The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina)
This research covers the study of the first month of data from a local seismological network deployed after the MW 6.4, January 18, 2021, San Juan earthquake, over the central Chilean-Pampean flat slab. Almost 1000 seismic events were detected in the first month after the MW 6.4 earthquake occurred,...
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GeoScienceWorld
2025-04-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2025/lithosphere_2024_191/653734/lithosphere_2024_191.pdf |
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| author | Silvina Nacif Andrés Nacif Laura B. Godoy Marianela Lupari Raquel Villegas Mario Gimenez Andrés Folguera Aixa Rodriguez Silvana Spagnotto Francisco Ruiz |
| author_facet | Silvina Nacif Andrés Nacif Laura B. Godoy Marianela Lupari Raquel Villegas Mario Gimenez Andrés Folguera Aixa Rodriguez Silvana Spagnotto Francisco Ruiz |
| author_sort | Silvina Nacif |
| collection | DOAJ |
| description | This research covers the study of the first month of data from a local seismological network deployed after the MW 6.4, January 18, 2021, San Juan earthquake, over the central Chilean-Pampean flat slab. Almost 1000 seismic events were detected in the first month after the MW 6.4 earthquake occurred, with ML magnitude ranging from −0.2 to 4.3. The majority of the seismic events were relocated at a depth of around 14 km and distributed in a northeast–southwest direction. The focal mechanism solutions obtained represent the rupture main process with one of their nodal planes according to the epicentral distribution, from which we can define the rupture dip to 61°. On the other hand, quickly after the MW 6.4 earthquake occurred, a nearby region at shallower depths became activated, from which Differential Synthetic Aperture Radar Interferometry results show vertical movements. In the epicentral area and concordance with the northeast–southwest rupture region, we found a low of the analytical signal which extends in the same strike by approximately 80 km to the most populated region in the San Juan Province. Considering the closeness of the greatest earthquakes that shocked the eastern sector of the San Juan Province to the subducted Juan Fernandez Ridge track, and the direction of the rupture process, we infer its influence as one of the significant factors that contributes to the high seismic activity in this region. |
| format | Article |
| id | doaj-art-982f24ae00f24d3ca969066ba4e8dd8e |
| institution | OA Journals |
| issn | 1941-8264 1947-4253 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj-art-982f24ae00f24d3ca969066ba4e8dd8e2025-08-20T02:34:57ZengGeoScienceWorldLithosphere1941-82641947-42532025-04-012025210.2113/2025/lithosphere_2024_191The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina)Silvina Nacif0https://orcid.org/0000-0002-2486-1732Andrés Nacif1https://orcid.org/0000-0001-9673-6204Laura B. Godoy2https://orcid.org/0000-0002-4791-4403Marianela Lupari3https://orcid.org/0000-0002-3776-7665Raquel Villegas4https://orcid.org/0000-0003-3177-6402Mario Gimenez5https://orcid.org/0000-0002-7495-2448Andrés Folguera6https://orcid.org/0000-0001-8965-8543Aixa Rodriguez7https://orcid.org/0000-0002-5424-9376Silvana Spagnotto8https://orcid.org/0000-0003-3478-554XFrancisco Ruiz9https://orcid.org/0000-0001-7444-557XInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaInstituto de Estudios Andinos, Universidad Nacional de Buenos Aires, Conicet, Buenos Aires, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaCONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Av. Rivadavia 1917 (C1033AAJ), Buenos Aires, ArgentinaInstituto Geofísico Sismológico F. Volponi, FCEFyN, Universidad Nacional de San Juan (UNSJ), Rivadavia, San Juan, ArgentinaThis research covers the study of the first month of data from a local seismological network deployed after the MW 6.4, January 18, 2021, San Juan earthquake, over the central Chilean-Pampean flat slab. Almost 1000 seismic events were detected in the first month after the MW 6.4 earthquake occurred, with ML magnitude ranging from −0.2 to 4.3. The majority of the seismic events were relocated at a depth of around 14 km and distributed in a northeast–southwest direction. The focal mechanism solutions obtained represent the rupture main process with one of their nodal planes according to the epicentral distribution, from which we can define the rupture dip to 61°. On the other hand, quickly after the MW 6.4 earthquake occurred, a nearby region at shallower depths became activated, from which Differential Synthetic Aperture Radar Interferometry results show vertical movements. In the epicentral area and concordance with the northeast–southwest rupture region, we found a low of the analytical signal which extends in the same strike by approximately 80 km to the most populated region in the San Juan Province. Considering the closeness of the greatest earthquakes that shocked the eastern sector of the San Juan Province to the subducted Juan Fernandez Ridge track, and the direction of the rupture process, we infer its influence as one of the significant factors that contributes to the high seismic activity in this region.https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2025/lithosphere_2024_191/653734/lithosphere_2024_191.pdf |
| spellingShingle | Silvina Nacif Andrés Nacif Laura B. Godoy Marianela Lupari Raquel Villegas Mario Gimenez Andrés Folguera Aixa Rodriguez Silvana Spagnotto Francisco Ruiz The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) Lithosphere |
| title | The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) |
| title_full | The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) |
| title_fullStr | The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) |
| title_full_unstemmed | The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) |
| title_short | The Oblique Rupture of the Strike-Slip January 18, 2021, MW 6.4 Earthquake and Triggered Events from a Local Seismic Network (San Juan Province, Argentina) |
| title_sort | oblique rupture of the strike slip january 18 2021 mw 6 4 earthquake and triggered events from a local seismic network san juan province argentina |
| url | https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2025/lithosphere_2024_191/653734/lithosphere_2024_191.pdf |
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