Ambient seismic noise tomography of the Suwannee suture zone using cross-coherence interferometry and double beamforming

被引:0
|
作者
Barman, Debajeet [1 ]
Pulliam, Jay [1 ]
Quiros, Diego A. [1 ,2 ]
机构
[1] Baylor Univ, Dept Geosci, Waco, TX 76798 USA
[2] Univ Cape Town, Dept Geol Sci, ZA-7701 Cape Town, Rondebosch, South Africa
关键词
Seismic interferometry; Seismic noise; Seismic tomography; SOUTHEASTERN UNITED-STATES; RAYLEIGH-WAVE TOMOGRAPHY; PHASE; VELOCITIES; MARGIN;
D O I
10.1093/gji/ggad399
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 use continuous data from more than 200 vertical-component broad-band seismic stations for the years 2012 and 2013 to model the crustal and lithospheric structure of the southeastern United States (SEUS). Seismic interferometry via cross-coherence is used to retrieve the surface wave Empirical Green's function (EGF) between station pairs. We mitigate the problem of non-stationary sources contributing to the extracted EGF by applying double beamforming to pairs of subarrays of stations. The recovered Rayleigh waves are used to compute group velocity dispersion maps which are then inverted to find shear wave velocity profiles using a Markov Chain Monte Carlo technique. EGFs are computed for more than 80 000 station pairs after filtering to the period band 7-60 s. Results reveal tectonic features in the SEUS that support recent claims that the northernmost extent of the Suwannee suture is located near the boundary of the Carolinia and Charleston terranes and that the Charleston and Suwannee terranes are not seismologically distinct within the resolution limits of the data set.
引用
收藏
页码:688 / 699
页数:12
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