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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Recent eruptions at Bezymianny volcano-A seismological comparison
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Recent eruptions at Bezymianny volcano-A seismological comparison

机译：贝济米尼火山最近的喷发-地震学比较

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For the past few decades, Bezymianny volcano has erupted once to twice per year. Here, I examine eight eruptive events between 2006 and 2010. This is the first time period for which proximal or broadband seismic data have been recorded at Bezymianny. Several recurring patterns are demonstrated in advance of eruptions. Eruptions are generally preceded by 12-36 h of tremor energy elevated by 2 to 3 orders of magnitude. Locatable earthquake activity is quite erratic in the days before eruptions. For eruptions of juvenile magma, however, the cumulative moment magnitude increases with the repose time since the previous eruption. Though tenuous, this relationship is statistically significant and could improve forecasts of Bezymianny eruptions. The most energetic eruptions demonstrate increasing multiplet activity in the run-up, followed by a rapid cessation at the time of eruption. When present, this behavior marks increasing pressure in the conduit system as degassing eclipses the capacity for venting. Very long period seismicity (>20 s periods) accompanies some eruptions. These tend to be the same short-lived high-energy eruptions that exhibit multiplet precursors. Four eruptions are examined in detail to illustrate the variety in eruption mechanisms. Lava dome collapses, sustained eruptions, singular paroxysmal explosions and post-explosion lava flows occur in different combinations demonstrating that more than one eruption trigger is regulating Bezymianny. Compared to Bezymianny's fifty-year modern history, recent eruptions have been shorter-lived and separated by longer repose times. Some evidence suggests that these eruptions may be increasingly explosive-a speculation that carries significant hazard implications. If true, however, this threat is tempered by solid evidence that the most explosive eruptions are preceded by the clearest precursors, suggesting an ability to improve the already excellent eruption forecasts available for Bezymianny.
机译：在过去的几十年中，Bezymianny火山每年爆发一次至两次。在这里，我研究了2006年至2010年之间的八次爆发事件。这是Bezymianny首次记录近端或宽带地震数据。喷发前已证明了几种复发模式。通常在爆发之前，震颤能量会在12-36小时内升高2到3个数量级。爆发前几天，可定位的地震活动非常不稳定。但是，对于幼岩浆喷发，自上一次喷发以来，累积矩量随休止时间而增加。这种关系虽然微弱，但在统计上却很重要，可以改善对Bezymianny爆发的预测。最活跃的爆发表明，在爆发前多重活动不断增加，随后在爆发时迅速停止。如果存在这种现象，则表明管道系统中的压力增加，因为脱气使排气能力黯然失色。长时间的地震活动（> 20 s周期）伴随着一些喷发。这些往往是表现出多重前体的短暂高能喷发。详细检查了四个喷发，以说明喷发机制的多样性。熔岩穹顶坍塌，持续喷发，奇异的阵发性爆炸和爆炸后的熔岩流以不同的组合发生，这表明有多个喷发触发因素正在调节Bezymianny。与贝西米安（Bezymianny）的五十年现代历史相比，最近的火山爆发寿命较短，而休养时间更长。一些证据表明，这些喷发可能越来越具有爆炸性，这种推测带有重大危害隐患。但是，如果确实如此，那么这种威胁将被有力的证据所抑制，这些证据表明，最具爆炸性的爆发始于最清晰的前兆，这暗示着有能力改善对Bezymianny的喷发预报。

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