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Magma plumbing system and seismicity of an active mid-ocean ridge volcano

机译:活跃中洋脊火山岩浆管道系统和地震活动性

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摘要

At mid-ocean ridges volcanism generally decreases with spreading rate but surprisingly massive volcanic centres occur at the slowest spreading ridges. These volcanoes can host unexpectedly strong earthquakes and vigorous, explosive submarine eruptions. Our understanding of the geodynamic processes forming these volcanic centres is still incomplete due to a lack of geophysical data and the difficulty to capture their rare phases of magmatic activity. We present a local earthquake tomographic image of the magma plumbing system beneath the Segment 8 volcano at the ultraslow-spreading Southwest Indian Ridge. The tomography shows a confined domain of partial melt under the volcano. We infer that from there melt is horizontally transported to a neighbouring ridge segment at 35 km distance where microearthquake swarms and intrusion tremor occur that suggest ongoing magmatic activity. Teleseismic earthquakes around the Segment 8 volcano, prior to our study, indicate that the current magmatic spreading episode may already have lasted over a decade and hence its temporal extent greatly exceeds the frequent short-lived spreading episodes at faster opening mid-ocean ridges.
机译:在大洋中部山脊上,火山活动通常随着扩散速度而降低,但是令人惊讶的是,在最慢的山脊上出现了大规模的火山中心。这些火山可能会发生意想不到的强烈地震以及剧烈的爆炸性海底喷发。由于缺乏地球物理数据以及难以捕获其罕见的岩浆活动相,我们对形成这些火山中心的地球动力学过程的理解仍然不完整。我们展示了西南印度洋超慢速蔓延的第8段火山下方岩浆管道系统的局部地震层析图像。断层扫描显示火山下方部分熔体的局限区域。我们推断,从那里融化的水被水平地输送到35 km距离的相邻山脊段,在那里发生微地震群和侵入性震颤,表明正在进行的岩浆活动。在我们进行研究之前,第8段火山周围的远程地震表明,目前的岩浆扩散事件可能已经持续了十多年,因此其时间范围大大超过了在较快开放的中洋海脊频繁发生的短寿命扩散事件。

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