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In this paper the first results of ULF (Ultra Low Frequency) geomagnetic anomalies observed at Tla- macas station (Long. 261.37, Lat. 19.07) located at 4 km near the volcano Popocatepetl (active volcano, Long. 261.37, Lat. 19.02) for the period March-July, 2005 and their analy- sis are presented. The geomagnetic data were collected with a 3-axial fluxgate magnetometer designed at UCLA (Uni- versity of California, Los Angeles, 1 Hz sampling rate fre- quency, GPS). Our analysis reveals some anomalies which are suspected to be generated by local volcanic origin: the EM background in the vicinity of the volcano is signifi- cantly noisier than in other reference stations; the sporadic strong noise-like geomagnetic activity observed in the H- component; locally generated geomagnetic pulsations (with- out preferred polarization) are detected only at Tlamacas sta- tion.

Volcano Popocatepetl, Mexico: ULF geomagnetic anomalies observed at Tlamacas station during March–July, 2005