Geology of Sakurajima Volcano, southern Kyushu

Fukuyama, Hiroyuki

doi:10.5575/geosoc.84.309

Cited by 21 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slopes in the study area were located at 366 to 655 m above sea level and their angles of inclination ranged from 25 to 70°. The geological features of the slopes were classified as "Recent Ejecta", "Hikinohira Lava Dome" or "Taisho I Lava Flow" [7]. Exotic grasses, such as Eragrostis curvula, Festuca rubra, F. arundinacea, C. dactylon, A. alba and D. glomerata, have been introduced in this area for use as cover plants for erosion control on cut slopes using a bioengineering technique known as the Slurry Application Method, which is a way employed for aerial seeding work.…”

Section: Study Sitementioning

confidence: 99%

Vegetation Succession on Cut Slopes Covered With Exotic Grasses for Erosion Control, Mt. Sakurajima

Kondo¹

2016

geomate

View full text Add to dashboard Cite

ABSTRACT:The utilization of exotic grasses as cover plants for erosion control has received considerable attention in recent years, particularly because these exotic grasses have the potential to become invasive. This study examined succession of exotic grass communities that have been established on the cut slopes of the volcano, Mt. Sakurajima. The results showed that although the exotic grasses, such as Cynodon dactylon, Festuca rubra and Dactylis glomerata, that have been used for erosion control on the cut slopes were dominant for the first two years, marked decreases were observed as the native herbaceous plant, Miscanthus sinensis, became dominant after three years. By the sixth year, all of the exotic grasses vanished completely. This high rate of succession would result in the suppression of exotic grass dispersal on Mt. Sakurajima. It was also suggested that the chemical properties of volcanic soils, and the bio-engineering technique employed on Mt. Sakurajima may have facilitated this high rate of succession.

show abstract

Section: Study Sitementioning

confidence: 99%

Vegetation Succession on Cut Slopes Covered With Exotic Grasses for Erosion Control, Mt. Sakurajima

Kondo¹

2016

geomate

View full text Add to dashboard Cite

show abstract

“…Sakurajima is an active stratovolcano in southern Kyushu, Japan, located on the southern rim of the Aira caldera within the Kagoshima graben (Fukuyama 1978;Aramaki 1984). The Aira caldera forms part of the northern end of the Ryukyu arc, which exists due to the subduction of the Philippine Sea Plate (PSP) below the Eurasian Plate (Fukuyama 1978), as shown in Fig. 1.…”

Section: Geological Setting and Previous Geochemical Studiesmentioning

confidence: 99%

Using high-resolution Pb isotopes to unravel the petrogenesis of Sakurajima volcano, Japan

2020

View full text Add to dashboard Cite

Sakurajima volcano on the rim of Aira caldera erupts daily, threatening the major nearby population centre of Kagoshima. Before 1955, eruptions have typically consisted of intermittent Plinian and effusive activity, but since 1955, frequent Vulcanian explosions have occurred, indicating a change in pre-eruptive processes. High-resolution Pb isotopes are used here to constrain the components, including crustal assimilants, and petrogenetic processes contributing to the composition of both pre and post 1955 magmas. Sakurajima eruptive products have more radiogenic Pb (206 Pb/ 204 Pb = 18.40-18.42) than nearby Sumiyoshiike basalts (206 Pb/ 204 Pb = 18.24), a proxy for the primitive magma feeding the Sakurajima-Aira system. Sakurajima samples lie along a mixing line between these basalts and locally exposed crustal compositions. Their Pb isotopes are consistent with addition of~5% average crustal melt to the primitive basaltic magma. The narrow range of Pb isotope ratios, despite variable SiO 2 contents (56.6-72.3 wt%), suggests that the final erupted magmas are derived from fractional crystallization of a mafic precursory magma displaying relatively consistent levels of crustal contamination. Andesites erupted between 4-3.7 ka and the 1995 eruption are contaminated to a greater extent, indicating that magmas with distinct compositions can feed phases of activity or individual eruptions. Post 1955 andesitic pyroclastics have lower SiO 2 and higher MgO than older lavas, yet equivalent Pb isotope ratios. The more mafic composition of post 1955 eruptive products can be attributed to increased throughput of mafic magma to the system.

show abstract

“…A Plinian eruption occurred at the Aira caldera 22 ka and Sakurajima started its activity as a post-caldera cone of the caldera 20 ka (Aramaki, 1984). The eruptive history and geology of Mount Sakurajima are summarized systematically by Kobayashi and Ezaki (1996) and Fukuyama (1978), respectively. The following descriptions mainly follow these references.…”

Section: Eruptive Activity Of Mount Sakurajimamentioning

confidence: 99%

Analysis of Topographic Change at Mount Sakurajima, South Kyushu, Japan, using JERS-1 SAR Interferometry

Tomiyama¹,

Koike²,

Iguchi³

et al. 2011

GEOINFORMATICS

View full text Add to dashboard Cite

Monitoring topographic change on a volcano is important for extracting the specific characteristics of its activity and also for investigating local crustal deformation resulting from the regional stress field. Such monitoring can also contribute to reducing vulnerability from volcanic hazards by contributing to eruption forecasts, estimating areas and volumes of pyroclastic deposits, and localizing distributions of volcanic products transported and deposited by rain. Satellite remote sensing has been an effective observation method, and particularly so for active volcanoes with scattered and extensive eruptions. This is because possible surveying equipment sites are limited in terms of both their number and their distribution. Many remote sensing applications using optical and microwave sensors for volcanic analysis have been reported pre

show abstract

Geology of Sakurajima Volcano, southern Kyushu

Cited by 21 publications

References 0 publications

Vegetation Succession on Cut Slopes Covered With Exotic Grasses for Erosion Control, Mt. Sakurajima

Vegetation Succession on Cut Slopes Covered With Exotic Grasses for Erosion Control, Mt. Sakurajima

Using high-resolution Pb isotopes to unravel the petrogenesis of Sakurajima volcano, Japan

Analysis of Topographic Change at Mount Sakurajima, South Kyushu, Japan, using JERS-1 SAR Interferometry

Contact Info

Product

Resources

About