Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand

Park, Iseul; Jolly, Arthur D.; Lokmer, Ivan; Kennedy, Ben

doi:10.1186/s40623-020-01224-z

Cited by 22 publications

(26 citation statements)

References 41 publications

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“…Note that RHF seismicity can be distinguished from VT seismicity by the strongly peaked spectra of the former, which are distinct from the broad spectra of VT event types. VLP events have the lowest frequencies for local Whakaari/White Island seismicity (~ 0.1 to 0.03 Hz, Park et al 2020).…”

Section: Analysis Of Discrete Earthquakesmentioning

confidence: 99%

“…The families are characterized by 'mirror image' reverse waveform polarities and, therefore, possibly genetically related. The details of this analysis are presented in Park et al (2020) (this issue).…”

Section: Analysis Of Discrete Earthquakesmentioning

confidence: 99%

“…In addition, after more than 2 years of quiescence, a multi-pulse phreatic eruption occurred on April 27, 2016 (Kilgour et al 2019). The most recent eruption occurred on 9 December 2019 and tragically resulted in fatalities (Park et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018

Caudron

Girona

Jolly

et al. 2021

Earth Planets Space

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The Whakaari/White Island volcano, located ~ 50 km off the east coast of the North Island in New Zealand, has experienced sequences of quiescence, unrest, magmatic and phreatic eruptions over the last decades. For the last 15 years, seismic data have been continuously archived providing potential insight into this frequently active volcano. Here we take advantage of this unusually long time series to retrospectively process the seismic data using ambient noise and tremor-based methodologies. We investigate the time (RSAM) and frequency (Power Spectral Density) evolution of the volcanic tremor, then estimate the changes in the shallow subsurface using the Displacement Seismic Amplitude Ratio (DSAR), relative seismic velocity (dv/v) and decorrelation, and the Luni-Seismic Correlation (LSC). By combining our new set of observations with the long-term evolution of earthquakes, deformation, visual observations and geochemistry, we review the activity of Whakaari/White Island between 2007 and the end of 2018. Our analysis reveals the existence of distinct patterns related to the volcano activity with periods of calm followed by cycles of pressurization and eruptions. We finally put these results in the wider context of forecasting phreatic eruptions using continuous seismic records.

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Section: Analysis Of Discrete Earthquakesmentioning

confidence: 99%

Section: Analysis Of Discrete Earthquakesmentioning

confidence: 99%

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A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018

Caudron

Girona

Jolly

et al. 2021

Earth Planets Space

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“…For the observation period, we detected only < 10 VTs by a STA/ LTA (short-term average/long-term average; Trnkoczy 2009) detection algorithm. To identify subsurface LP and VLP activity indicating volcanic fluid movement beneath the Lake Voui, we applied both the STA/LTA and a waveform semblance method (e.g., Kawakatsu et al 2000;Jolly et al 2018;Park et al 2020) to the continuous seismic data, but no significant events (semblance < 0.2) were detected.…”

Section: Seismic Tremor Source Locationmentioning

confidence: 99%

Seismo-acoustic characterisation of the 2018 Ambae (Manaro Voui) eruption, Vanuatu

