Development of alert criteria for future volcanic unrest in Long Valley Caldera, California

Hill, D. P.

doi:10.3133/ofr90658

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…A typical pattern of large calderas, like Phlegraean Fields, Rabaul (New Guinea), Yellowstone (Wyoming), and Long Valley (California), appears to be one of episodic unrest characterized by months to years of recurring earthquake swarms and rapid inflation separated by years to decades of relative quiescence with gradual uplift or partial subsidence ( Hill, 1990). However, none of the unrest episodes in these calderas has culminated in a magmatic eruption ( Newhall and Dzurisin, 1988).…”

Section: Discussionmentioning

confidence: 99%

The volcanoseismic crisis of 1996–97 in Nisyros, SE Aegean Sea, Greece

et al. 1998

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After a repose time of several years, intense, shallow seismic activity started at the end of 1995 in the volcanic region of Nisyros island. By the end of October 1997, hundreds of shocks had been recorded, the largest one being that of 27 August 1997 with Ms = 5.3. The activity is highly clustered in space and time, while the b‐value of the magnitude‐frequency relation was found equal to 1.67. Similar b‐values were determined from Nisyros seismicity registered between 1911 and 1980 and from a 1997 microearthquake dataset. These properties seem to be a characteristic of the region, rather than precursor of a forthcoming eruption and make Nisyros similar to other large calderas of the Earth where the episodic unrest with local swarm‐like earthquake sequences separated by months or years is a typical pattern that do not culminate in a volcanic eruption.

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Section: Discussionmentioning

confidence: 99%

The volcanoseismic crisis of 1996–97 in Nisyros, SE Aegean Sea, Greece

et al. 1998

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“…Nisyros' seismicity has shown episodic unrest with local swarm-like earthquake sequences separated by months and years of quiescence. This is a characteristic which makes Nisyros comparable to other large calderas, such as Campi Flegrei (Naples, Italy), Rabaul (Papua, New Guinea), Yellowstone (WY, USA), and Long Valley (CA, USA) [41]. At the end of 1995, the Nisyros volcanic region entered an episodic unrest period with long-lasting, highly clustered earthquake activity, which seems to be a characteristic of the region rather than a precursor of a volcanic eruption [40].…”

Section: Introductionmentioning

confidence: 90%

The Hydrothermal Vent Field at the Eastern Edge of the Hellenic Volcanic Arc: The Avyssos Caldera (Nisyros)

et al. 2021

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Almost three-quarters of known volcanic activity on Earth occurs in underwater locations. The presence of active hydrothermal vent fields in such environments is a potential natural hazard for the environment, society, and economy. Despite its importance for risk assessment and risk mitigation, the monitoring of volcanic activity is impeded by the remoteness and the extreme conditions of many underwater volcanoes. The morphology and the activity of the submarine caldera, Avyssos, at the northern part of Nisyros volcano in the South Aegean Sea (Greece), were studied using a remotely operated underwater vehicle. The recorded time series of temperature and conductivity over the submarine volcano have been analyzed in terms of the Generalized Moments Method. This type of analysis can be used as an indicator for the state of activity of a submarine volcano. Here, we expand the work conducted for the first time in 2018. We present the findings of the geological exploration and the mathematical analysis, obtained from the data collected in October 2010. The temperature and conductivity time series show minor fluctuations in a rather stable environment. Based on these results, the impact of developing appropriate mechanisms and policies to avoid the associated natural hazard is expected to be important.

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Bibliography of literature pertaining to Long Valley Caldera and associated volcanic fields

Ewert¹,

Harpel²,

Brooks³

et al. 2011

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Lake Volcanic Field, and the deposits from these volcanoes, or if they contained regional geological information that would be important to a researcher investigating aspects of the geology and geophysics of the area. Because of the relatively small number of references prior to 1940, we took a broader view of relevance within the older literature. Whereas, we took a more restrictive view of relevancy for the post-1940 references.

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Development of alert criteria for future volcanic unrest in Long Valley Caldera, California

Cited by 3 publications

References 4 publications

The volcanoseismic crisis of 1996–97 in Nisyros, SE Aegean Sea, Greece

The volcanoseismic crisis of 1996–97 in Nisyros, SE Aegean Sea, Greece

The Hydrothermal Vent Field at the Eastern Edge of the Hellenic Volcanic Arc: The Avyssos Caldera (Nisyros)

Bibliography of literature pertaining to Long Valley Caldera and associated volcanic fields

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