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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magnetic field changes on White Island, New Zealand, and the value of magnetic changes for eruption forecasting
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Magnetic field changes on White Island, New Zealand, and the value of magnetic changes for eruption forecasting

机译：新西兰怀特岛的磁场变化以及对火山爆发预报的磁场变化值

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摘要

For about 15 years after their commencement in 1968, magnetic measurements in the crater of White Island gave a good indication of the state of activity and the likelihood of an eruption episode commencing. During this period, magnetic, thermal, ground level and chemical measurements were all generally consistent with a model in which these suriace changes were caused by increasing temperatures under the Donald Mound area, in the central sub-crater. In more recent times, there has not been such a relationship between the changes around the remnants of Donald Mound and the volcanic activity, which has become localised in the west sub-crater. It appears that changes under the crater, especially lowering of the ground surface and the water table at the west end of the crater, have meant that eruptions are no longer preceded by heating under Donald Mound. The west sub-crater is not easily accessible for repeat surface surveys. One way in which we might be able to monitor future volcanic activity at White Island would be by repeated aeromagnetic surveys, as the magnetic changes are so large that changes of hundreds of nanoTeslas are likely to be observed at practical flying heights.
机译：自1968年开始使用以来，在大约15年的时间里，怀特岛火山口的磁测量结果很好地指示了活动状态以及爆发爆发的可能性。在此期间，磁，热，地平面和化学测量都与一个模型一致，在该模型中，这些陨石的变化是由中央次火山口中唐纳德蒙德地区温度升高引起的。最近，唐纳德·蒙德（Donald Mound）残余物周围的变化与火山活动之间没有这种关系，而火山活动已经局限于西部的次火山口。火山口下的变化，特别是火山口西端地面和地下水位的降低，似乎意味着在唐纳德·蒙德（Donald Mound）统治下爆发之前不再需要加热。对于重复的地面勘测，不容易找到西子陨石坑。我们可以通过重复的航空磁测来监视白岛未来的火山活动，其中一种方法是重复进行航空磁测，因为磁的变化很大，以至于在实际飞行高度上可能会观察到数百个纳米特斯拉的变化。

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