Broadband recording of Strombolian explosions and associated very‐long‐period seismic signals on Mount Erebus Volcano, Ross Island, Antarctica

Rowe, C. A.; Aster, R. C.; Kyle, Philip R.; Schlue, J. W.; Dibble, R. R.

doi:10.1029/98gl01622

Cited by 102 publications

(71 citation statements)

References 11 publications

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“…This has been our main hypothesis in order to emphasize that the polarization direction points towards the source (see Legrand et al [2000] for a detailed explanation). A double direction of polarization in a vertical plan has already been observed at Erebus volcano [Rowe et al, 1998;Aster et al, 2003]: the VLPTs polarization directions start at shallow depth and migrates downwards in time. At Ambrym, a double polarization direction is also observed, but not in only one vertical plane.…”

Section: Legrand Et Al: Very Long Period Tremors At Ambrym Volcano Lmentioning

confidence: 96%

“…Nevertheless, Very Long Period signals (hereafter noted VLPTs) have been observed in only a few cases, as on Aso, (Japan), where Kaneshima et al [1996] reported tremors with periods of 10-15s. VLPTs of 20s, 11 -12s and 7s have also been recorded on Erebus, Antarctica [Rowe et al, 1998;Aster et al, 2003] as well as events with periods up to 20s on Stromboli, Italy [Chouet et al, 1999].…”

Section: Introductionmentioning

confidence: 95%

“…[2] Since about ten years, broadband seismometers (0.01 to 120 s) have been largely used to record volcanic tremors, volcanic earthquakes, phreatic or magmatic explosions [e.g., Kawakatsu et al, 1992;Chouet et al, 1994;Neuberg et al, 1994;Kaneshima et al, 1996;Rowe et al, 1998]. Nevertheless, Very Long Period signals (hereafter noted VLPTs) have been observed in only a few cases, as on Aso, (Japan), where Kaneshima et al [1996] reported tremors with periods of 10-15s.…”

Section: Introductionmentioning

confidence: 99%

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Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Legrand

Rouland²,

Frogneux³

et al. 2005

Geophysical Research Letters

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A 3‐component broadband seismometer (STS‐2) has been deployed on the SW slope of Ambrym, Vanuatu, a large‐caldera volcano with two persistent lava lakes from July to November 2000. Well‐polarized Very Long Period Tremors (18–22s; VLPTs) occurred quite continuously, whereas other seismic signal with periods of 9s, 6–7s, 5s, 2.3–2.7s, 1.95s and 1s were intermittent. VLPTs signals show two clearly distinct directions pointing towards the caldera. Polarization orientations suggest two sources: the first one, and the most active, fits with the zone from which silicic lava flows erupted in 1986, in the central‐to‐eastern part of the caldera. The second one corresponds to the active zone formed by the complex Marum volcanic center and the Benbow cone, in the western part of the depression structure. The depths are estimated between 2.7–2.9 km with respect to sea level. VLPTs are interpreted as the quasi static‐displacement field of two nondestructive sources. They indicate the persistent continuing magmatic activity beneath the eastern floor of the caldera, although no volcanic activity is observed in this area, and the more obvious, but less active, corresponding to the lava lakes. These data also corroborate the complex internal structure of the Ambrym caldera, suggested by geological data and bimodal magmatism (basaltic, ∼50% SiO2, and silicic, ∼60% SiO2).

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Section: Legrand Et Al: Very Long Period Tremors At Ambrym Volcano Lmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Legrand

Rouland²,

Frogneux³

et al. 2005

Geophysical Research Letters

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“…elastostatic deformations observed in conjunction with explosions at many diverse open-vent volcanoes, e. g., Stromboli (Italy) or Erebus (Antarctica), and are thought to be associated with volumetric changes internal to the volcano edifice [Neuberg et al, 1994;Rowe et al, 1998]. Principle component VLP particle motions may point to the locus of volume change, so long as care is taken to account for oblique incidence of seismic waves at the free surface [Neuberg and Pointer, 2000].…”

Section: 1002/2014gl061310mentioning

confidence: 99%

Explosive dome eruptions modulated by periodic gas‐driven inflation

Johnson

Lyons

Andrews

et al. 2014

Geophysical Research Letters

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Volcan Santiaguito (Guatemala) "breathes" with extraordinary regularity as the edifice's conduit system accumulates free gas, which periodically vents to the atmosphere. Periodic pressurization controls explosion timing, which nearly always occurs at peak inflation, as detected with tiltmeters. Tilt cycles in January 2012 reveal regular 26 ± 6 min inflation/deflation cycles corresponding to at least~10 1 kg/s of gas fluxing the system. Very long period (VLP) earthquakes presage explosions and occur during cycles when inflation rates are most rapid. VLPs locate~300 m below the vent and indicate mobilization of volatiles, which ascend at~50 m/s. Rapid gas ascent feeds pyroclast-laden eruptions lasting several minutes and rising tõ 1 km. VLPs are not observed during less rapid inflation episodes; instead, gas vents passively through the conduit producing no infrasound and no explosion. These observations intimate that steady gas exsolution and accumulation in shallow reservoirs may drive inflation cycles at open-vent silicic volcanoes.

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“…Recent studies using broadband seismometers have shown that very-long-period volcano seismicity, with periods of 3-20 s, originates at depths of less than 1.5 km under some active volcanoes (Kawakatsu et al 1992(Kawakatsu et al , 1994Neuberg et al 1994;Kaneshima et al 1996;Cruz and Chouet 1997;Ohminato and Ereditato 1997;Rowe et al 1998). This corresponds to the depth range within which most of the volcano seismicity at Ruapehu originates.…”

Section: Very-long-period Energymentioning

confidence: 97%

Eruption-induced modifications to volcanic seismicity at Ruapehu, New Zealand, and its implications for eruption forecasting

Bryan

Sherburn

2002

Bull Volcanol

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Broadband seismic data collected on Ruapehu volcano, New Zealand, in 1994 and1998 show that the 1995-1996 eruptions of Ruapehu resulted in a significant change in the frequency content of tremor and volcanic earthquakes at the volcano. The pre-eruption volcanic seismicity was characterized by several independent dominant frequencies, with a 2 Hz spectral peak dominating the strongest tremor and volcanic earthquakes and higher frequencies forming the background signal. The post-eruption volcanic seismicity was dominated by a 0.8-1.4 Hz spectral peak not seen before the eruptions. The 2 Hz and higher frequency signals remained, but were subordinate to the 0.8-1.4 Hz energy. That the dominant frequencies of volcanic tremor and volcanic earthquakes were identical during the individual time periods prior to and following the 1995-1996 eruptions suggests that during each of these time periods the volcanic tremor and earthquakes were generated by the same source process. The overall change in the frequency content, which occurred during the 1995-1996 eruptions and remains as of the time of the writing of this paper, most likely resulted from changes in the volcanic plumbing system and has significant implications for forecasting and real-time assessment of future eruptive activity at Ruapehu.

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Broadband recording of Strombolian explosions and associated very‐long‐period seismic signals on Mount Erebus Volcano, Ross Island, Antarctica

Cited by 102 publications

References 11 publications

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Explosive dome eruptions modulated by periodic gas‐driven inflation

Eruption-induced modifications to volcanic seismicity at Ruapehu, New Zealand, and its implications for eruption forecasting

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