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The evolution of the ULF resonant structure ob- served at Teoloyucan geomagnetic station has been provi- sionally studied in a possible relation with seismic activity in Mexico in the period 1999-2001. Two resonant lines were observed in the H-component (linear polarization) in the fre- quency bands fR2=10.2 11.1 mHz and fR2=13.6 14.5 mHz, sometimes accompanied by other harmonics. The source of the observed resonances is possibly related with the geomagnetic location of the station (geomagnetic lati- tude =29.1 ) and its proximity to the equatorial electrojet ( 30 ). An enhancement of the carrier frequency of both resonances in the period 1 month-2 weeks was found before the strongest EQs. Also, a depression of the resonant struc- ture just a few days before and a few days after some EQs seems to be correlated with seismic activity.

Possible seismogenic origin of changes in the ULF EM resonant structure observed at Teoloyucan geomagnetic station, Mexico, 1999-2001