"occurs especially" is a correct and usable phrase in written English.
You can use it when you want to emphasize that something happens frequently or with great frequency in a particular situation or context. Example: In this region, natural disasters occur especially during the monsoon season.
This occurs especially when the transmitter antenna is shakes.
In shipbuilding, serious welding distortion often occurs especially in asymmetric curved blocks.
A focus on individual leaders would ignore or disallow, she said, "a lot of the ways that change actually occurs, especially in a democracy".
This occurs especially where the military knew beforehand of a combat veteran's psychological troubles, marital problems or history of substance abuse.
Johnson writes: "Where this type of 'corporatisation' occurs, especially in the larger commercial developments, Londoners can feel themselves excluded from parts of their own city".
The results reveal that the boiling heat transfer occurs, especially in the high temperature area near the turbine side.
Infection of the outer-ear canal by molds or various microorganisms occurs especially in warm, humid climates and among swimmers.
As a consequence, early fatigue damage occurs especially in structural details such as notched areas and welded parts.
Yttrium occurs especially in the heavy rare-earth ores, of which laterite clays, gadolinite, euxenite, and xenotime are the most important.
If a blood protein, called albumin, gets too low, fluid is retained and edema occurs, especially in the feet, ankles and lower legs.
Bud deacclimation is a real threat if warming occurs, especially if it is prolonged, because it becomes more difficult to reacclimate buds toward late winter and early spring.
