Three distinct regimes of volcanic tremor associated with the eruption of Shishaldin Volcano, Alaska 1999

Thompson, Glenn; McNutt, Stephen R.; Tytgat, Guy

doi:10.1007/s00445-002-0228-z

Cited by 51 publications

(34 citation statements)

References 13 publications

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“…The possibility that magma ascent rate changed at Shishaldin, such that bubbles and magma no longer rose differentially, has also been discussed by Stelling et al (2002). This model is further supported by the increase in tremor amplitude observed before the Subplinian event (Thompson et al 2002).…”

Section: Subplinian Basaltic Eruption Mechanismsmentioning

confidence: 76%

“…Similar explosions were again recorded on the pressure sensor on 22 and 23 April, at a time when D r values were escalating (Table 1). In fact, D r values calculated on 23 April were the strongest ever recorded by AVO, exceeding 43 cm 2 (Thompson et al 2002). The largest thermal anomaly recorded during the eruption was observed in AVHRR data at this time, indicating that hot material covered~25 km 2 of Shishaldin's flanks .…”

Section: Explosionsmentioning

confidence: 89%

“…Similar explosions were recorded twice more in this phase of the Shishaldin eruption -at 1:30-2:30 UTC and at 7:55-9:30 UTC on 20 April (Table 1). Each of these time periods corresponds to an increase in tremor amplitude and decrease in tremor mean frequency, as reported by Thompson et al (2002). Thompson et al coda.…”

Section: Explosionsmentioning

confidence: 94%

“…2). In the absence of visual observations to confirm the timing of events, this increase in tremor amplitude has been designated the initiation of the Subplinian eruption (Thompson et al 2002). Satellite imagery traced the development of the resulting plume from 19:45-22:30 UTC as it rose to >16 km (Schneider et al 1999).…”

Section: Eruption Onset and Chronologymentioning

confidence: 99%

“…Studies of the 1999 eruption have focused on its seismicity (Thompson et al 2002;Moran et al 2002), geology (Stelling et al 2002), appearance in satellite data and eruption response . This paper presents data from the eruption as recorded by a pressure sensor positioned on the volcano's north flank.…”

Section: Introductionmentioning

confidence: 99%

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New insights into the 1999 eruption of Shishaldin volcano, Alaska, based on acoustic data

Caplan‐Auerbach

McNutt

2003

Bulletin of Volcanology

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Section: Subplinian Basaltic Eruption Mechanismsmentioning

confidence: 76%

Section: Explosionsmentioning

confidence: 89%

Section: Explosionsmentioning

confidence: 94%

Section: Eruption Onset and Chronologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New insights into the 1999 eruption of Shishaldin volcano, Alaska, based on acoustic data

Caplan‐Auerbach

McNutt

2003

Bulletin of Volcanology

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Volcanic tremor and frequency gliding during dike intrusions at Kı̄lauea—A tale of three eruptions

Unglert

Jellinek

2015

JGR Solid Earth

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To characterize syneruptive/intrusive deviations from background volcanic tremor at Kı̄lauea, Hawai‘i, we analyze the spatial and temporal properties of broadband tremor during dike intrusions into the East Rift Zone (ERZ) in 2007 and 2011, as well as during explosive eruptive activity at Kı̄lauea's summit in 2008. Background tremor was similar for each event, and the 2008 explosions did not affect its properties. In contrast, the intrusions were accompanied by departures from this background in the form of two phases of seismicity that were separated in space and time. In both 2007 and 2011, Phase I was characterized by a quick succession of discrete events, which were most intense at the onset of intrusion near the presumed locations of the dikes intruding into the ERZ. Phase II, marked by continuous broadband tremor around the summit, followed 10–14 h later. In 2007, Phase II tremor was accompanied by a monotonic downward shift (glide) of spectral peaks between ∼0.6 and 1.5 Hz over at least 15 h. During Phase II in 2011, a gradual upward and subsequent symmetric downward glide between ∼0.6 and 6.6 Hz occurred over 5–10 h, respectively. The spectra during both phases differed from the background and 2008, as well as from each other, indicating different physical mechanisms. Phase I in 2007 and 2011 is probably related to the mechanics of dike intrusion. Phase II tremor may be characteristic for evolving magma‐bubble dynamics related to the geometry of the plumbing system and the style of magma flow.

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Tremor and its duration‐amplitude distribution at Popocatépetl volcano, Mexico

Arámbula‐Mendoza

Valdés‐González

Varley

et al. 2016

Geophysical Research Letters

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The duration‐amplitude distribution was calculated for the tremor observed at Popocatépetl volcano during episodes of activity in 2000 and 2012–2014. An exponential function was used to obtain a good fit for the duration‐amplitude distribution, and the source of volcanic tremor is probably generated by the transportation of magmatic fluids and its coupling with the host rock within the volcanic conduit. In particular, harmonic tremor has shown large amplitudes, durations, and mean values of amplitude, more than spasmodic or pulsating tremor. This is due to different generation mechanisms: in the case of harmonic tremor, it is produced during magma ascent and lava dome growth, while spasmodic and pulsating tremors are associated with fragmentation of the lava dome and gas emissions. This paper presents the duration‐amplitude distribution as a method to estimate the intensity of the tremor at Popocatépetl, a volcano with the major risk in all Mexico.

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Three distinct regimes of volcanic tremor associated with the eruption of Shishaldin Volcano, Alaska 1999

Cited by 51 publications

References 13 publications

New insights into the 1999 eruption of Shishaldin volcano, Alaska, based on acoustic data

New insights into the 1999 eruption of Shishaldin volcano, Alaska, based on acoustic data

Volcanic tremor and frequency gliding during dike intrusions at Kı̄lauea—A tale of three eruptions

Tremor and its duration‐amplitude distribution at Popocatépetl volcano, Mexico

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