Propagation and Attenuation of Lg Waves in South America
Abstract
Lg study is introduced through a revision of investigations made since 1952 (when this phase was described for the first time). This study aims to know characteristics of Lg waves, as recorded in LPB station (WWSSN-type, 16. 5 deg S, 68.1 deg W, 3292 m asl, with a gain of 50,000 or 25,000 time for SP and 1,500 times for LP). Epicenter lists were revised, seismograms inspected to annotate time, amplitude, period and group velocity of Lg phase. Several short- period records were digitized to draw particle motion and Fourier analysis. Earthquakes analysed were classified according to their characteristics into two groups coinciding with path type: a) across shields; b) across cordilleran zones; subdividing seismically active South America into the following origin zones: Brazil, Colombia and Venezuela, Chile, Argentina and Peru.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1988
- Accession Number
- ADA205189
Entities
People
- Estela R. Minaya
- Ramon R. Cabre