Author: VICTOR HUGO ESPINDOLA CASTRO
VICTOR HUGO ESPINDOLA CASTRO (2017)
We present the main characteristics of the crust in the Mexican territory as inferred from analysis of converted teleseismic waves. Teleseismic signals registered at 33 stations of Mexico's National Seismological Service (Servicio Sismologico Nacional) broadband network were collected and processed to obtain receiver functions (RFs). The RFs were analyzed to get optimal depth values of the major litho-logical interfaces and velocity ratios (kappa = V-P/V-S) under the seismic stations. Through stacking of the RFs and comparison with the individual signals, we obtained estimates of the depth of the Moho with average uncertainties of similar to 3.8 km, the depth of a prominent intracrustal interface, and in some cases, the depth of the base of the oceanic crust. The crustal thickness varies from 11 to 42 km and the velocity ratios (V-P/V-S) from 1.60 to 2.10 along the country.
TERREMOTOS DE PROFUNDIDAD INTERMEDIA ZONAS DE SUBDUCCIÓN ACOPLADAS TERREMOTOS INSLAB VARIACIÓN TEMPORAL TRANSFERENCIA DE ESTRÉS SPECTRA CICLO SPECTRA INSLAB EARTHQUAKES TEMPORARY VARIATION INTERMEDIATE DEPTH EARTHQUAKES CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA concept8601 Seismology
VICTOR HUGO ESPINDOLA CASTRO (2018)
Valley of Mexico (VM) Seismic Network-Red Sísmica del Valle de México (RSVM) is a regional digital network deployed by Instituto de Geofísica, Universidad Nacional Autónoma de México (UNAM). It started at 1996 with some vertical shortperiod instruments scattered across the valley, which since 2006 were gradually replaced by three-component intermediate, broadband, and more recently accelerographic instruments. It presently counts 28 stations, representing a contribution to the new generation of regional seismic networks in Mexico with the goal of densifying the coverage throughout the known seismic zones in the country. Along 11 yrs of operation with threecomponent sensors, this network has recorded numerous local and regional earthquakes. Seismicity recorded by RSVM has illuminated major seismic areas inside the valley and the style of faulting of this activity, having for the first time a focal mechanism catalog of this zone of the country. The recent upgrading of 16 out of 31 stations with accelerometers has provided, in real time, the strong ground motion in Mexico City generated by great earthquakes (M > 7) that occurred outside of the valley, having important implications to civil protection purposes. The results obtained up to now highlight the need to complete the upgrade of the rest of the stations, as well as densifying the network to deepen our knowledge of the structure of VM. © Copyright 2018 Seismological Society of America.
REDES DE COMUNICACIÓN SISMOLOGÍA RED SISMICA - VALLE DE MÉXICO SEISMOLOGY Seismic Network CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA Seismology concept8601