1.
In. México. Universidad Nacional Autónoma de México (UNAM); México. Secretaria de Gobernación; México. Centro Nacional de Prevención de Desastres (CENAPRED). Volcan Popocatepetl estudios realizados durante la crisis de 1994-1995. México, D.F, México. Comite Científico Asesor CENAPRED - UNAM, jul. 1995. p.139-66, mapas, tab.
Monography
in Es
| Desastres -Disasters-
| ID: des-8619
ABSTRACT
Between December 1st, 1994, and January 30, 1995, 5 digital, Three-component seismographs were installed to record seismic activity associated with Popocatépetl volcano. We describe the records obtained at PPC before, simultaneous with, and after the crisis of December 21, 1994. Site effect amplification at PPC occurs at frequencies larger tham 15 Hz. Therefore, differences in wavw shape and dominant frequencies between Type A and Type-B events may be due to source or path effects. We analyzed the spectra of volcanic tremors and Type-B events before the crisis (AU)
