An example of outlining main stratal terminations and related interpretation of seismic reflectors.

An example of outlining main stratal terminations and related interpretation of seismic reflectors. The main seismic terminations are onlap, toplap, and downlap. Onlap terminations consist of semi-horizontal or shallowly dipping younger units against older units, toplap terminations consist of dipping units that are truncated against a relatively horizontal reflector in their upper parts, and downlap terminations consist of more steeply dipping units against an underlying reflector with relatively lower dip. The two seismic examples shown are portions of 2D multi-channel seismic reflection profiles surveyed by the Alfred-Wegener Institute of Polar Research (AWI) in the the Nansen Basin of the Arctic Ocean.

This figure was encouraged by iEarth 2022 seed funds.

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