles 9 and 12 °and heading 246 °. All other instrumentation behaviour was found to be normal. Figure 9 shows the localization on seabottom of the SN4 observatory.
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