Distribution of (mb - Ms) of moderate earthquakes along the Mexican seismic zone
We study the spatial distribution of mb-Ms for 55 earthquakes from 1978 to 1994 with focal depth from 0 to 80 km, mb from 4.5 to 5.5, which occurred along the Middle America trench, between 95° to 107° W. The mb-Ms values have a bimodal distribution, with peaks at values of 0.3 and 0.8 and minimum a...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1999 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Geofísica Internacional |
| Idioma: | español |
| OAI Identifier: | oai:revistagi.geofisica.unam.mx:article/629 |
| Acceso en línea: | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/629 |
| Access Level: | acceso abierto |
| Palabra clave: | Temblor magnitud México subducción Earthquake magnitude Mexico subduction |
| Sumario: | We study the spatial distribution of mb-Ms for 55 earthquakes from 1978 to 1994 with focal depth from 0 to 80 km, mb from 4.5 to 5.5, which occurred along the Middle America trench, between 95° to 107° W. The mb-Ms values have a bimodal distribution, with peaks at values of 0.3 and 0.8 and minimum at mb-Ms=0.6. Events of the first group, mb-Ms <0.6, were distributed along the trench over the whole region, and events of the second group, mb-Ms ³ 0.6, were found mainly in the central part of the region, within the Guerrero block. These data show that the Oaxaca block consists of a relatively homogeneous lithosphere, where low- frequency events dominate, while the Guerrero block is more complex radiating both low- and high-frequency events. |
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