Surface wave tomography and seismic source studies at Campi Flegrei (Italy)

被引:13
作者
Guidarelli, M
Saraó, A
Panza, GF
机构
[1] Univ Trieste, Dept Earth Sci, I-34127 Trieste, Italy
[2] Abdus Salam Int Ctr Theoret Phys, SAND Grp, Trieste, Italy
关键词
surface wave tomography; velocity models; moment tensor; non-double couple; Campi Flegrei;
D O I
10.1016/S0031-9201(02)00154-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We analyse a set of events, recorded in March 1984 during a period of intense seismicity of the last bradyseismic crisis, to determine shallow velocity models and seismic source moment tensors in the Campi Flegrei region. The velocity models of the crust are obtained by surface wave tomography. Two inland negative anomalies of group velocity resulting in our tomographic maps well agree with previous independent measurements whereas a third anomaly, located in the Pozzuoli Gulf and not evidenced by previous studies, is in correspondence with the caldera position. The inversion of the dispersion curves allows us to extend the already available velocity models within the uppermost 2 km of the crust. The obtained models are employed to study seismic source features by the moment tensor analysis. Preliminary synthetic tests are performed in order to minimise artefacts in the moment tensor solutions possibly due to numerical noise, to station distribution or to the structural modelling approximation. Most of the investigated earthquakes are deviatoric mechanisms and the increase of the isotropic component is observed in connection with the change of the seismicity rate in the investigated temporal window. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:157 / 173
页数:17
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