InSAR observations of the 1995 Fogo, Cape Verde, eruption: Implications for the effects of collapse events upon island volcanoes
InSAR observations of the 1995 Fogo, Cape Verde, eruption: Implications for the effects of collapse events upon island volcanoes
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DOI：
10.1029/2001gl013760
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发表时间：
2002-06-15
影响因子：
5.2
通讯作者：
Day, S
中科院分区：
文献类型：
--
作者：
Amelung, F;Day, S
[1]佛得角群岛的福戈火山在休眠43年后于1995年4月爆发。在7.5周的时间里，从皮科多福戈西南侧的火山口喷发出约46 × 10（6）m（3）的熔岩，进入Cha das Caldeiras。从1993-1998年ERS合成孔径雷达数据获得的干涉图显示，由于馈线岩脉地面变形，但缺乏证据表明，任何火山范围的变形有关的体积变化的浅岩浆库。这表明Fogo来自相对较深的地幔岩石圈源（> 16.5 km深度），与岩石学数据一致。这支持了Cha das Caldeiras是由巨大滑坡造成的塌陷疤痕填充的概念，而不是覆盖在中央浅岩浆房上的塌陷破火山口。巨型滑坡对岩浆系统的干扰可以解释为什么一些具有高岩浆供应率的海洋岛屿火山目前缺乏发育良好的浅层储层。
[1] Fogo volcano, Cape Verde Islands, erupted in April 1995 after 43 years of dormancy. About 46 10(6) m(3) of lava erupted during 7.5 weeks from vents on the SW flank of Pico do Fogo into Cha das Caldeiras. Interferograms obtained from 1993-1998 ERS SAR data show ground deformation due to the feeder dike but lack evidence for any volcano-wide deformation related to volume changes of a shallow magma reservoir. This suggests that Fogo is fed from a relatively deep, mantle-lithospheric source (> 16.5 km depth), consistent with petrological data. This supports the concept that Cha das Caldeiras is the fill of a collapse scar created by a giant landslide, and not a collapse caldera overlying a central, shallow magma chamber. The disturbance of the magmatic system by giant landslides may explain why some oceanic island volcanoes with high magma supply rates currently lack well-developed shallow reservoirs.