naa a22 4500 510765041 CHVBK 20180411083153.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1134/S000143701305007X doi (NATIONALLICENCE)springer-10.1134/S000143701305007X Coherent seismic sea-bottom profiling based on broadband signals [Elektronische Daten] [V. Lazarev, A. Malekhanov, L. Merklin, V. Romanova, V. Talanov, A. Khil'ko] Experimental results of the seismic profiling with bottom penetration up to 1000 m based on broadband signals and conducted in the Caspian Sea sites are presented. Use has been made of synchronized sequences of probing pulses with linear frequency modulation at a frequency deviation of 50 to100 Hz. The pulses were emitted by a towed sound source of an original design (acoustic power up to 300 W, frequency ranged from 100 to 1000 Hz) and received by a standard digital seismic streamer. The processing of the signals involved the matched filtering of the individual pulses and the trajectory accumulation of a long sequence of pulses lengthwise the horizontal-homogeneous reflecting layers of the bottom structure. The adaptive stacking procedure taking into account the linear inclinations of the individual layers allowed us to enlarge the stacking interval by up to 100 pulses and to increase the effective depth and the spatial resolution of the seismic profiling, which gave us a total increase of more than 30 dB in the S/N ratio. In our view, the seismic profiling using low-power (about 100 W) and broadband (up to several hundred Hz) coherent sound sources represents a promising technology for decreasing the hazardous impact on aquatic ecosystems. The approach developed is an alternative to the conventional technology of marine seismic prospecting based on powerful pulse sources of the shock type (air guns, sparkers) in the low frequency range (less than ∼200 Hz). Pleiades Publishing, Inc., 2013 Lazarev V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut Malekhanov A. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut Merklin L. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia aut Romanova V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut Talanov V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut Khil'ko A. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut Oceanology Springer US; http://www.springer-ny.com 53/6(2013-11-01), 755-761 0001-4370 53:6<755 2013 53 11491 https://doi.org/10.1134/S000143701305007X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S000143701305007X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lazarev V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut NATIONALLICENCE 700 1- Malekhanov A. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut NATIONALLICENCE 700 1- Merklin L. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 700 1- Romanova V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut NATIONALLICENCE 700 1- Talanov V. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut NATIONALLICENCE 700 1- Khil'ko A. Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia aut NATIONALLICENCE 773 0- Oceanology Springer US; http://www.springer-ny.com 53/6(2013-11-01), 755-761 0001-4370 53:6<755 2013 53 11491 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer