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

Abstract

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 Popocatepetl (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 Hcomponent; locally generated geomagnetic pulsations (without preferred polarization) are detected only at Tlamacas station.

Experimental studies of anomalous radon activity in the Tlamacas Mountain, Popocatepetl Volcano area, México: new tools to study lithosphere-atmosphere coupling for forecasting volcanic and seismic events

“…Our earlier studies in the Popocatepetl Volcano area (2003)(2004)(2005)(2006) showed a variety of geomagnetic anomalies that were associated with volcano activity [Kotsarenko et al 2007] and also allowed us to propose the hypothesis of the existence of a second magmatic reservoir [Kotsarenko et al 2008]. The present study is devoted to various aspects of radon monotoring that was carried out in the first stage of our experimental investigations into the area of Popocatepetl Volcano (December 2007to December 2009.…”

“…In the third part of the present study, we examine previously observed geomagnetic anomalies [Kotsarenko et al 2007] and enhanced thunderstorm activity, in terms of the lithosphere-atmosphere coupling caused by intensive radon release under specific conditions in the area of Tlamacas Mountain.…”

“…The intensive radon release for Tlamacas Mountain encouraged us to revise our earlier discovered phenomena [Kotsarenko et al 2007[Kotsarenko et al , 2008: long-term noise was observed in the geomagnetic field measured at the Tlamacas station (Figure 6). To estimate the noise contribution, we compared the noise character for the Tlamacas station registered during a highly perturbed day with a referent signal contaminated by electric welding measured 200 m away from the welding source in Campus Juriquilla, Querétaro, during the construction of a new building.…”

Sistema de monitoramento magnético, na banda ULF, de atividade sísmica e vulcânica para o complexo vulcânico Planchon-Peteroa, Argentina

“…Apesar de dezenas de trabalhos publicados, nas últimas duas décadas, sobre ocorrências de sinais ULF precursores de terremotos e atividades vulcânicas ainda há um certo grau de incerteza sobre suas condições de existência e detecção. Vários são os motivos que contribuem para essa incerteza: raridade de ocorrência desse tipo de eventos; poucas redes de monitoramento existentes; falta de repetibilidade pela impossibilidade de repetição do fenômeno ou pela não detecção simultânea por sistemas de sensoreamento independentes; falta ou não utilização de ferramentas adequadas de processamento de sinais para detecção dos eventos; dificuldades de se separar eventos atmosféricos ou ionosféricos de eventos sísmicos ou vulcânicos, entre outros (Park, 1997, Zlotnicki et al 2006Kolar, 2010;Hayakawa et al 2007;Kotsarenko et al 2005 Essa base de monitoramento já possui um conjunto de sensoreamento de micro-sísmos, baseados em sensores de Emissão Acústica, instalado pelo Istituto Corbino, Roma. A base também possui sistema de monitoramento de emissão de gases, da CNEA.…”

Geomagnetic anomalies observed at volcano Popocatepetl, Mexico

“…Kotsarenko (kotsarenko@geociencias.unam.mx) Different long-term observatories on the electro-magnetic (EM) environment of volcanoes are studied in different countries with high volcano hazards (Currenti et al, 2005;Enomoto et al, 2006;Fujinawa et al, 2006;Hata et al, 2001;Kotsarenko et al, 2007), and reliable physical models for their interpretation are established (Kagiyama et al, 1995;Kopytenko and Nikitina, 2004). In terms of this, the main aim of our study was to analyze the geomagnetic data observed at the Tlamacas station, Popocatepetl, obtained during the period 2003-2006 in order to find anomalies which could be related to geodynamical processes produced by the volcano Popocatepetl.…”