Magnitude–frequency distribution of volcanic explosion earthquakes

Nishimura, Takeshi; Iguchi, Masato; Hendrasto, Mohammad; Aoyama, Hiroshi; Yamada, Taishi; Ripepe, Maurizio; Genco, Riccardo

doi:10.1186/s40623-016-0505-2

Cited by 18 publications

(17 citation statements)

References 22 publications

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“…Spurr, Alaska, in the USA, which is interpreted as being of hydrothermal origin, and is one order of magnitude less than that observed during the sub-Plinian eruption at the same volcano. The estimated characteristic amplitude is also of the same order of magnitude as the volcanic explosion earthquakes at Stromboli (Nishimura et al 2016(Nishimura et al , 2017, which were related to the behavior of a gas slug in the magma column (e.g., Ripepe and Gordeev 1999).…”

Section: Duration-amplitude Distribution Of the Volcanic Tremormentioning

confidence: 76%

Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Yukutake

Honda

Harada

et al. 2017

Earth Planets Space

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In the present study, we analyze the seismic signals from a continuous volcanic tremor that occurred during a small phreatic eruption of the Hakone volcano, in the Owakudani geothermal region of central Japan, on June 29, 2015. The signals were detected for 2 days, from June 29 to July 1, at stations near the vents. The frequency component of the volcanic tremors showed a broad peak within 1-6 Hz. The characteristics of the frequency component did not vary with time and were independent of the amplitude of the tremor. The largest amplitude was observed at the end of the tremor activity, 2 days after the onset of the eruption. We estimated the location of the source using a cross-correlation analysis of waveform envelopes. The locations of volcanic tremors are determined near the vents of eruption and the surface, with the area of the upper extent of an open crack estimated using changes in the tilt. The durationamplitude distribution of the volcanic tremor was consistent with the exponential scaling law rather than the power law, suggesting a scale-bound source process. This result suggests that the volcanic tremor originated from a similar physical process occurring practically in the same place. The increment of the tremor amplitude was coincident with the occurrence of impulsive infrasonic waves and vent formations. High-amplitude seismic phases were observed prior to the infrasonic onsets. The time difference between the seismic and infrasonic onsets can be explained assuming a common source located at the vent. This result suggests that both seismic and infrasonic waves are generated when a gas slug bursts at that location. The frequency components of the seismic phases observed just before the infrasonic onset were generally consistent with those of the tremor signals without infrasonic waves. The burst of a gas slug at the surface vent may be a reasonable model for the generation mechanism of the volcanic tremor and the occurrence of impulsive infrasonic signals. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Duration-amplitude Distribution Of the Volcanic Tremormentioning

confidence: 76%

Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Yukutake

Honda

Harada

et al. 2017

Earth Planets Space

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“…We conducted temporal seismic and infrasound observation at Lokon‐Empung in Indonesia during the period of 2012–2013 (Figure S1a) [ Nishimura et al ., ; Yamada et al ., ]. Figure shows an example of seismic and infrasound waveforms accompanying a Vulcanian eruption on 28 November 2012.…”

Section: Datamentioning

confidence: 99%

Volcanic eruption volume flux estimations from very long period infrasound signals

Yamada

Aoyama

Nishimura

et al. 2017

Geophysical Research Letters

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We examine very long period infrasonic signals accompanying volcanic eruptions near active vents at Lokon‐Empung volcano in Indonesia, Aso, Kuchinoerabujima, and Kirishima volcanoes in Japan. The excitation of the very long period pulse is associated with an explosion, the emerging of an eruption column, and a pyroclastic density current. We model the excitation of the infrasound pulse, assuming a monopole source, to quantify the volume flux and cumulative volume of erupting material. The infrasound‐derived volume flux and cumulative volume can be less than half of the video‐derived results. A largely positive correlation can be seen between the infrasound‐derived volume flux and the maximum eruption column height. Therefore, our result suggests that the analysis of very long period volcanic infrasound pulses can be helpful in estimating the maximum eruption column height.

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“…The ability to meaningfully interpret b-value analysis provides important information about the causes of eruptions of Shinmoe-dake. We used only VT earthquakes in this study and described the overall features in terms of the spatial and temporal trends in b-value; however, it is expected that further physical properties of the magma plumbing system, which indirectly control eruptive activity in and around Shinmoe-dake, could be obtained by investigating the magnitude-frequency distributions of low-frequency earthquakes, tremor (Benoit et al 2003), and explosive earthquakes (Nishimura et al 2016), in addition to analysis of b-values of VT earthquakes. Such an approach from statistical seismology could become a useful tool for assessing the potential of activity in the near future, in and around Shinmoe-dake.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal distributions of b-value in and around Shinmoe-dake, Kirishima volcano, Japan

Chiba

Shimizu

2018

Earth Planets Space

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Kirishima Shinmoe-dake, located in southern Kyushu, Japan, erupted in October 2017 after 6 years of quiescence. Analysis of volcanic gas indicates that magma upwelling from depth affected this eruption. Shinmoe-dake's recent eruptive history also includes phreatic eruptions in 2008 and 2010 and a magmatic eruption in 2011. We examined spatial and temporal variations in b-values to investigate the magma plumbing system in and around Shinmoe-dake and its possible effects on unrest. A region with relatively high b-values (b = 1.5) is located at depths of − 1.0 to 2.0 km below sea level beneath the summit. It is likely that this anomalous region was generated by crustal heterogeneity, as it colocates to pressure sources. We investigated temporal variations in b-values from January 2007 to October 2017 in two regions: beneath the summit and 7.0-8.0 km northwest of the summit; the latter corresponds to the region above the locations of pressure sources related to the 2011 and 2017 eruptions. An increase in the b-value (b = 1.4) beneath the summit was observed beginning in early 2009, followed by a subsequent decrease (b = 0.9) immediately before and during the 2011 eruption. Similar temporal changes in the b-value were also observed beneath the summit before the 2017 eruption. From these results, we can infer that the increase and subsequent decrease in b-value express the activation of small cracks, due to the generation of hydrothermal fluids, and the development of cracks, which produces higher magnitude earthquakes, respectively. Meanwhile, a decrease in b-value (b = 0.6) was observed in the region northwest of the summit during the 2011 and 2017 eruptions. Thus, it is possible that the decreases in b-value in this region result from the activation of small cracks and the development of these crack systems and/or a change in the stress field near the magma chamber, which produce higher magnitude earthquakes. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Magnitude–frequency distribution of volcanic explosion earthquakes

Cited by 18 publications

References 22 publications

Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Volcanic eruption volume flux estimations from very long period infrasound signals

Spatial and temporal distributions of b-value in and around Shinmoe-dake, Kirishima volcano, Japan

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