Seismic and hydroacoustic observations of the 2016–17 Bogoslof eruption
Seismic and hydroacoustic observations of the 2016–17 Bogoslof eruption
复制标题
2016-17 年博戈斯洛夫火山喷发的地震和水声观测
作者：
G. Tepp;R. Dziak;M. Haney;J. Lyons;C. Searcy;H. Matsumoto;J. Haxel
2016年12月中旬，阿拉斯加州博戈斯洛夫火山开始了长达8.5个月的喷发，造成至少70次爆炸和3个熔岩穹顶。博戈斯洛夫火山是一座紧急的海底火山，只有最顶部才形成一个小岛，因此喷发活动主要发生在海湾或泻湖下面的喷口。博戈斯洛夫喷发是在区域地震和次声阵列上记录的，并由在喷发后半部分在当地部署的水听器记录下来。由于很少有紧急火山喷发有地震声记录，这些观测与卫星和其他观测相结合，为我们提供了一个极大地提高我们对这些喷发产生的地震声信号的了解的机会。这些仪器探测到了一系列活动，包括地震、震动和质量流事件。地震发生在爆炸之前、期间、之后，与爆炸无关，也经常成群发生。地震探测到的47个震群和27个附加的水声探测到的震群可以进一步划分为四种类型：前兆、喷发后、一般和以地震为主。大多数震群的长度不到10小时，地震次数不到50次，平均地震率低于20/小时。对于爆炸，我们计算了震级、频率指数和平均频率。从水听器数据确定的震级与爆炸烟羽高度大致呈线性关系，尽管这种关系在更有限的地震数据中并不明显。最后，根据地震声学特征将喷发活动划分为前兆、开启、爆发I、暂停和爆发II五个阶段。
In mid-December 2016, Bogoslof volcano, Alaska, began an 8.5-month-long eruption that produced at least 70 explosions and three lava domes. Bogoslof is an emergent submarine volcano with only the very top forming a small island, so the eruptive activity mostly occurred from a vent submerged beneath a bay or lagoon. The Bogoslof eruption was recorded on regional seismic and infrasound arrays as well as by a hydrophone that was deployed locally during the second half of the eruption. Since few emergent volcanic eruptions have seismo-acoustic recordings, these observations, taken in context with satellite and other observations, provide an opportunity to greatly improve our understanding of the seismo-acoustic signals produced by these eruptions. The instruments detected a range of activity including earthquakes, tremor, and mass flow events. Earthquakes occurred before, during, after, and unassociated with explosions and also often occurred in swarms. The 47 seismically-detected swarms and 27 additional hydroacoustically detected swarms can be further broken into four types: precursory, post-eruptive, general, and tremor-dominated. Most seismic swarms were less than 10 h long, had fewer than 50 earthquakes, and had average earthquake rates below 20/h. For the explosions, we calculate a tremor magnitude, frequency index, and average frequency. The tremor magnitudes determined from the hydrophone data show a roughly linear relation to explosion plume height, though this relation was not clear in the more limited seismic data. Lastly, we categorize the activity into five eruption phases based on seismo-acoustic character—precursory, opening, explosive I, pause, and explosive II.
博戈斯洛夫火山的共喷震颤：区域距离的地震波场组成
影响因子：
3.5
作者：
Haney, Matthew M.;Fee, David;McKee, Kathleen F.;Lyons, John J.;Matoza, Robin S.;Wech, Aaron G.;Tepp, Gabrielle;Searcy, Cheryl;Mikesell, T. Dylan
通讯作者：
Mikesell, T. Dylan
2016 年至 2017 年阿拉斯加博戈斯洛夫火山喷发期间，充冰是否产生了火山闪电？
影响因子：
3.5
作者：
Van Eaton, Alexa R.;Schneider, David J.;Smith, Cassandra M.;Haney, Matthew M.;Lyons, John J.;Said, Ryan;Fee, David;Holzworth, Robert H.;Mastin, Larry G.
通讯作者：
Mastin, Larry G.