Seismic vs. geodetic moments at Mt. Etna volcano: A tool for a rapid understanding the eruptive behaviour?

Gambino, Salvatore; Distefano, Giovanni; Maiolino, Vincenza; Gresta, S.

doi:10.1016/j.jvolgeores.2018.10.012

Cited by 3 publications

(7 citation statements)

References 27 publications

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“…Table 2: Intrusive seismic swarm parameters. The duration represents the time interval in which there is contemporaneity between seismicity and ground deformation ( [30] and references therein; [50,63]). The seismic moment M o was obtained by using ( 1) and ( 2) relationships.…”

Section: Discussionmentioning

confidence: 99%

“…The 1991-1993 eruption was characterized by low explosive activity and produced a very large lava field (total volume of magma of about 235 * 10 6 m 3 ). A shallow intrusion on the upper eastern flank, inferred by Bonaccorso et al [37], was accompanied by a seismic swarm of 250 recorded events [38] occurring in the same area within 17 hours before the fractures opened on December 14, 1991 [30].…”

Section: Earthquake Locationmentioning

confidence: 94%

“…Instrumental investigations of seismicity began at Mt. Etna at the end of the 1960s with a network that ran for about 30 years and included up to 11 one-component (vertical) stations equipped with 1.0 Hz seismometers [30,31]. All times reported hereinafter are in GMT.…”

Section: Seismic Data and Earthquake Locationmentioning

confidence: 99%

“…The seismic moment varies within an order of magnitude between ca. 4:0 * 10 15 Nm and 4:0 * 10 16 Nm [30,52].…”

Section: Intrusive Seismic Swarmmentioning

confidence: 99%

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Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Gambino

Distefano

2022

International Journal of Geophysics

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The Timpe Fault System (TFS) represents the source of shallow earthquakes that strike numerous towns and villages on Mt. Etna’s eastern flank. In the last 40 years, three destructive seismic events reached I 0 = VIII EMS (heavily damaging) in 1984 (October 25), 2002 (October 29), and 2018 (December 26). These events followed a few days after the occurrence of strong seismic swarms and the sudden acceleration of the eastern flank seaward. The damaging seismic events in 2002 and 2018 were associated with dike intrusions and eruptions of the volcano; however, no eruptive activity was observed at the time of the 1984 earthquakes. In this study, we investigate seismic parameters for the 1984 sequence, in order to interpret the seismicity in terms of volcanic activity. Parameters such as localization, cumulative seismic moment, and hourly occurrence frequency of the 1984 seismic swarm have been analysed and shown to have typical values of Mt. Etna’s intrusive seismic swarms. This suggests that the 1984 episode may have been an aborted intrusive magma episode that triggered similar processes (long and powerful intrusions with acceleration of the eastern flank movement and destructive earthquakes), as in 2002 and 2018. These three episodes suggest that an evaluation of some seismic parameters during future intrusive swarms may furnish indications of a possible reactivation of the TFS.

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Section: Discussionmentioning

confidence: 99%

Section: Earthquake Locationmentioning

confidence: 94%

Section: Seismic Data and Earthquake Locationmentioning

confidence: 99%

“…The seismic moment varies within an order of magnitude between ca. 4:0 * 10 15 Nm and 4:0 * 10 16 Nm [30,52].…”

Section: Intrusive Seismic Swarmmentioning

confidence: 99%

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Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Gambino

Distefano

2022

International Journal of Geophysics

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“…In the last 40 years (Table 1 and Fig. 2 The 2002 and 2018 events were preceded by signi cant stress changes due to eruptive dike intrusion that triggered the vigorous eastward movement of the SE ank of Etna with activation of the PFS (Walter et al Gambino et al 2018).…”

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confidence: 99%

Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Gambino¹,

Distefano²

2021

Preprint

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The Timpe Fault System (TFS) represents the source of shallow earthquakes that strike numerous towns and villages on Mt. Etna eastern flank. In the last 40 years, three destructive seismic events reached I0 = VIII EMS (heavily damaging) - in 1984 (October 25), 2002 (October 29) and 2018 (December 26). These events followed a few days after the occurrence of strong seismic swarms and the sudden acceleration of the eastern flank seaward. However, if the 2002 and 2018 events were caused by stress induced by eruptive dike propagation, in October 1984 no eruption occurred. In this work, parameters such as localization, cumulative seismic moment and hourly occurrence frequency of the 1984 seismic swarm, have been analyzed and shown to have typical values of Mt. Etna intrusive seismic swarms. This suggests that the 1984 episode may have been an aborted intrusive magma episode that triggered similar processes (long and powerful intrusions with acceleration of the eastern flank movement and destructive earthquakes), as in 2002 and 2018. These three episodes suggest that an evaluation of some seismic parameters during future intrusive swarms may furnish indications of a possible re-activation of the TFS.

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Monitoring magma migration at Mt. Etna using the Seismic Amplitude Ratio Analysis method

Rasaneh

Hajian

Hodhodi

et al. 2022

Annals of Geophysics

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The Seismic Amplitude Ratio Analysis method (SARA) was applied to data recorded six days before the May 13, 2008 eruption of Mt. Etna to test its potential as a forecasting attribute. By using this method, the magma migration path, as well as the seismic migration, can be determined with the amplitude of continuous data recorded at least at one pair of stations from a seismic network near the eruption site. Due to the sudden changes in the seismic amplitude ratio calculated for each pair of stations, the seismic migration trend, as well as the magma path at depths, were detected before the main eruption. The start and end times of the seismic swarms were also determined. The standard practice to achieve similar results is to use volcanic tremors, which must be pre-selected thus reducing efficiency and increasing the time needed. By using the whole seismic signal, the method provides a simpler semi-automated alternative, especially for a seismic event or places where it is not possible to record tremors continuously. This simple method is useful to reduce uncertainties relative to hazardous magma propagation during volcanic unrest, as it helps improve the accuracy of locating seismic swarms and determining the direction of magma movement at depth before the eruption. We also analyzed the amplitude ratio trend using Mann-Kendall and Sen's estimator test. The results of these tests confirmed a positive and increasing trend from the day before the eruption in most pairs of stations.

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Seismic vs. geodetic moments at Mt. Etna volcano: A tool for a rapid understanding the eruptive behaviour?

Cited by 3 publications

References 27 publications

Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Intrusive Seismic Swarms as Possible Precursors of Destructive Earthquakes on Mt. Etna’s Eastern Flank

Monitoring magma migration at Mt. Etna using the Seismic Amplitude Ratio Analysis method

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