Fractal Analysis of magnetic data measured at Popocatepetl volcano
Abstract
The assumed active Volcanoes has been extensive monitored by means of several techniques, as GPS equipment in order to search important slope changes, surface temperature, volcanic tremors, camera films, changes in gravity or magnetic fields, among others. In particular the Popocatepetl Volcano, situated near to the cities of Mexico and Puebla, has been monitored from around 20 years ago. The monitored systems were increased and continuously surveyed at the end of 1994 when important fumaroles occurred. The data series of total magnetic field recovered each minute at the Tlamacas site (in the volcanic edifice), since 1997 to the end of 2004 was studied in the sense of Higuchi fractal dimension applied to hourly averages. Some windowing were tested to the series in order to find changes in the characteristic scale, and not evidences were found. For that, both data series were analyzed one corresponding to Tlamacas and the other one to Teoloyucan magnetic observatory (Cifuentes, 2009) situated 100 km away from the Popocatepetl. The result of this study shows some kind of correlation between the both series analyzed, and in some periods the linear correlation coefficient is near to one. After that, fractal quadratic differences between series were computed, some periods where these differences could be assigned to local magnetic changes linked to the volcanic activity as a goal. A comparison made between those changes and the fumaroles events and creation of domes could allow that some kind of relationship exits between them.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2009
- Bibcode:
- 2009AGUFMNH43B1324F
- Keywords:
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- 1599 GEOMAGNETISM AND PALEOMAGNETISM / General or miscellaneous