| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
|
|
タイトル |
Fragility and an extremely low shear modulus of high porosity silicic magma |
|
言語 |
en |
| 作成者 |
Namiki, Atsuko
Tanaka, Yukie
Okumura, Satoshi
Sasaki, Osamu
Sano, Kyohei
Takeuchi, Shingo
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
権利情報 |
© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| 権利情報 |
|
|
権利情報 |
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。 |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Magma |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Fracture |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Rheology |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Bubble |
| 内容記述 |
|
|
内容記述 |
The rheology and strength of bubbly magma govern eruption dynamics by determining the possibility of fragmentation of ascending magmas. They are also required parameters for understanding seismic monitoring. We measured the rheology and strength of high porosity rhyolitic magma at 500–950 °C. The measured shear modulus and strength are several orders of magnitude lower than bubble-free rhyolite melt, implying that high porosity magma cannot avoid fracturing during magma ascent. The occurrence of fractures is observed in the low-temperature magma (≤800 °C). In this temperature range, the measured attenuation is low. That is, the elastic energy originated by deformations avoids attenuation and is stored in the bubbly magma until released by fracturing (Q > 1). The newly found porosity-dependent strength based on our measurements comprehensively explains three different fragmentation criteria that have been previously proposed independently. Our measurements also show that the shear modulus becomes lower by increasing porosity, which can slow the shear wave velocity. These results suggest that knowing the attenuation of the seismic wave is useful to evaluate magma temperature and the possibility of a fragmentation event that may determine subsequent volcanic activities. |
|
言語 |
en |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
This work is supported by JSPS KAKENHI grants 16H04042 and 19H00721. |
| 出版者 |
|
|
出版者 |
Elsevier |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
AO |
|
出版タイプResource |
http://purl.org/coar/version/c_b1a7d7d4d402bcce |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1016/j.jvolgeores.2019.106760 |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1016/j.jvolgeores.2019.106760 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0377-0273 |
| 開始ページ |
|
|
開始ページ |
106760 |
| 書誌情報 |
Journal of Volcanology and Geothermal Research
Journal of Volcanology and Geothermal Research
巻 392,
p. 106760,
発行日 2020-02-15
|
| 旧ID |
51064 |
| 備考 |
The full-text file will be made open to the public on 15 Feb 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving' |
JVGR_392_106760.pdf (2.9 MB)
