Development of a 3-D upper crustal velocity model for the Goldstream Valley, central Alaska

• Main Author: Dougherty, Sara L.
• Format: Others
• Language: English
• Published: Boston College 2008
• Subjects: velocity model; surface waves; body waves; refraction; anisotropy; time-term
• Online Access: http://hdl.handle.net/2345/352

The uppermost crustal velocity structure of the Goldstream Valley, central Alaska is investigated using a series of five explosions that were detonated in schist bedrock and recorded at >120 local stations to develop 1-D and 3-D models of the upper crust. Simple refraction analyses reveal that both P- and S-wave arrival times are azimuth dependent, with the fastest velocities in the southeast and northeast directions. The Swave velocity structure of the upper crust is also determined through multiple filter analysis and a damped, least squares inversion of 0.2-2 sec period Rg waves. The shear wave velocity model from the surface-wave analysis is combined with the refraction analysis results to develop 1-D P- and S-wave models to a depth of 2 km. In order to better constrain P- and S-wave velocity variations both laterally and with depth throughout the Goldstream Valley, 3-D velocity models are produced using a numerical simulation model. === Thesis (MS) — Boston College, 2008. === Submitted to: Boston College. Graduate School of Arts and Sciences. === Discipline: Geology and Geophysics.