Brihat Samhita
षड्भिर्मासैः कम्पो द्वाभ्यां पाकं च याति निर्घातः । अन्यानप्युत्पातान्जगुरन्ये मण्डलैरेतैः ॥ ३२-२३ ॥
The effects assigned to earthquakes will occur within six months; those assigned to the other Utpātas will occcur within two months: these occurrences are classified by some under the heads of the four circles above referred to.
english translation
SaDbhirmAsaiH kampo dvAbhyAM pAkaM ca yAti nirghAtaH । anyAnapyutpAtAnjaguranye maNDalairetaiH ॥ 32-23 ॥
hk transliteration by Sanscript