STROMBOLIAN EXPLOSIONS AT EREBUS VOLCANO: ANALYSIS AND SIMPLE MODELLING
Erebus volcano is an active strato-volcano located on Ross island in the Ross sea (Antarctica). Its predominant activity is Strombolian, characterized by the occurrence of some explosion-quakes per day, but few episodes of phreatic events have occurred in the past thirty years (Aster et al., 2003) a...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.589.1292 http://www2.ogs.trieste.it/gngts/gngts/convegniprecedenti/2007/riassunti/tema-1/1-sess-3/13-dela.pdf |
| Summary: | Erebus volcano is an active strato-volcano located on Ross island in the Ross sea (Antarctica). Its predominant activity is Strombolian, characterized by the occurrence of some explosion-quakes per day, but few episodes of phreatic events have occurred in the past thirty years (Aster et al., 2003) and, occasionally, the occurrence of swarms of explosions (several hundreds daily) has been observed (Kaminuma, 1987; Rowe et al., 2000). In this work we analyze the Strombolian phase of Erebus activity, looking at the high frequency band ($>0.5 Hz$). Our data set is composed of seismic and infrasonic signals recorded by a contin-uous broadband digital seismic network in two periods: 7th- 28th February 2005 and 26th February-27th April 2006. The broad-band seismic stations are equipped with three-components seismometers Guralp CMG 40-T, with linear-response in the range [0.03-50]Hz; the infrasonic signals are record-ed by microphones providing data in the frequency range [0.05-20] Hz (Aster et al., 2004). Both data sets are 40 Hz sampled. The seismic stations are labelled as E1S, NKB, CON, LEH, and the two infrasonic sensors are located at the stations E1S, NKB (Aster et al., 2004). During 7th- 28th February 2005, 54 explosions occurred, whereas 220 explosions were recorded between 26th February- 27th April 2006. We characterize these signals by their frequency content |
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