The phrase "again occur" is correct and usable in written English.
It can be used when referring to something that happens once more or repeats an event or situation.
Example: "If the same issue were to again occur, we would need to reassess our strategy."
Alternatives: "happen again" or "recur again".
"Many of those improvements are already in hand and our shared objective must be that events such as this never again occur in south Gloucestershire".
Measured concentrations are in similar agreement with earlier data on impinging air jets obtained using a Mie scattering technique, although differences again occur between mean concentrations obtained using both laser-based techniques and aspirating probes.
If erosion then results in transfer of mass into the basin center then the equilibrium of the system is again perturbed and crustal flow may again occur to reestablish a new equilibrium state.
Values of these angles will indicate whether the distortions in the bond angles mentioned above are essentially in-plane or whether any unbalanced intramolecular repulsions again occur, which may "distort the distortions".
This investment decline, but growth in installed capacity, may again occur in 2013.
Accepting the status quo means admitting the scenario of a backward and, thereby, that an atomic bombing could again occur.
Policy makers should direct their efforts to ensuring that a similar market collapse never again occurs.
The second major tectonic event took place in the Carboniferous Period, when extensive erosion again occurred.
The problem again occurs when investors try to trade on their own.
Broad doming and uplift again occurred in post-Mississippian time, after which the arch was again submerged.
Ventricular diastole again occurs after the blood has been ejected (during ventricular systole) into the aorta and pulmonary artery.
