The phrase "at shallow levels" is correct and usable in written English.
It can be used to describe something that occurs or exists at a superficial or minor depth, often in contexts related to water, psychology, or analysis.
Example: "The fish tend to gather at shallow levels during the warmer months."
Alternatives: "at minor depths" or "at surface levels".
The low-temperature neutral alteration might be locally distributed at shallow levels.
Magma intruded at shallow levels releases large amounts of gas due to decompression (first boiling).
Anticholinesterase drugs may produce paradoxical neuromuscular block when administered at shallow levels of neuromuscular block.
The negative thermal anomaly in the southeast of Munich is far less pronounced than at shallow levels.
Phreatic eruptions result from rapid heating and vaporization of fluids which are commonly situated at shallow levels beneath a volcano.
These studies on fumarolic gases infer that the granitic basement is located at shallow levels, which is consistent with our interpretation of the high resistivity layer.
Mixing of deep volatile and shallow groundwater causes the resistivity change at shallow level.
Due to increasing demand for groundwater vis-a-vis depleting groundwater levels in the region, land developers are locating their housing societies in the vicinity of seasonal rivers or abandoned channels, where groundwater remains at shallow level with quality groundwater.
On the contrary, it could play as combined barriers conduits during its later evolution (progressively at shallower levels) being characterised by intersecting fault planes, which define pipe-like conduits parallel to the direction of the tectonic transport.
At depths below 6000 m bsl (Fig. 9a, b), the pattern of temperature distribution is more smooth than at shallower levels though the contour of the Molasse Basin in the temperature distribution is still visible.
