We determine frequency-dependent attenuation 1/Q(f) for the Hispaniola region using direct S and Lg waves over five distinct passbands from 0.5 to 16 Hz. Data consist of 832 high-quality vertical and horizontal component waveforms recorded on short-period and broadband seismometers from the devastating 12 January 2010 M 7.0 Haiti earthquake and the rich sequence of aftershocks. For the distance range 250–700 km, we estimate an average frequency-dependent Q(f)=224(±27)f0.64(±0.073) using horizontal components of motion and note that Q(f) estimated with Lg at regional distances is very consistent across vertical and horizontal components. We also determine a Q(f)=142(±21)f0.71(±0.11) for direct S waves at local distances, ≤100 km. The strong attenuation observed on both vertical and horizontal components of motion is consistent with expectations for a tectonically active region.
|Title||Frequency-dependent attenuation of the Hispaniola Island region of the Caribbean Sea|
|Authors||D. McNamara, M. Meremonte, J.Z. Maharrey, S-L. Mildor, J.R. Altidore, D. Anglade, S. E. Hough, D. Given, H. Benz, L. Gee, A. Frankel|
|Publication Subtype||Journal Article|
|Series Title||Bulletin of the Seismological Society of America|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Geologic Hazards Science Center|