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  • 1
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    Increment in the volcanic unrest and number of eruptions after the 2012 large earthquakes sequence in Central America (2021)
    Nature PG
    Details
    Publication Date: 2021-12-13
    Description: Understanding the relationship cause/effect between tectonic earthquakes and volcanic eruptions is a striking topic in Earth Sciences. Volcanoes erupt with variable reaction times as a consequence of the impact of seismic waves (i.e. dynamic stress) and changes in the stress field (i.e. static stress). In 2012, three large (Mw ≥ 7.3) subduction earthquakes struck Central America within a period of 10 weeks; subsequently, some volcanoes in the region erupted a few days after, while others took months or even years to erupt. Here, we show that these three earthquakes contributed to the increase in the number of volcanic eruptions during the 7 years that followed these seismic events. We found that only those volcanoes that were already in a critical state of unrest eventually erupted, which indicates that the earthquakes only prompted the eruptions. Therefore, we recommend the permanent monitoring of active volcanoes to reveal which are more susceptible to culminate into eruption in the aftermath of the next large-magnitude earthquake hits a region.
    Description: Published
    Description: 22417
    Description: 5V. Processi eruttivi e post-eruttivi
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Electronic Resource
    Electronic Resource
    A gravity survey on Volcano Huzi, Japan by means of a Worden gravimeter (1960)
    Springer
    Pure and applied geophysics 45 (1960), S. 1-12 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Observations and reductions of the gravimeter survey on Volcano Huzi are fully described. The survey was accompanied by various inevitable difficulties but the accuracy of calculating the Bouguer anomalies is kept high enough to bear volcanological discussion. The results are rather suggestive to the theory of caldera-formation. Comparison with the gravity anomaly on the volcanic islands in the middle of the ocean is also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996569
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gravity Survey on the Kuttyaro Caldera by means of a Worden Gravimeter (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 739-740 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At present, gravity measurement on the water is very difficult. Fortunately, we were able to use a Worden gravimeter on the surface of Lake Kuttyaro because it freezes hard in winter. It is noteworthy that the free air reduction and the Bouguer correction are uniform over the lake, and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183739a0
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  • 4
    Electronic Resource
    Electronic Resource
    Gravity Survey on the Aira Caldera, Kyusyu, Japan (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 966-967 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Aira caldera, in the southern part of Kyusyu, Japan, is one of the biggest in the world, measuring about 20 km. in diameter. It occupies the innermost part of Kagosima Bay, and an active volcano, Sakurazima (1,118 m. high), stands on its southern circumference. This volcano came into existence ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/191966a0
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  • 5
    Electronic Resource
    Electronic Resource
    Pozzuoli Event in 1970 (1971)
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 532-533 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A crustal upheaval near Naples in March 1970 was unusual in not being accompanied by noticeable earthquakes. This could be interpreted in terms of the visco-elasticity of the Earth's ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/229532a0
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  • 6
    Electronic Resource
    Electronic Resource
    Microgravity and height changes caused by volcanic activity: Four (1989)
    Springer
    Bulletin of volcanology 51 (1989), S. 333-345 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Microgravity measurements and levelling surveys on volcanoes are not always easy to make, but are useful for studying volcanic processes quantitatively. Gravity changes associated with volcanic activity are not always significant. Precision of microgravity measurements depend critically on the procedures adopted, and those applied in the present paper are described. Levelling technique is now orthodox, and some empirical laws relating ground deformation to volcanic activity are deduced from the accumulated data. Gravity changes occur at the same time and places as ground deformations. The relationship between microgravity and height changes are discussed from the standpoint of analyzing the data obtained on volcanoes. The observational results obtained on four volcanoes in Japan are separately analyzed because each volcano exhibits different patterns of gravity changes and deformations. During the 1977–1982 activity of Usu volcano, deformation was accompanied by microgravity changes frequently observed at a particular benchmark at the base of the volcano for about five years. The gravity changes prove to be not a direct effect of magma movements but to be caused by the deformations of ground strata and aquifers around the benchmark. The 1983 eruption of Miyakejima volcano was associated with local gravity changes around the eruptive fissures due to magma intrusion which was approximately modelled. Similarly the 1986 eruption of Ooshima volcano caused gravity changes on the volcano, but these were poorly correlated with elevation changes and their origins were not uniquely interpreted. To detect gravity changes associated with the activity of Sakurajima volcano, an equigravity point was selected at the north of the volcano besides the gravity points on and around the volcano itself. The probable gradual accumulation of magmas beneath the volcano for eight years is substantiated by observed microgravity and elevation changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01056895
