oa Propagation Efficiency of Long-Period Lg Waves in the Brazilian Shield and the Andes

We investigate the propagation efficiency characteristics of long-period (3-12s) Lg waves in continental South America as recorded in the last few years on stations of the GTSN, IRIS/uSGS, IRISIIDA and GEOSCOPE networks. This note reports results of a first look at the available Lg data for events with Ms>5.0 from 1990 to 1995.