The 2011 eruptive activity of Shinmoedake volcano, Kirishimayama, Kyushu, Japan—Overview of activity and Volcanic Alert Level of the Japan Meteorological Agency—

Kato, Koji; Yamasato, Hitoshi

doi:10.5047/eps.2013.05.009

Cited by 30 publications

(24 citation statements)

References 8 publications

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“…JMA raised the volcanic alert level (Kato and Yamasato, 2013) from 2 to 3 at 18h of 26 January 2011 and access was restricted within 2 km from the crater center. After due consultation with local municipalities, the limit area was expanded under the same alert level from 2 to 3 km on 31 January when the lava dome filled the crater, and from 3 to 4 km on 1 February when ballistic blocks fell 3.2 km from the crater center.…”

Section: Crisis Managementmentioning

confidence: 99%

The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan

et al. 2013

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The climactic phase of the 2011 eruption at Shinmoe-dake was a mixture of subplinian and vulcanian eruptive events, successive lava accumulation (lava dome) within the crater, and repetition of vulcanian events after the dome growth. It was preceded by inflation and elevated seismicity for about one year and by phreatomagmatic explosions of one week before. Small pyroclastic flows and ash-cloud surges formed during the subplinian events, when the eruption column reached the highest level and the vent was widened. A lava dome, which was extruded close to the vent of subplinian events, grew by swelling upward and filling the crater. After the vent was covered by the lava, an intense vulcanian event occurred from the base of the dome and the swelled dome became deflated. After that, vulcanian events were repeated for three months. Simultaneous eruption styles in the crater (vulcanian events, continuous ash emission and dome growth) and some phreatomagmatic events in the vulcanian stage probably are due to a complex upper-conduit system developed in water-saturated country rock.

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Section: Crisis Managementmentioning

confidence: 99%

The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan

et al. 2013

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“…Some observatories also tie in monitoring thresholds and criteria to determine their alert levels. Papers that focus on more recent case studies include Kato and Yamasato ( 2013 ) that discuss the 2011 eruptive activity of Shinmoedake volcano and the challenges of not having clear precursory activity to provide an alert. García et al ( 2014 ) discus the volcanic alert system (VAS) developed during the 2011–2014 El Hierro (Canary Islands) volcanic process, focusing on the monitoring network, the software tools for analysis of the monitoring parameters, the VAL management and the assessment of hazard, providing a useful system that could be useful to others.…”

Section: An Evolution Of Volcano Alert Level Systems Globallymentioning

confidence: 99%

Volcano alert level systems: managing the challenges of effective volcanic crisis communication

Fearnley

Beaven

2018

Bull Volcanol

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Over the last four decades, volcano observatories have adopted a number of different communication strategies for the dissemination of information on changes in volcanic behaviour and potential hazards to a wide range of user groups. These commonly include a standardised volcano alert level system (VALS), used in conjunction with other uni-valent communication techniques (such as information statements, reports and maps) and multi-directional techniques (such as meetings and telephone calls). This research, based on interviews and observation conducted 2007–2009 at the five US Geological Survey (USGS) volcano observatories, and including some of the key users of the VALS, argues for the importance of understanding how communicating volcanic hazard information takes place as an everyday social practice, focusing on the challenges of working across the boundaries between the scientific and decision-making communities. It is now widely accepted that the effective use, value and deployment of information across science-policy interfaces of this kind depend on three criteria: the scientific credibility of the information, its relevance to the needs of stakeholders and the legitimacy of both the information and the processes that produced it. Translation and two-way communication are required to ensure that all involved understand what information is credible and relevant. Findings indicate that whilst VALS play a role in raising awareness of an unfolding situation, supplementary communication techniques are crucial in facilitating situational understanding of that situation, and the uncertainties inherent to its scientific assessment, as well as in facilitating specific responses. In consequence, ‘best practice’ recommendations eschew further standardisation, and focus on the in situ cultivation of dialogue between scientists and stakeholders as a means of ensuring that information, and the processes through which it is produced are perceived to be legitimate by all involved.

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“…Since both precursory and co-eruptive ground tilt changes are recorded in association with eruptions VE#2 and VE#3 ( Fig. 3), tilt events T#1-T#19 are likely to represent either aborted or otherwise unobserved eruptions, that release overpressure from the crater without ejecting significant amount of materials (Japan Meteorological Agency et al, 2011;Kato and Yamasato, 2013). This interpretation is supported by the fact that event T#9, which occurred at midnight local time on February 22, 2011, is most likely an unobserved eruption since a small amount of fresh volcanic ash was identified on the morning of February 23, 2011 (personal communication from Dr. S. Nakada).…”

Section: Short-term Gravity Signal 231 Time Series Of Absolute Gravmentioning

confidence: 99%

“…A sophisticated procedure for estimating hydrological effects on gravity when the hydrological structure around the gravity station is known was described by Kazama and Okubo (2009). As the hydrological structure around our station is not well known, we instead use an empirical tank model that assumes an instantaneous gravity response δg(t) to rainfall R(t) followed by gradual linear relaxation (Imanishi et al, 2006) according to…”

Section: Long-term Gravity Changesmentioning

confidence: 99%

Gravity variation around Shinmoe-dake volcano from February 2011 through March 2012—Results of continuous absolute gravity observation and repeated hybrid gravity measurements

et al. 2013

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We report here on continuous absolute gravity measurements made between February 2011 and March 2012 and repeated relative gravity measurements in the vicinity of Shinmoe-dake volcano, which commenced erupting in late January 2011. We find that 20 of 24 eruptive events are associated with precursory short-term gravity decreases occurring over 5-6 hours followed by quick recoveries lasting 1-2 hours. Also evident are significant long-term gravity changes arising principally from hydrological processes around the volcano, where annual precipitation exceeds 5,000 mm. To isolate the gravity signal associated with volcanic processes, we compared gravity measurements made at 15 sites in March 2011 and again in March 2012. The gravity changes and crustal deformation observed during the one year period are well explained by 6 × 10 6 m 3 inflation of a magma reservoir at a depth of 9 km and intrusion at shallower depths of a dike with dimensions of 10 km × 0.5 km × 0.5 m.

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The 2011 eruptive activity of Shinmoedake volcano, Kirishimayama, Kyushu, Japan—Overview of activity and Volcanic Alert Level of the Japan Meteorological Agency—

Cited by 30 publications

References 8 publications

The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan

The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan

Volcano alert level systems: managing the challenges of effective volcanic crisis communication

Gravity variation around Shinmoe-dake volcano from February 2011 through March 2012—Results of continuous absolute gravity observation and repeated hybrid gravity measurements

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