ABSTRACT Monowai is an active submarine volcanic centre in the Kermadec Arc, Southwest Pacific Ocean. Multi-beam data acquired during expedition SO225 aboard R/V SONNE in December 2012 indicates that the topography of the main stratocone has evolved significantly since the last survey in June 2011. Bathymetric measurements of the edifice reveal differences of up to 42 m in seafloor depth and indicate a net volume increase of ∼0.037 km3 across the summit area. Explosive volcanism observed onsite during the SO225 mapping campaign could be linked to a 20h-long swarm of unusually coherent T phase arrivals, suggesting that Monowai is a prime source of broadband seismic noise in the Southwest Pacific region during times of activity. Our findings further document the dynamic nature of volcanic processes at Monowai and have implications for future expedition planning.

中文翻译：

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更新了 Kermadec Arc 北部 Monowai 的海底地形和 T 相地震活动

摘要 Monowai 是位于西南太平洋克马德克弧的一个活跃的海底火山中心。2012 年 12 月在 R/V SONNE 上的 SO225 探险期间获得的多波束数据表明，自 2011 年 6 月的上次勘测以来，主平层锥体的地形发生了显着变化。对建筑物的水深测量显示海底深度差异高达 42 m并表明整个峰顶区域的净体积增加了约 0.037 平方公里。在 SO225 测绘活动期间现场观察到的爆炸性火山活动可能与长达 20 小时的异常连贯 T 相到达群有关，这表明莫诺威是活动期间西南太平洋地区宽带地震噪声的主要来源。