レポート

Tongariro Volcano

公開日 : 2012年08月07日
最終更新 :

ニュースで噴火したことだけわかりましたが、規模の詳細と今後の見込みは判りません。
http://www.stuff.co.nz/national/7426862/First-Tongariro-eruption-in-over-100-years

ここには噴火の具体的記述が無さそう。
http://www.geonet.org.nz/volcano/activity/tongariro/

ここの情報は早くない。
http://www.volcano.si.edu/reports/usgs/index.cfm?content=worldmap

火山国ですから、かなり噴火慣れしている面もあるのかしら。

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  • これは火砕流でしょうか

    無学なので何なのか判りませんが、画像を見て火砕流かと連想しました。
    http://www.flickr.com/photos/geonet_nz/

    上記へのリンク元。
    http://www.geonet.org.nz/volcano/alert-bulletins/archives/2012/aug-8-2012-3-00-pm-tongariro-volcano.html

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  • Ash は、火山灰ですね

    単なる灰のじゃないのは判りますが、これが酸性が強かったりすると畜産動物や植物がやられることもあるのでしょうね。
    Ashfall:火山灰の飛散は Napier の近くまで届いたみたいです。

    GeoNet で詳しく書かれているのをみつけました。
    http://www.geonet.org.nz/volcano/alert-bulletins/archives/2012/aug-7-2012-12-15-pm-tongariro-volcano.html

    A short lived phreatic eruption occurred at the Te Māri craters area on Mount Tongariro at approximately 11:50 pm last night (Monday, August 6). Activity at the present time consists of steam clouds and some small earthquakes. Eruptive activity is low level but could recommence at any time.

    Observations of Mount Tongariro this morning by GNS Science are that eruption activity has subsided. White steam clouds were observed at the historically active Te Māri craters area but poor weather conditions at the time obscured a direct view of the active vent(s). There have been no lahars or pyroclastic flows or lava flows.

    Our analysis of seismic data is that there was an explosive eruption lasting only a minute or two, followed by a series of discrete small earthquakes over the next few tens of minutes. No volcanic tremor occurred in the days preceding the eruption, nor has any occurred since then.

    It is too early to predict the next series of events, but we expect heightened activity may continue for several weeks. There are likely to be specific signals of future magma movement beneath the volcano and we continue to monitor the situation through the GeoNet volcano-seismic network of instruments.

    As with any volcano, an eruption could occur at Tongariro at any time with little or no warning and there is an elevated level of risk, particularly on the northern slopes and valleys of the mountain.

    Ash samples collected near Lake Rotoaira last night will be tested and analysis of seismic data continues. GNS Science volcanologists are continuing to monitor the eruption and are working with Massey and Canterbury universities collect samples for analysis, as conditions permit. Further information will be released as soon as it is available.


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