Volcano popocatepetl, Mexico: ULF geomagnetic anomalies observed at Tlamacas station during March-July, 2005

Abstract

In this paper the first results of ULF (Ultra Low Frequency) geomagnetic anomalies observed at Tlamacas station (Long. 261.37, Lat. 19.07) located at 4 km near the volcano Popocateped (active volcano, Long. 261.37, Lat. 19.02) for the period March-July, 2005 and their analysis are presented. The geomagnetic data were collected with a 3-axial fluxgate magnetometer designed at UCLA (University of California, Los Angeles, 1 Hz sampling rate frequency, 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 significantly noisier than in other reference stations

the sporadic strong noise-like geomagnetic activity observed in the H-component

locally generated geomagnetic pulsations (without preferred polarization) are detected only at Tiamacas station.