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  • 7
    Electronic Resource
    Electronic Resource
    Magma eruption rates of Merapi volcano, Central Java, Indonesia during one century (1890–1992) (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 111-116 
    Details
    ISSN: 1432-0819
    Keywords: Magma eruption rates ; Conduit length ; Viscosity ; Merapi volcano, Java
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The magma eruption rates of Merapi volcano form 1890 to 1992 are re-examined chronologically. For this volcano, movements of extruded lavas and domes as well as their extrusions are important because they control the modes of the subsequent activities and cause nuées ardentes and lahars. The monthly eruption rates varied widely, but the cumulative volume of lavas has increased linearly and is expressed as 0.1x106 m3/month. The magma production rate of this volcano may have been constant for these 100 years. Recurrent excessive effusion of lavas is tentatively interpreted by assuming a magma reservoir. The averaged eruption rate is small in comparison with other volcanoes such as Nyramuragia, Kilauea and Vesuvio. However, it is remarkable that the activity has been continuous for these 100 years and the total amount of lava discharged during this period reached more than 108 m3. A simple model for the formation of the 1992 lava dome is presented. The viscosity of the lavas is probably between 106 and 107 P and the length of the magma conduit is probably less than 10 km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301401
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  • 8
    Electronic Resource
    Electronic Resource
    Seismic energy releases from volcanoes (1988)
    Springer
    Bulletin of volcanology 50 (1988), S. 1-13 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Seismic energy release during the precursory, eruptive and declining stages of volcanic activities provides various information about the mechanisms of volcanic eruptions and the temporary developments of their activities. Hitherto the energy release patterns from precursory earthquake swarms were used to predict the eruption times, especially of andesitic or dacitic volcanoes. In this paper the discussion is expanded to quantify the total amount of seismic energy released at the threshold of volcanic eruptions, with reference to the results observed at several volcanoes. The results generally indicate that the cumulative seismic energy release from the precursory earthquake swarms exceed 1017∼18ergs before eruptions at any andesitic or dacitic volvanoes. This allows the seismic efficiency, or the ratio of energy radiated seismically, and the energy required for the volumetric expansion to be estimated by incorporating available deformation data with the seismic data. The dependency of seismic efficiency on the type of volcanic activity, i. e. non-explosive outbreaks, phreatic and magmatic eruptions, dome formation, etc., was evaluated from observations at a few volcanoes that provided a variety of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01047504
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  • 9
    Electronic Resource
    Electronic Resource
    Magma eruption rates of Merapi volcano, Central Java, Indonesia during one century (1890–1992) (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 111-116 
    Details
    ISSN: 1432-0819
    Keywords: Key words Magma eruption rates ; Conduit length ; Viscosity ; Merapi volcano ; Java
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The magma eruption rates of Merapi volcano form 1890 to 1992 are re-examined chronologically. For this volcano, movements of extruded lavas and domes as well as their extrusions are important because they control the modes of the subsequent activities and cause nuées ardentes and lahars. The monthly eruption rates varied widely, but the cumulative volume of lavas has increased linearly and is expressed as 0.1×106 m3/month. The magma production rate of this volcano may have been constant for these 100 years. Recurrent excessive effusion of lavas is tentatively interpreted by assuming a magma reservoir. The averaged eruption rate is small in comparison with other volcanoes such as Nyramuragia, Kilauea and Vesuvio. However, it is remarkable that the activity has been continuous for these 100 years and the total amount of lava discharged during this period reached more than 108 m3. A simple model for the formation of the 1992 lava dome is presented. The viscosity of the lavas is probably between 106 and 107 P and the length of the magma conduit is probably less than 10 km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301401
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  • 10
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    Crustal deformation caused by the 1914 eruption of Sakurajima volcano, Japan and its secular changes (1986)
    Elsevier
    Details
    Publication Date: 1986-12-01
    Print ISSN: 0377-0273
    Electronic ISSN: 1872-6097
    Topics: Geosciences
    Published by Elsevier
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