Infrasound from the 2007 fissure eruptions of Kīlauea Volcano, Hawai'i
Infrasound from the 2007 fissure eruptions of Kīlauea Volcano, Hawai'i
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2007 年夏威夷基拉韦厄火山裂缝喷发的次声波
DOI：
10.1029/2010gl046422
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发表时间：
2011
影响因子：
5.2
通讯作者：
M. Poland
中科院分区：
文献类型：
--
作者：
D. Fee;M. Garcés;T. Orr;M. Poland
2007年中期，在k<e:1>劳埃亚火山记录了不同的声波信号，与火山活动的剧烈变化相吻合。在此之前，Pu‘u ’Ō‘ ’ '火山口产生了几乎连续的次声震动，是k<e:1> lauea脱气和熔岩渗出的主要来源。6月中旬蒲峪Ō火山口塌陷排水产生脉冲次声信号和次声震动波动。利用次声阵列对6月19日和7月21日的裂缝喷发进行了空间和时间定位。6月19日，k<e:1> lauea峰顶和Pu‘u ’Ō‘ ’之间的裂缝爆发，产生了大约30分钟的次声，这是观测到的与裂缝开放有关的唯一地球物理信号。7月21日喷发的次声信号就在Pu‘u ’Ō‘ ’ ‘ ’东面，显示出一个清晰的方位角随时间的变化，表明裂缝在12.9小时内扩展。总裂缝扩展速度相对较慢，为164 m/hr，但裂缝系统是不连续破裂的。单个裂缝的破裂时间是利用声学数据和目视观测相结合来估计的。
Varied acoustic signals were recorded at Kīlauea Volcano in mid‐2007, coincident with dramatic changes in the volcano's activity. Prior to this time period, Pu'u 'Ō'ō crater produced near‐continuous infrasonic tremor and was the primary source of degassing and lava effusion at Kīlauea. Collapse and draining of Pu'u 'Ō'ō crater in mid‐June produced impulsive infrasonic signals and fluctuations in infrasonic tremor. Fissure eruptions on 19 June and 21 July were clearly located spatially and temporally using infrasound arrays. The 19 June eruption from a fissure approximately mid‐way between Kīlauea's summit and Pu'u 'Ō'ō produced infrasound for ∼30 minutes—the only observed geophysical signal associated with the fissure opening. The infrasound signal from the 21 July eruption just east of Pu'u 'Ō'ō shows a clear azimuthal progression over time, indicative of fissure propagation over 12.9 hours. The total fissure propagation rate is relatively slow at 164 m/hr, although the fissure system ruptured discontinuously. Individual fissure rupture times are estimated using the acoustic data combined with visual observations.