The analysis of reflected, high-resolution seismic data shows a distinct separation of regions with good and poor seismic penetration. Additional analysis of core data revealed good correlation between grain size and seismic penetration. As a case study, a shallow geophysical survey using a Chirp profiler was conducted in the southwestern part of the Sea of Galilee. By correlating the seismic and core data we found that areas with good seismic penetration represent coarse clastics, while poor seismic penetration is related to fine clays. New detailed bathymetric mapping and bottom morphology images combined with the penetration characteristics of the Chirp signal reveal a large alluvial fan consisting mainly of coarse material (sand to pebbles). A fine-grained band of mostly clay-size material, associated with an asymmetric bathymetric channel, continues the trend of the old entrance of the Yavniel Creek into the Sea of Galilee. We interpret the fine-clay stripe to be a low energy streambed of the Yavniel Creek. The clear relations between the reflected Chirp signal and the grain size of the water-bottom sediments suggests that this type of survey can be used to characterize depositional environments.
Bibliographical noteFunding Information:
The study is funded by the Israel Science Foundation grant #12-03 to S. Marco. Landmark Graphics Co. contributed software. We thank the Kinneret Lake police for assistance during survey operation. We are grateful to the staff of Institute of Oceanography and Lake Research, in particular Arik Golan and Gideon Amit who operated the boat and geophysical equipment. We are thankful to David Bridgland and an anonymous journal referee for constructive reviews that significantly improved the manuscript.
- Alluvial systems
- Sea of Galilee
- Seismic reflection
ASJC Scopus subject areas
- Earth-Surface Processes