Shallow velocity model in the area of Pozzo Pitarrone, Mt. Etna, from single station, array methods and borehole data
Shallow velocity model in the area of Pozzo Pitarrone, Mt. Etna, from single station, array methods and borehole data
复制标题
埃特纳火山 Pozzo Pitarrone 地区的浅层速度模型，来自单站、阵列方法和钻孔数据
DOI：
10.4401/ag-7086
复制
发表时间：
2016
影响因子：
1
通讯作者：
S. Rapisarda
中科院分区：
文献类型：
--
作者：
L. Zuccarello;M. Paratore;M. Rocca;F. Ferrari;A. Messina;S. Branca;D. Contrafatto;D. Galluzzo;S. Rapisarda
安装在埃特纳火山东北侧翼Pozzo Pitarrone附近的临时阵列记录的地震噪声已经用几种技术进行了分析。采用单站HVSR法和空间阵法对静态地震噪声进行了局部浅层结构研究。对频散曲线的反演得到了该地区130 m以下的切变波速模型。该模型与研究区已有的地层资料进行了比较，得到了较好的定性吻合。利用安装在130米深的钻孔站，我们还可以通过比较当地地震的钻孔记录与地面记录的相同事件来估计纵波速度。对130 m层上部纵波速度的进一步了解来自钻孔站观测到的某些情况下的表面反射波。从这个分析中，我们得到了平均纵波速度约为1.2 km/s，与从地震噪声分析中得到的横波速度一致。
Seismic noise recorded by a temporary array installed around Pozzo Pitarrone, NE flank of Mt. Etna, have been analysed with several techniques. Single station HVSR method and SPAC array method have been applied to stationary seismic noise to investigate the local shallow structure. The inversion of dispersion curves produced a shear wave velocity model of the area reliable down to depth of about 130 m. A comparison of such model with the stratigraphic information available for the investigated area shows a good qualitative agreement. Taking advantage of a borehole station installed at 130 m depth, we could estimate also the P-wave velocity by comparing the borehole recordings of local earthquakes with the same event recorded at surface. Further insight on the P-wave velocity in the upper 130 m layer comes from the surface reflected wave observable in some cases at the borehole station. From this analysis we obtained an average P-wave velocity of about 1.2 km/s, compatible with the shear wave velocity found from the analysis of seismic noise.