et al. 2021

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A new episode of unrest and phreatic/phreatomagmatic/magmatic eruptions occurred at Ambae volcano, Vanuatu, in 2017–2018. We installed a multi-station seismo-acoustic network consisting of seven 3-component broadband seismic stations and four 3-element (26–62 m maximum inter-element separation) infrasound arrays during the last phase of the 2018 eruption episode, capturing at least six reported major explosions towards the end of the eruption episode. The observed volcanic seismic signals are generally in the passband 0.5–10 Hz during the eruptive activity, but the corresponding acoustic signals have relatively low frequencies (< 1 Hz). Apparent very-long-period (< 0.2 Hz) seismic signals are also observed during the eruptive episode, but we show that they are generated as ground-coupled airwaves and propagate with atmospheric acoustic velocity. We observe strongly coherent infrasound waves at all acoustic arrays during the eruptions. Using waveform similarity of the acoustic signals, we detect previously unreported volcanic explosions at the summit vent region based on constant-celerity reverse-time-migration (RTM) analysis. The detected acoustic bursts are temporally related to shallow seismic volcanic tremor (frequency content of 5–10 Hz), which we characterise using a simplified amplitude ratio method at a seismic station pair with different distances from the vent. The amplitude ratio increased at the onset of large explosions and then decreased, which is interpreted as the seismic source ascent and descent. The ratio change is potentially useful to recognise volcanic unrest using only two seismic stations quickly. This study reiterates the value of joint seismo-acoustic data for improving interpretation of volcanic activity and reducing ambiguity in geophysical monitoring.

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“…Recent volcanic eruptions have resulted in a signi cant number of fatalities, evacuations and economic loss (e.g., White Island, New Zealand in 2019 (Park et al 2020;Cao et al 2020); Fuego, Guatemala in 2018 (Charbonnier et al 2019;De Angelis et al 2018); Hawaii, U.S.A. in 2018 (Feng et al 2020;Neal et al 2019); Anak Krakatoa, Indonesia in 2018 (Heidarzadeh et al 2020); Sinabung, Indonesia in 2014 (Chat eld et al 2014); Ontake, Japan in 2014 (Maeno et al 2016) and Eyjafjallajökull, Iceland in 2010 (Langmann et al 2012)). It is estimated that >500 million people live in areas with some volcanic risk (Martí 2017;Auker et al 2013) and large volcanic eruptions can affect our interconnected world in numerous ways.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic multi – hazard assessment at an active but under-monitored volcano: Ceboruco, Mexico

Constantinescu

Zuccoloto

Ferrés

et al. 2021

Preprint

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We conduct a probabilistic volcanic hazard assessment for Ceboruco volcano (Mexico) using PyBetVH, an e-tool based on the Bayesian event tree (BET) methodology. We use available information about the volcano, including eruptive history, numerical and theoretical models, to generate probability maps. Our hazard assessment accounts for the variability of eruption types expected at Ceboruco and the hazardous volcanic phenomena these eruptions generate. We create a generic event tree for Ceboruco to account for magmatic and amagmatic activity. For a magmatic eruption, we choose three scenarios: i) small (effusive), ii) medium (vulcanian/subPlinian) and iii) large (Plinian) based on the Holocene history of the volcano; with their related hazardous phenomena: ballistics, tephra fallout, pyroclastic density currents, lahars and lava flows. Despite numerous eruptions in the latest Holocene and efforts by several university and government groups to create and sustain a monitoring network, Ceboruco remains under-monitored, meaning that it is intermittently rather than continuously monitored by dedicated groups. With no consistent monitoring data available, we look at the geology and the eruptive history to inform our prior models. We estimate the probability of a magmatic eruption within the next time window (1 year) of ~ 0.002. We show how the BET creates higher probabilities in the absence of monitoring data. That is, there is a cost in terms of higher probabilities and higher uncertainties for having not yet developed a sustained volcano monitoring network. We present absolute probability maps (unconditional in terms of eruption size and vent location) for a magmatic eruption at Ceboruco volcano. With PyBetVH we estimate and visualize the uncertainties associated with each hazard map. Our intent is that hazard maps and uncertainties will be useful to local authorities who need to understand the hazard maps when considering the development of long-term urban and land-use planning and short-term crisis management strategies, and to the scientific community in their efforts to sustain monitoring of this active volcano.

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Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand

Cited by 22 publications

References 41 publications

A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018

A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018

Seismo-acoustic characterisation of the 2018 Ambae (Manaro Voui) eruption, Vanuatu

Probabilistic multi – hazard assessment at an active but under-monitored volcano: Ceboruco, Mexico

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