This is the 10824th most frequent Turkish word.
depremlerinin
"Of the earthquakes" or "earthquake's" (possessive form in Turkish).
Here, 'depremlerinin' indicates possessiveness, referring to 'the earthquakes' that belong to Turkey.
Türkiye'nin depremlerinin tarihî kayıtları çok önemlidir.
The historical records of Turkey's earthquakes are very important.
In this sentence, 'depremlerinin' refers to the effects belonging to 'the earthquakes'.
Depremlerinin etkileri, bölgedeki altyapıyı büyük ölçüde zarar gördü.
The effects of the earthquakes caused significant damage to the region's infrastructure.
The use of 'depremlerinin' here implies ownership, referring to the causes that are related to 'the earthquakes'.