Seismicity of Ruapehu volcano, New Zealand, 1971–1996: a review

Sherburn, S.; Bryan, Carol J.; Hurst, Arthur F.; Latter, J. H.; Scott, Bradley J.

doi:10.1016/s0377-0273(99)00014-1

Cited by 47 publications

(23 citation statements)

References 33 publications

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Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

“…During the 1971–1996 period, the relations between recorded seismicity and volcanic activity at Ruapehu depended on the style and scale of eruptions [ Sherburn et al , 1999]. Although every heating phase was accompanied by tremor emission [ Dibble , 1974; Sherburn et al , 1999], volcano‐tectonic earthquakes were not usually observed. The heating phases are thus not the result of hydrofracturing at depth, as observed in Poas [ Rowe et al , 1992] and in Kelut crater lakes [ Lesage and Surono , 1995; Vandemeulebrouck et al , 2000] but appear to be a change of flow regime in an open hydrothermal system.…”

Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

“…Tremor observed on Ruapehu generally had one or two sharp frequency peaks, and a normal dominant frequency between 1.8 and 2.3 Hz with very little second harmonic energy [ Hurst and Sherburn , 1993]. A spectral peak around 6–7 Hz has been observed since 1993, and was attributed to a shallow source near the lake [ Sherburn et al , 1999]. From 1985 to 1988, a shift from 2Hz to 3Hz of the tremor peak frequency was observed during heating phases and was attributed to additional heat input to the lake [ Sherburn and Hurst , 1988].…”

Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

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Analogue modeling of instabilities in crater lake hydrothermal systems

et al. 2005

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[1] We carried out analogue experiments on two-phase boiling systems, using a porous vertical cylinder, saturated with water. The base of the cylinder was heated, and the top was cooled, as in a natural hydrothermal system. Previous work had shown that once the two-phase zone reached a certain level, thermal instabilities would develop. We made measurements of the acoustic energy related to boiling, and we found that high levels of acoustic noise were associated with the part of the cycle in which there was upward water movement. We repeated our experiments with a cooling water tank at the top of the system, representing a crater lake. This showed that periodic thermal instabilities still developed in this situation. We then compared our analogue measurements to two natural systems known to exhibit periodic behavior. There is good agreement between the thermal and acoustic cycling seen in our model and the observations made at Inferno Crater Lake in the Waimangu Geothermal area, New Zealand, whose level cycles by nearly 10 m, with a typical period of 38 days. Particularly notable is how in both systems high levels of acoustic noise are associated with rising water level. The much larger Ruapehu Crater Lake, also in New Zealand, cycled with a period of several months to a year for over a decade prior to the 1995 eruption. Strong acoustic and seismic energy usually occurred just before the lake temperature started to rise. This suggests a slightly different model, in which the increasing two-phase flow zone triggers more general convection once it reaches the base of the lake.

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Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

Section: Application To the Ruapehu Crater Lake New Zealandmentioning

confidence: 99%

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Analogue modeling of instabilities in crater lake hydrothermal systems

et al. 2005

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“…Precursors to eruptions in the region are rare [ Sherburn et al , ], so different approaches have been examined. Seismic velocity changes measured from ambient noise cross correlation [ Mordret et al , ], temporal variation of far‐field seismicity [ Hurst and McGinty , ], temporal variation in seismic attenuation [ Titzschkau et al , ], changes in anisotropy, and b values of nearby swarm areas [ Keats et al , ; Miller and Savage , ; Gerst and Savage , ; Johnson and Savage , ] have all been suggested as being related to changes in stress or fluid content and have all been correlated with activity retrospectively.…”

Section: Introductionmentioning

confidence: 99%

Shear wave automatic picking and splitting measurements at Ruapehu volcano, New Zealand

et al. 2015

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Automatic shear wave picking and shear wave splitting measurement tools (Multiple Filter Automatic Splitting Technique (MFAST)) are combined to build a near-real time application for monitoring local stress around volcanoes. We use an adapted version of Diehl et al. (2009) on seismograms provided by the New Zealand GeoNet network and having an origin time and location based only on P picks. The best automatic picks are processed by MFAST, which computes the corresponding shear wave fast direction ϕ, and splitting delay time δt, interpreted, respectively, as the principal direction of stress underneath the station and the amount of anisotropy integrated along the wave raypath. We applied our system to 9 years of local earthquakes recorded at seven stations around Ruapehu volcano, New Zealand. Results are compared against MFAST measurements from manual S picks when available and show less than 10°difference for 90% of ϕ measurements and less than 0.05 s difference for 95% of δt measurements. Shear wave splitting from automatic S arrival times are slightly more consistent than those from manual arrival times. At some stations, two populations of delay times occur, which depend upon computed initial polarization. This may be caused in part by cycle skipping, an artifact usually associated with monochromatic signals. However, spatial consistency in the behavior suggests a physical cause as well, such as focal mechanisms varying with earthquake source location or a spatially varying near-source anisotropic region. The numbers of events in each population group vary over time, possibly related to activity at Ruapehu volcano.

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“…The most recent large volcanic eruptions at Mount Ruapehu occurred in 1988 and 1995/96 (15). Local earthquakes within the shear-wave window (16,17) were analyzed.…”

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confidence: 99%

Changes in Seismic Anisotropy After Volcanic Eruptions: Evidence from Mount Ruapehu

Miller

Savage

2001

Science

120

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The eruptions of andesite volcanoes are explosively catastrophic and notoriously difficult to predict. Yet changes in shear waveforms observed after an eruption of Mount Ruapehu, New Zealand, suggest that forces generated by such volcanoes are powerful and dynamic enough to locally overprint the regional stress regime, which suggests a new method of monitoring volcanoes for future eruptions. These results show a change in shear-wave polarization with time and are interpreted as being due to a localized stress regime caused by the volcano, with a release in pressure after the eruption.

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Seismicity of Ruapehu volcano, New Zealand, 1971–1996: a review

Cited by 47 publications

References 33 publications

Analogue modeling of instabilities in crater lake hydrothermal systems

Analogue modeling of instabilities in crater lake hydrothermal systems

Shear wave automatic picking and splitting measurements at Ruapehu volcano, New Zealand

Changes in Seismic Anisotropy After Volcanic Eruptions: Evidence from Mount Ruapehu

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