Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift

The study was conducted in the Panama Basin, a zone with a complex system of mid-ocean ridges (MORs), explaining its intriguing thermal and seismic qualities and thereby making it an integral place for research. Similarly, the Panama Basin is a bathymetrically restricted oceanic basin situated in th...

Full description

Autores:
Londoño Vargas, Juan Pablo
Tipo de recurso:
Trabajo de grado de pregrado
Fecha de publicación:
2023
Institución:
Universidad de los Andes
Repositorio:
Séneca: repositorio Uniandes
Idioma:
eng
OAI Identifier:
oai:repositorio.uniandes.edu.co:1992/64012
Acceso en línea:
http://hdl.handle.net/1992/64012
Palabra clave:
Costa Rica Rift
Slow-slip earthquake
Non-volcanic tremor
Reverse time migration
Geociencias
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
id UNIANDES2_29e7863c661a8b89374b7bb44e756af4
oai_identifier_str oai:repositorio.uniandes.edu.co:1992/64012
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repository_id_str
dc.title.none.fl_str_mv Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
title Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
spellingShingle Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
Costa Rica Rift
Slow-slip earthquake
Non-volcanic tremor
Reverse time migration
Geociencias
title_short Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
title_full Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
title_fullStr Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
title_full_unstemmed Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
title_sort Identification and localization of unknown seismic signals via reverse time migration within the Costa Rica Rift
dc.creator.fl_str_mv Londoño Vargas, Juan Pablo
dc.contributor.advisor.none.fl_str_mv Tary, Jean Baptiste
dc.contributor.author.none.fl_str_mv Londoño Vargas, Juan Pablo
dc.contributor.jury.none.fl_str_mv Poveda Núñez, Hugo Esteban
dc.subject.keyword.none.fl_str_mv Costa Rica Rift
Slow-slip earthquake
Non-volcanic tremor
Reverse time migration
topic Costa Rica Rift
Slow-slip earthquake
Non-volcanic tremor
Reverse time migration
Geociencias
dc.subject.themes.es_CO.fl_str_mv Geociencias
description The study was conducted in the Panama Basin, a zone with a complex system of mid-ocean ridges (MORs), explaining its intriguing thermal and seismic qualities and thereby making it an integral place for research. Similarly, the Panama Basin is a bathymetrically restricted oceanic basin situated in the Eastern Pacific near the subduction zone of Central and South America. A network of ocean bottom seismometers (OBS) was deployed in one of the mid ocean ridges, the Costa Rica Rift, and operated for 23 days from January 26 to February 16, 2015. Previous studies have used this data and discovered several microearthquakes following compelling spatiotemporal trends. Regardless, non-volcanic tremor indagation has remained quiet on this site. Non-volcanic tremors are the most familiar seismic waves detected during slow-slip events. They are weak continuous vibrations with no clear impulsive phases. We processed all available data from this network to investigate if non-volcanic tremors are occurring within the zone. To tackle the task, we developed a pipeline that consisted of generating seismograms, filtering them, extracting the event, and finally locating the events. We used the reverse time migration (RTM) technique to map the events since it detects and locates events with a low signal-to-noise ratio (SNR) with no need for phase identification or picking. We identified and mapped 226 possible tremor events in the vicinity of the Costa Rica Rift. They were compactly clustered around the southwest of the network, did not show temporal clusterization, and predominantly occurred on a day-by-day basis along the survey. The results are relevant since no non-volcanic tremor was reported either in that zone or in that tectonic setting (divergent margin). However, limited station availability in the last weeks and an incomplete location method could introduce biases in the results.
publishDate 2023
dc.date.accessioned.none.fl_str_mv 2023-01-19T19:55:41Z
dc.date.available.none.fl_str_mv 2023-01-19T19:55:41Z
dc.date.issued.none.fl_str_mv 2023-01-18
dc.type.es_CO.fl_str_mv Trabajo de grado - Pregrado
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/bachelorThesis
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dc.language.iso.es_CO.fl_str_mv eng
language eng
dc.rights.license.spa.fl_str_mv Atribución-NoComercial 4.0 Internacional
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dc.format.extent.es_CO.fl_str_mv 36 páginas
dc.format.mimetype.es_CO.fl_str_mv application/pdf
dc.publisher.es_CO.fl_str_mv Universidad de los Andes
dc.publisher.program.es_CO.fl_str_mv Geociencias
dc.publisher.faculty.es_CO.fl_str_mv Facultad de Ciencias
dc.publisher.department.es_CO.fl_str_mv Departamento de Geociencias
institution Universidad de los Andes
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spelling Atribución-NoComercial 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Tary, Jean Baptistea4a003f8-5cbc-40e3-92a3-f86c011c9cf0600Londoño Vargas, Juan Pablo37afb24e-76b2-4f61-9b2d-b2640b65e3e9600Poveda Núñez, Hugo Esteban2023-01-19T19:55:41Z2023-01-19T19:55:41Z2023-01-18http://hdl.handle.net/1992/64012instname:Universidad de los Andesreponame:Repositorio Institucional Sénecarepourl:https://repositorio.uniandes.edu.co/The study was conducted in the Panama Basin, a zone with a complex system of mid-ocean ridges (MORs), explaining its intriguing thermal and seismic qualities and thereby making it an integral place for research. Similarly, the Panama Basin is a bathymetrically restricted oceanic basin situated in the Eastern Pacific near the subduction zone of Central and South America. A network of ocean bottom seismometers (OBS) was deployed in one of the mid ocean ridges, the Costa Rica Rift, and operated for 23 days from January 26 to February 16, 2015. Previous studies have used this data and discovered several microearthquakes following compelling spatiotemporal trends. Regardless, non-volcanic tremor indagation has remained quiet on this site. Non-volcanic tremors are the most familiar seismic waves detected during slow-slip events. They are weak continuous vibrations with no clear impulsive phases. We processed all available data from this network to investigate if non-volcanic tremors are occurring within the zone. To tackle the task, we developed a pipeline that consisted of generating seismograms, filtering them, extracting the event, and finally locating the events. We used the reverse time migration (RTM) technique to map the events since it detects and locates events with a low signal-to-noise ratio (SNR) with no need for phase identification or picking. We identified and mapped 226 possible tremor events in the vicinity of the Costa Rica Rift. They were compactly clustered around the southwest of the network, did not show temporal clusterization, and predominantly occurred on a day-by-day basis along the survey. The results are relevant since no non-volcanic tremor was reported either in that zone or in that tectonic setting (divergent margin). 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