Seismic moment tensor resolution by waveform inversion of a few local noisy records—II. Application to the Phlegraean Fields (Southern Italy) volcanic tremors
Seismic moment tensor resolution by waveform inversion of a few local noisy records—II. Application to the Phlegraean Fields (Southern Italy) volcanic tremors
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一些局部噪声记录的波形反演地震矩张量分辨率——II.在Phlegraean Fields（意大利南部）火山地震中的应用
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Šílený
中科院分区：
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作者：
G. Cespuglio;P. Campus;J. Šílený
在火山和地热地区经常观察到非双力偶（非DC）分量的震源。这表明，非直流分量可能是由高压下的岩浆流体运动和岩脉侵入等现象产生的，这些现象是火山区的特征，被认为是火山震颤的原因。
用波形反演方法处理了意大利南部Phlegraean油田的几次火山地震，这使我们能够估计由于地震图中存在的噪声、震源错位和不适当的结构建模而引起的震源机制和震源时间函数的误差。
所处理的事件是伴随1984年该地区向上缓慢地震和随后1986年向下缓慢地震的地震活动的例子。该机制具有明显的非直流分量，即体积分量和补偿线性矢量偶极（CLVD）分量，反映了岩浆流体的运动。
Seismic sources with non-double-couple (non-DC) components are frequently observed in volcanic and geothermal areas. This suggests that the non-DC components may be generated by phenomena such as movements of magmatic fluids under high pressure and intrusions of dykes, which characterize volcanic areas and are believed to be responsible for volcanic tremors.
Several volcanic tremors from the Phlegraean Fields, Southern Italy, have been processed with the waveform inversion method, which allows us to estimate the error on the source mechanism and on the source time function due to the noise present in the seismograms, the hypocentre mislocation and, in a simplistic way, an improper structure modelling.
The events treated are examples of the seismicity accompanying the upward bradyseism of the area in 1984, and the following downward bradyseism in 1986. Significant non-DC components, i.e. a volumetric part and a compensated linear vector dipole (CLVD), are found in the mechanism, which indicates movement of magmatic fluids in the area.