An intraslab earthquake at a depth of 100 km in the subducting Cocos plate beneath Nevado de Toluca volcano
Seismicity in the subducted Cocos plate below central Mexico, defined by moderate and large earthquakes, ceases well before reaching the active volcanic front. No intraslab earthquake has been reliably located below Nevado de Toluca and Popocatepetl volcanos. Here we report on an Mw3.3 event at a de...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2020 |
| Country: | México |
| Institution: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repository: | Geofísica Internacional |
| Language: | Spanish |
| OAI Identifier: | oai:revistagi.geofisica.unam.mx:article/115 |
| Online Access: | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/115 |
| Access Level: | Open access |
| Keyword: | sismicidad intraplaca Nevado de Toluca mando astenosférico México |
| Summary: | Seismicity in the subducted Cocos plate below central Mexico, defined by moderate and large earthquakes, ceases well before reaching the active volcanic front. No intraslab earthquake has been reliably located below Nevado de Toluca and Popocatepetl volcanos. Here we report on an Mw3.3 event at a depth of 98 km, 38 km to the west of Nevado de Toluca. The event provides evidence, for the first time from an earthquake, of subducted slab at a depth of ~ 100 km below the volcano. Recordings of the event also provide evidence of high attenuation of shear waves as they propagate through the mantle-wedge asthenosphere. It is possible that intraslab seismicity beneath active volcanoes in central Mexico at M ~3 level is abundant but has not been documented in the past because of poor instrumentation. |
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