The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications
We invert GPS position data to map fhe slip on the plate interface during an aseismic, slow~slip event, which occurred in 2002 in the Guerrero seismic gap of the M~xican subduction zone, lasted for -4 months, and was detected by 7 continuous GPS receivers located over an area of -550x250 km2. Our be...
| Authors: | ; ; ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2004 |
| Country: | México |
| Institution: | UNAM |
| Repository: | Geofísica Internacional |
| Language: | Spanish English |
| OAI Identifier: | oai:revistagi.geofisica.unam.mx:article/953 |
| Online Access: | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/953 |
| Access Level: | Open access |
| Keyword: | Sismo lento Brecha sisimica de Guerrero GPS Slow earthquake Guerrero seismic gap |
| _version_ | 1878407976592605185 |
|---|---|
| author | Iglesias, A. |
| author2 | Singh, S. K. Lowry, A. R. Kostoglodov, V. Larson, K. M. Franco-Sanchez, S. I. |
| author2_role | author author author author author |
| author_browse | Franco-Sanchez, S. I. Iglesias, A. Kostoglodov, V. Larson, K. M. Lowry, A. R. Singh, S. K. |
| author_facet | Iglesias, A. Singh, S. K. Lowry, A. R. Kostoglodov, V. Larson, K. M. Franco-Sanchez, S. I. |
| author_role | author |
| collection | Geofísica Internacional |
| description | We invert GPS position data to map fhe slip on the plate interface during an aseismic, slow~slip event, which occurred in 2002 in the Guerrero seismic gap of the M~xican subduction zone, lasted for -4 months, and was detected by 7 continuous GPS receivers located over an area of -550x250 km2. Our best model, under physically reasonable constraints, shows that the slow slip occurred on the transition zone at a distancejrange oflOO to 170 km from the trench. The average slip was about 22.5 em (Mo-2.97 xlOZ7 dyne-em, Mw=7.6). This model implies an increased shear stress at the bottom of the locked, seismogenic part of the interface which lies updip from the transition zone, and, hence, an enhanced seismic hazard. The results from other similar subduction zones also favor this model. However, we cannot rule out an alternative model that requires slow slip to invade the seismogenic zone as well. A definitive answer to this critical issue would require more GPS stations and long-term monitoring. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | MX_28fdd3e5e8df5ec0fd8c0de6a3400a0e |
| identifier_str_mv | 10.22201/igeof.00167169p.2004.43.3.953 |
| institution | UNAM |
| instname_str | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| language | spa eng |
| network_acronym_str | MX |
| network_name_str | México |
| oai_identifier_str | oai:revistagi.geofisica.unam.mx:article/953 |
| publishDate | 2004 |
| publishDateSort | 2004 |
| publisher | Universidad Nacional Autónoma de México. Instituto de Geofísica |
| publisherStr | Universidad Nacional Autónoma de México. Instituto de Geofísica |
| reponame_str | Geofísica Internacional |
| spelling | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications Iglesias, A. Singh, S. K. Lowry, A. R. Kostoglodov, V. Larson, K. M. Franco-Sanchez, S. I. Sismo lento Brecha sisimica de Guerrero GPS Slow earthquake Guerrero seismic gap We invert GPS position data to map fhe slip on the plate interface during an aseismic, slow~slip event, which occurred in 2002 in the Guerrero seismic gap of the M~xican subduction zone, lasted for -4 months, and was detected by 7 continuous GPS receivers located over an area of -550x250 km2. Our best model, under physically reasonable constraints, shows that the slow slip occurred on the transition zone at a distancejrange oflOO to 170 km from the trench. The average slip was about 22.5 em (Mo-2.97 xlOZ7 dyne-em, Mw=7.6). This model implies an increased shear stress at the bottom of the locked, seismogenic part of the interface which lies updip from the transition zone, and, hence, an enhanced seismic hazard. The results from other similar subduction zones also favor this model. However, we cannot rule out an alternative model that requires slow slip to invade the seismogenic zone as well. A definitive answer to this critical issue would require more GPS stations and long-term monitoring. Con el firi de determinar Ia distribucion de deslizarnientos debida a un sismo Iento que ocurrio en Ia interfase de las placas en la zona de la brecha sismica de Guerrero, llevarnos a cabo una inversion de los datos de posicion obtenidos a traves de estaciones GPS. Este sismo Iento, con duracion aproximada de 4 meses, fue registrado por 7 estaciones permanentes de GPS localizadas en un area de -550x250 km2• El mejor modelo obtenido, considerando algunas restricciones fisicarnente razonables, muestra que el deslizarniento ocurrio en la zona de transicion a una distancia de entre 100 y 170 km de la trinchera. El deslizarniento promedio obtenido fue de alrededor de 22.5 em (Mo-2.97 xl027 dyna-cm, Mw=7.6). Nuestro modelo implica un aumento en los esfuerzos de corte en la zona acoplada que se encuentra adyacente ala de transicion. Esta zona acoplada es Ia parte sismogenica de Ia interfase, por lo que este modelo implica un incremento en el peligro sismico en Ia region. Los resultados obtenidos para escenarios similares en otras zonas de subduccion favorecen tarnbien la eleccion de este modelo. Sin embargo, con los datos disponibles, no es posible descartar un modelo que requiere que el deslizarniento Iento invada tarnbien Ia zona sismogenica. Un mayor numero de estaciones de GPS, asi como un monitoreo mas prolongado de la deforrnacion, proporcionaria Ia informacion necesaria para discriminar entre ambos modelos. Universidad Nacional Autónoma de México. Instituto de Geofísica http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/953 10.22201/igeof.00167169p.2004.43.3.953 |
| spellingShingle | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications Iglesias, A. Sismo lento Brecha sisimica de Guerrero GPS Slow earthquake Guerrero seismic gap |
| status_str | publishedVersion |
| title | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| title_full | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| title_fullStr | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| title_full_unstemmed | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| title_short | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| title_sort | The silent earthquake of 2002 in the Guerrero seismic gap, Mexico (Mw=7.6): Inversion of slip on the plate interface and some implications |
| topic | Sismo lento Brecha sisimica de Guerrero GPS Slow earthquake Guerrero seismic gap |
| topic_facet | Sismo lento Brecha sisimica de Guerrero GPS Slow earthquake Guerrero seismic gap |
| url | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/953 |