The phrase "a shallower portion" is correct and usable in written English.
It can be used to describe a part of something that is less deep, often in contexts related to water bodies, geological formations, or metaphorical depths.
Example: "The lake has a shallower portion near the shore, making it ideal for children to play safely."
Alternatives: "a less deep area" or "a more shallow section".
This occurrence suggests that the high pore pressure can control the area of the ductile-brittle transition zone, from the ductile mélange matrix to brittle shear veins, in a shallower portion along the subduction interface although the relationship between the high pore fluid pressure, lithification state, and strain rate are not well constrained.
Nevertheless, the temperature condition of the extension veins for each mélange zone shows a similar range, although the data are limited in the Mugi mélange, and this suggests that the extension vein development may finish in a shallower portion in the higher geothermal gradient than that in the lower geothermal gradient.
Indeed, the gradient appears to be steep at 24 hours, with a shallower portion extending into the blade.
In the first, the food is placed on a rack above a shallow portion of water, heated to the boil, in a covered pan; this method is valued for its preservation of colour, texture, flavour, and nutrients.
But the pupfish live primarily in a shallow portion about two feet deep near the opening.
Although these passive source seismic tomography studies could not constrain the details of the shallower portion of the overlying plate, an active source seismic structure study between segments A and B (profile NS1999 in Fig. 1) revealed along-trench structural variation in the shallower portion of the overlying plate (Hayakawa et al., 2002).
The shallower portion of the mega-splay fault system including the WBSF could function mainly as a strike-slip fault.
The tsunami source was estimated in the shallower portion close to the Japan Trench (e.g., Fujii et al., 2011).
(5) The shallower portion of the mega-splay fault system including the WBSF could function mainly as a strike-slip fault.
The floor of the Yellow Sea is a geologically unique, shallow portion of the continental shelf that was submerged after the last ice age (i.e., roughly within the past 10,000 years).
