Materials of the International Conference
50th Anniversary of the International Geophysical Year
and Electronic Geophysical Year

16-19 September 2007 • Suzdal, Russia

Telematic systems of volcano and earthquake monitoring

A. D. Gvishiani, S. M. Agayan, Sh. R. Bogoutdinov, and E. N. Graeva

Geophysical Center, Russian Academy of Sciences, Moscow, Russia

Abstract

In the report, three examples are presented of using fuzzy logic algorithms to do telematic work with data on monitoring of La Fournaise and Etna volcanoes and an example is given of work done in the Global Geodynamic Project. Creation of algorithms to process data on La Fournaise volcano started in cooperation with laboratory of volcanology, Pascal Blaise University (Clermont-Ferrand, France). Piton de La Fournaise is located in Reunion Island in the western Indian Ocean and is one of the most active volcanoes in the Earth. Now we know about 1500 eruptions of this volcano since the middle of the XXVII century. The latest eruption started on 20 July 2006 and finished on 1 January 2007. The volcano monitoring began in 1981. It resulted in creation of a unique database on time series observations comprising the active period of 1981–1992 (more than 25 eruptions), quiescent period of 1992–1998 and resumed activity period after 1998 (12 eruptions). The study and processing of these time series led to the construction of automated algorithms to separate active sections of records and this is what out laboratory is involved in. Formerly it took arranging several expeditions a year to the island to get information and then volcanologists processed data manually. Now work is carried out in the following way. Records are transmitted by data communication channel to Clermont-Ferrand and then to Moscow where they are processed. Processing results are the times of signal beginning and end, signal length, intensity and others. The comparison of manual and automated processing made by the French volcanologist Jaque Zlotnicki showed coincidence in more than 95% of cases. The technology used to process time series data from La Fournaise volcano was used in the international research project "Global Geodynamic Project." In various points of the globe, 18 superconductor gravimeters were set up and joined in a single network SGr. Observations started in 1997 give data of scientific value for different branches of science and problems related to gravimetry, theory of tides, atmospheric research, volcanology and seismology. Records obtained with the use of SGr show drift, which results in distortion of the record. Data from the gravimetes came to the Institute of the Physics of the Earth in Strasbourg (France) and then to Moscow where jump anomalies were separated. Then specialists from France decided whether the anomaly is a jump or not. One more example of telematic volcano monitoring is processing interferograms from Etna volcano located in the east of Sicily (Italy). It is 3350 m high and is the highest volcano in Europe. Besides it has the longest recorded history of eruptions. The latest eruption was in April 2007. Data obtained with the use of radar interferometry and not time series were used as initial data. From 1992 to 1999, 38 photos were made with the use of satellites ERS-1 and ERS-2 and from these data 238 interferograms were calculated. Each of them is an area of 55x55 km around Etna volcano subdivided into more then 4 million nodes. Each node has a scaled value from 0 to 255, which is a phase distance variation. Areas where values did not change abruptly that is smooth points are of particular interest. In this area, they, for the major part, contain lava fields.

Citation: A. D. Gvishiani, S. M. Agayan, Sh. R. Bogoutdinov, and E. N. Graeva (2007), Telematic systems of volcano and earthquake monitoring, in: Materials of the International Conference '50th Anniversary of the International Geophysical Year and Electronic Geophysical Year', GC RAS, Moscow, doi:10.2205/2007-IGY50conf.

© 2007 Geophysical Center RAS and authors


Webmaster