Spectra of some Oaxaca earthquake aftershocks from RESMAC

S-wave spectra of the main event and 21 aftershocks of the Oaxaca (November 29, 1978) earthquake, registered digitally on a RESMAC fixed seismic telemetry station 500 km from the epicentral area, have been calculated. Due to the bandwidth of the RESMAC system, the corner frequency of the shear wave...

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Detalles Bibliográficos
Autores: Rebollar, C. J., Nyland, E.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1980
País:México
Institución:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositorio:Geofísica Internacional
Idioma:español
OAI Identifier:oai:revistagi.geofisica.unam.mx:article/23
Acceso en línea:http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/23
Access Level:acceso abierto
Palabra clave:ondas S
sismo
Oaxaca
sistema RESMAC
sismograma
RESMAC system
earthquake
S waves
seismograms
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spelling Spectra of some Oaxaca earthquake aftershocks from RESMACSpectra of some Oaxaca earthquake aftershocks from RESMACRebollar, C. J.Nyland, E.ondas SsismoOaxacasistema RESMACsismogramaOaxacaRESMAC systemearthquakeS wavesseismogramsS-wave spectra of the main event and 21 aftershocks of the Oaxaca (November 29, 1978) earthquake, registered digitally on a RESMAC fixed seismic telemetry station 500 km from the epicentral area, have been calculated. Due to the bandwidth of the RESMAC system, the corner frequency of the shear wave spectrum of the main event is not observed. We do see two slopes at high frequencies (-2.0 and -2.8) intersecting at a frequency of 1.4 HZ. Comparison of the spectra of aftershocks with those obtained from the nearby portable digital stations shows a shift of comer frequency to the lower frequencies, typically of the order of 0.3 HZ and in general, a smaller value, typically 4.3 smaller, for the seismic moment. The corner frequencies of the P-wave spectra are outside the observed frequency band.Fue calculado el espectro de las ondas S del evento principal y 21 réplicas del sismo de Oaxaca (Noviembre 29, 1978) registrados digitalmente a 500 Km del área epicentral en las estaciones sísmicas fijas telemétricas de RESMAC. Debido al ancho de banda en frecuencias del sistema RESMAC, el espectro de las ondas S del evento principal no muestra ninguna frecuencia de esquina. Este muestra dos pendientes a frecuencias altas (-2.0 y -2.8) intersectándose a una frecuencia de 1.4 HZ. La comparación de los espectros de las réplicas con aquellos obtenidos con las estaciones portátiles digitales cercanas, muestran un cambio de la frecuencia de esquina a bajas frecuencias típicamente del orden de 0.3 HZ y, en general, un valor pequeño, típicamente 4.3 menor, para el momento sísmico. EI espectro de la onda P no muestra ninguna frecuencia de esquina en los sismogramas de RESMAC.Universidad Nacional Autónoma de México. Instituto de Geofísica1980-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/2310.22201/igeof.00167169p.1980.19.2.881Geofisica Internacional; Vol. 19 No. 2 (1980): April 1, 1980; 109-127Geofísica Internacional; Vol. 19 Núm. 2 (1980): Abril 1, 1980; 109-1272954-436X0016-716910.22201/igeof.00167169p.1980.19.2reponame:Geofísica Internacionalinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMspahttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/23/1489Derechos de autor 1980 Geofisica Internacionalhttps://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:revistagi.geofisica.unam.mx:article/232024-08-16T17:31:46Z
dc.title.none.fl_str_mv Spectra of some Oaxaca earthquake aftershocks from RESMAC
Spectra of some Oaxaca earthquake aftershocks from RESMAC
title Spectra of some Oaxaca earthquake aftershocks from RESMAC
spellingShingle Spectra of some Oaxaca earthquake aftershocks from RESMAC
Rebollar, C. J.
ondas S
sismo
Oaxaca
sistema RESMAC
sismograma
Oaxaca
RESMAC system
earthquake
S waves
seismograms
title_short Spectra of some Oaxaca earthquake aftershocks from RESMAC
title_full Spectra of some Oaxaca earthquake aftershocks from RESMAC
title_fullStr Spectra of some Oaxaca earthquake aftershocks from RESMAC
title_full_unstemmed Spectra of some Oaxaca earthquake aftershocks from RESMAC
title_sort Spectra of some Oaxaca earthquake aftershocks from RESMAC
dc.creator.none.fl_str_mv Rebollar, C. J.
Nyland, E.
author Rebollar, C. J.
author_facet Rebollar, C. J.
Nyland, E.
author_role author
author2 Nyland, E.
author2_role author
dc.subject.none.fl_str_mv ondas S
sismo
Oaxaca
sistema RESMAC
sismograma
Oaxaca
RESMAC system
earthquake
S waves
seismograms
topic ondas S
sismo
Oaxaca
sistema RESMAC
sismograma
Oaxaca
RESMAC system
earthquake
S waves
seismograms
description S-wave spectra of the main event and 21 aftershocks of the Oaxaca (November 29, 1978) earthquake, registered digitally on a RESMAC fixed seismic telemetry station 500 km from the epicentral area, have been calculated. Due to the bandwidth of the RESMAC system, the corner frequency of the shear wave spectrum of the main event is not observed. We do see two slopes at high frequencies (-2.0 and -2.8) intersecting at a frequency of 1.4 HZ. Comparison of the spectra of aftershocks with those obtained from the nearby portable digital stations shows a shift of comer frequency to the lower frequencies, typically of the order of 0.3 HZ and in general, a smaller value, typically 4.3 smaller, for the seismic moment. The corner frequencies of the P-wave spectra are outside the observed frequency band.
publishDate 1980
dc.date.none.fl_str_mv 1980-04-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/23
10.22201/igeof.00167169p.1980.19.2.881
url http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/23
identifier_str_mv 10.22201/igeof.00167169p.1980.19.2.881
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/23/1489
dc.rights.none.fl_str_mv Derechos de autor 1980 Geofisica Internacional
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Derechos de autor 1980 Geofisica Internacional
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
dc.source.none.fl_str_mv Geofisica Internacional; Vol. 19 No. 2 (1980): April 1, 1980; 109-127
Geofísica Internacional; Vol. 19 Núm. 2 (1980): Abril 1, 1980; 109-127
2954-436X
0016-7169
10.22201/igeof.00167169p.1980.19.2
reponame:Geofísica Internacional
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Geofísica Internacional
collection Geofísica Internacional
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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