Citation: | GAO Junfeng, TANG Songhua, ZHANG Shengjiang, JIANG Shenghui, LIU Longlong, WANG Shengmin, LIN Sen, HUANG Yao. Using amplitude properties of shallow seismic profiles to reveal the seabed sediment types: A case study in Zhoushan Islands[J]. Marine Geology & Quaternary Geology, 2023, 43(6): 131-144. doi: 10.16562/j.cnki.0256-1492.2023050401 |
Using acoustic parameters to reveal sediment types is of great significance for ocean research and development. Obtaining sediment types based on limited seabed sampling or in situ testing has often high cost, low efficiency, and poor continuity, to which acoustic profiling provides an advantageous tool that is rapid, continuous, convenient, and economical. Based on the high density and high resolution shallow stratigraphic profile data obtained in Zhoushan Islands periphery, East Chia Sea, technologies of pre-processing, amplitude attribute extraction, and so on were used to decipher the submarine surface sediment types. By comparing the geomorphic types interpreted from side scan sonar data and measured submarine surface sediment types, we found that the RMS (root mean square) attribute of the amplitude on shallow strata profile could accurately reflect the types of seafloor surface sediments. According to the amplitude RMS attribute of 1100 km shallow stratum profile obtained recently, the sediment types of Zhoushan Islands were interpretated, including mainly clay, clay silt, silt, sand, and bedrock. Compared to the measured data, the rate of successful match reached over 72%. This study provided a feasible way using the amplitude attribute of shallow seismic profiling to determine the surface sediment type in the study area and beyond.
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Deployment of shallow seismic profiles and side scan sonar lines in the study area
Comparison of seafloor amplitude properties before (a) and after (b) bandpass filtering
Amplitude compensation Profiles comparison before (left) and after (b) profiles comparison amplitude compensation
Before (left) and after (right) seabed multiple multi-wave processing
Seafloor tracking pickup
Wavelet length estimation
Source record of no excitation from 3500 to the 3670 shot
Amplitude attribute values extracted from shallow seismic profiles
Each amplitude properties values Kriegin rasterized contour mapContour map of each amplitude attribute value after Kriging rasterization
Bedrock outcrop at the bottom of the tidal channel revealed by side-scan sonar data
Sand waves revealed by side scan sonar
Geomorphic classification and distribution interpreted by side scan sonar data
Profile comparison before and after multiplex extraction
Reflection coefficient properties (up) and contour map (down) of shallow seismic profiles
Comparison of reflection coefficient (a) and RMS attributes (b)
Comparison of measured surface sediment types and amplitude attributes of shallow seismic profiles in the study area
Seafloor surface sediment types derived from RMS amplitude attributes based on shallow seismic profiles