This statement is incorrect:
Most probably, the hash rate spike is caused by launching of a new mining center or commissioning of new mining equipment.
Hash rate spikes are due to the random nature of the mining process. The reported hash rate is an estimate derived by measuring the time between blocks. The time between blocks is random. If that time happens to be less than 10 minutes each for many blocks in a row, then it will appear as an increase in the hash rate, even if there is no change in the actual hash rate.