Deep seismic reflection profile (IBSERSEIS Normal Incidence Transect)

"IBERSEIS is a 303 km long deep seismic reflection profile. The transect was recorded in 56 days (from May to July 2001) using a 400 channel SERCEL 388 and five 22 Ton Vibroseis trucks. The asymmetric split spread configuration changed along the profile according to the dips of outcropping structures. To achieve a high resolution at shallow levels and to image steep dips, a 35 m station spacing and a 70 m Vibration Point interval was used with a high fold (60 in average). A relatively long sweep (20 s) was chosen to increase the source energy rather than increasing the number of sweeps per Vibration Point."

IBERSEIS为一条总长303千米的深地震反射剖面（deep seismic reflection profile）。该测线于2001年5月至7月间耗时56天完成数据采集，采用400道的SERCEL 388地震采集记录仪与5台22吨可控震源车（Vibroseis trucks）完成记录。沿测线方向，非对称双边接收排列（asymmetric split spread configuration）会根据露头构造的倾角随测线动态调整。为实现浅层高分辨率成像并清晰刻画陡倾角构造，本次采集采用35米的道间距与70米的振动点（Vibration Point）间距，平均覆盖次数（fold）达60次。为提升震源输出能量而非增加单振动点的扫描次数，本次采集选用了时长20秒的长扫描信号（sweep）。