Highlights from a seismic broadband array on Stromboli Volcano
Highlights from a seismic broadband array on Stromboli Volcano
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斯特龙博利火山地震宽带阵列的亮点
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
T. Braun
中科院分区：
文献类型：
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作者：
Juegen Neuberg;R. Luckett;M. Ripepe;T. Braun
在斯特龙博利火山上以两种不同的配置部署了一个由九个三分量宽带地震仪组成的阵列。对与火山爆发有关的地震波场的分析揭示了一些观察结果，这些观察结果为火山的内部动力学提供了全新的见解。这些新的观测结果仅限于1 Hz以下的低频范围，因此强调了宽带记录相对于传统短期观测的优越性。令人惊讶的是，简单的小波表示最初的收缩源机制。在短周期地震记录中根本看不到的气体喷流，在宽频带记录中产生了清晰的反射子波，表明了相同的收缩震源机制。质点运动分析和地震阵列技术可以确定地震源的位置。我们发现3s和6s周期的低频信号与喷发无关，与喷发相关事件不共享共同的源。在火山口地区可见的火山活动的视频记录允许人们精确地将喷发特征与地震信号相关联。
An array of nine three-component broadband seismometers was deployed in two different configurations on Stromboli volcano. The analysis of the seismic wavefield related to volcanic explosions revealed some observations which offer a completely new insight into the internal dynamics of a volcano. These new observations are restricted to the low-frequency range below 1 Hz and underline, therefore, the superiority of broadband recordings over conventional short-period observations. Surprisingly simple wavelets indicate an initially contracting source mechanism. Gas-jets, that could not be seen in a short-period seismic record at all, generate a clear dilatational wavelet in a broadband recording suggesting the same contracting source mechanism. The analysis of particle motion and seismic array techniques permits a location of the seismic source. We find low-frequency signals of 3s and 6s period that are not related to eruptions and do not share a common source with the eruption-related events. A video recording of visible volcanic activity at the crater region allows one to correlate precisely eruptive features with seismic signals.