Ambient noise tomography across Mount St. Helens using a dense seismic array

2017 ◽  
Vol 122 (6) ◽  
pp. 4492-4508 ◽  
Author(s):  
Yadong Wang ◽  
Fan-Chi Lin ◽  
Brandon Schmandt ◽  
Jamie Farrell
Keyword(s):  
Ambient Noise ◽  
Seismic Array ◽  
Ambient Noise Tomography ◽  
Dense Seismic Array ◽  
Mount St Helens

A pilot project of ambient noise tomography on a dense seismic array in Ji’nan urban area

2018 ◽  
Vol 31 (5-6) ◽  
pp. 262-271
Author(s):  
Feng Liang ◽  
◽  
Lei Gao ◽  
Zhihui Wang ◽  
Tao Wang ◽  
...  
Keyword(s):  
Urban Area ◽  
Ambient Noise ◽  
Pilot Project ◽  
Seismic Array ◽  
Ambient Noise Tomography ◽  
Dense Seismic Array

scholarly journals High-resolution 3D shallow crustal structure in Long Beach, California: Application of ambient noise tomography on a dense seismic array

Geophysics ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. Q45-Q56 ◽  
Author(s):  
Fan-Chi Lin ◽  
Dunzhu Li ◽  
Robert W. Clayton ◽  
Dan Hollis
Keyword(s):  
Phase Velocity ◽  
Ambient Noise ◽  
Velocity Structure ◽  
Shear Velocity ◽  
Seismic Array ◽  
Clear Correlation ◽  
Long Beach ◽  
Ambient Noise Tomography ◽  
Station Pair ◽  
Dense Seismic Array

Ambient noise tomography has proven to be effective in resolving shallow earth structure. We applied ambient noise tomography on a dense seismic array in Long Beach, California. The array was composed of more than 5200 stations with an average spacing close to 100 m. Three weeks of passive ambient noise were crosscorrelated between each station pair, which resulted in more than 13.5 million crosscorrelations within the area. Clear fundamental-mode Rayleigh waves were observed between 0.5 and 4 Hz, which were most sensitive to structure above 1-km depth. For each station pair, we applied frequency-time analysis to determine the phase traveltime dispersion, and, for each frequency, we applied eikonal tomography to determine the Rayleigh wave phase velocity map. The eikonal tomography accounted for ray bending by tracking the wavefront and allowed uncertainties to be estimated through statistical analysis. The compilation of phase velocity maps was then used to invert for 3D shear velocity structure. The inverted model showed clear correlation with the known geologic features such as the shallow south–north velocity dichotomy and a deeper fast anomaly associated with the Newport-Inglewood fault zone. Our results can potentially be used to complement traditional active source studies.

scholarly journals Imaging Karatungk Cu-Ni Mine in Xinjiang, Western China with a Passive Seismic Array

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 601 ◽  
Author(s):  
Peixiao Du ◽  
Jing Wu ◽  
Yang Li ◽  
Jian Wang ◽  
Chunming Han ◽  
...  
Keyword(s):  
High Velocity ◽  
Ambient Noise ◽  
Joint Inversion ◽  
Wave Structure ◽  
Seismic Array ◽  
Western China ◽  
Ambient Noise Tomography ◽  
Magma Intrusion ◽  
Low Velocity ◽  
Velocity Zone

Karatungk Mine is the second-largest Cu-Ni sulfide mine in China. However, the detailed structure beneath the mine remains unclear. Using continuous waveforms recorded by a dense temporary seismic array, here we apply ambient noise tomography to study the shallow crustal structure of Karatungk Mine down to ~1.3 km depth. We obtain surface-wave dispersions at 0.1–1.5 s by calculating cross-correlation functions, which are inverted for 3D shear-wave structure at the top-most (0–1.3 km) crust by a joint inversion of group and phase dispersions. Our results show that low-velocity zones beneath Y1 ore-hosting intrusion (hereafter called Y1) at 0–0.5 km depth and northwest of the Y2 ore-hosting intrusion (hereafter called Y2) at 0–0.6 km depth are consistent with highly mineralized areas. A relatively high-velocity zone is connected with a weakly mineralized area located to the southeast of Y2 and Y3 (hereafter called Y3) ore-hosting intrusions. Two high-velocity zones, distributed at 0.7–1.3 km depth in the northernmost and southernmost parts of the study area respectively, are interpreted to be igneous rocks related to early magma intrusion. Furthermore, the low-velocity zone at 0.7–1.3 km depth in the middle of the study area may be related to: a possible channel related to initial magma transport; mine strata or a potentially mineralized area. This study demonstrates a new application of dense-array ambient noise tomography to a mining area that may guide future studies of mineralized regions.

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