Q-values and Attenuation of the Shallow Crust Under Uturuncu Volcano, Bolivia
Document Type
Presentation
Publication Date
12-11-2017
Abstract
Uturuncu Volcano, located in the Altiplano-Puna region of the central Andes, near the border of Bolivia and Chile, has been shown to be inflating at a rate of 1-2 cm/yr over an area that is about 70 km wide. The PLUTONS project deployed 28 broadband seismometers around Uturuncu from April 2009 to October 2012. Several thousand shallow (depth < 20 km) local earthquakes were recorded. Attenuation of seismic waves along travel paths for these local crustal earthquakes can be measured by calculating Q-values, which we have performed using the method of single station spectral ratios by Frankel (1982). Large scatter in the Q-values for various distances and travel times appear to be a function of variations in source depth, focal mechanism, and back azimuth. Preliminary Q-values were calculated for azimuths in 30° increments in sectors around each station. Estimates for Q range from about 60 to 700, with many showing a low Q in the direction of the summit from each station. This suggests that the volcanic pile is more highly attenuating than the surrounding crust.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Presented at the AGU Fall Meeting on December 11, 2017 in New Orleans, LA
Scholar Commons Citation
McFarlin, Heather L.; McNutt, Stephen R.; and Thompson, Glenn, "Q-values and Attenuation of the Shallow Crust Under Uturuncu Volcano, Bolivia" (2017). School of Geosciences Faculty and Staff Publications. 2185.
https://digitalcommons.usf.edu/geo_facpub/2185
