[SSS11-P03] Seimic Reflection Survey in Aizubange, Fukushima
Keywords:seismic reflection survey, Aizu Basin
We conducted seismic reflection survey along the 4.8km survey line from Todera area at Aizubange, Fukushima, toward east. The survey was carried out from 9 to 18 in October, 2017. Spatial intervals of shots and receiver points are 2m. We used telemetry recording system. Receiver points are 192 simultaneously, and maximum offset is 382m. Sampling interval is 0.5ms, and record length is 2s. We used mini impactor (JMS-Mini65) for seismic source, and hit three times at each point.
First arrivals about 2.0 km/s of apparent velocity can be seen to the far end of the shot records. They are the refracted wave. These phases are transformed into later phases; reflected waves from first arrivals near the shot points. Several reflected events can be seen until 0.6s around the shot point besides them.
We made time profile with constant velocity, and many events can be see in the profile. However, we consider that many false phase caused by noise will be included in the profile. We must remove noise from traces in order to confirm the continuity of the reflected events, and we are going to do soon.