Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia
The Bucaramanga Fault is the fault in Colombia with the strongest physiographic expression. It extends from Aguachica in the north southward to Bucaramanga and beyond. Abundant morphotectonic indices testify to a high degree of activity during the Quaternary. A recent detailed regional study along t...
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| Format: | Online |
| Language: | spa |
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Universidad Pedagógica y Tecnológica de Colombia - UPTC
2009
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| Online Access: | https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/903 |
| _version_ | 1801706679655464960 |
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| author | Diederix, Hans Hernández, Catalina Torres, Eliana Osorio, Jairo Alonso Botero, Paola |
| author_facet | Diederix, Hans Hernández, Catalina Torres, Eliana Osorio, Jairo Alonso Botero, Paola |
| author_sort | Diederix, Hans |
| collection | OJS |
| description | The Bucaramanga Fault is the fault in Colombia with the strongest physiographic expression. It extends from Aguachica in the north southward to Bucaramanga and beyond. Abundant morphotectonic indices testify to a high degree of activity during the Quaternary. A recent detailed regional study along the main fault corridor has identified several promising locations with potential for paleoseismologic trench studies. The site actually selected was situated in a limestone quarry at 4,5 km north of Bucaramanga town on the north bank of the Surata river. It concerns a small tectonic basin in a hanging valley situated 250 m to the west of the main Bucaramanga Fault and is filled with a series of colluvial wedges and fine grained lacustrine deposits with abundant organic material. Detailed logging of the outcrop face at a scale of 1:10 was carried out and seventeen samples were taken from the organic rich levels for radiocarbon dating. Basin evolution is controlled by movement of the principal fault trace in which each sedimentary level is a registration of co-seismic subsidence and represents the stratigraphic evidence of pre-historic earthquakes. The result of radiocarbon dating show ages that range from 8300-930 y/BP and a preliminary interpretation suggests the occurrence of 8 holocene seismic events during the last 8300 years and magnitudes in the order of 6,5-7,0 Ms. |
| format | Online |
| id | oai:oai.revistas.uptc.edu.co:article-903 |
| institution | Revista Ingeniería, Investigación y Desarrollo |
| language | spa |
| publishDate | 2009 |
| publisher | Universidad Pedagógica y Tecnológica de Colombia - UPTC |
| record_format | ojs |
| spelling | oai:oai.revistas.uptc.edu.co:article-9032017-09-07T22:45:14Z Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia Resultados preliminares del primer estudio paleosismológico a lo largo de la falla de Bucaramanga, Colombia Diederix, Hans Hernández, Catalina Torres, Eliana Osorio, Jairo Alonso Botero, Paola Bucaramanga fault neotectonics paleoseismology sagpond seismic stratigraphy seismic hazard sagpond estratigrafía sísmica amenaza sísmica falla de Bucaramanga neotectónica paleosismología The Bucaramanga Fault is the fault in Colombia with the strongest physiographic expression. It extends from Aguachica in the north southward to Bucaramanga and beyond. Abundant morphotectonic indices testify to a high degree of activity during the Quaternary. A recent detailed regional study along the main fault corridor has identified several promising locations with potential for paleoseismologic trench studies. The site actually selected was situated in a limestone quarry at 4,5 km north of Bucaramanga town on the north bank of the Surata river. It concerns a small tectonic basin in a hanging valley situated 250 m to the west of the main Bucaramanga Fault and is filled with a series of colluvial wedges and fine grained lacustrine deposits with abundant organic material. Detailed logging of the outcrop face at a scale of 1:10 was carried out and seventeen samples were taken from the organic rich levels for radiocarbon dating. Basin evolution is controlled by movement of the principal fault trace in which each sedimentary level is a registration of co-seismic subsidence and represents the stratigraphic evidence of pre-historic earthquakes. The result of radiocarbon dating show ages that range from 8300-930 y/BP and a preliminary interpretation suggests the occurrence of 8 holocene seismic events during the last 8300 years and magnitudes in the order of 6,5-7,0 Ms. La Falla de Bucaramanga es la de mayor expresión fisiográfica en Colombia, se extiende desde Aguachica, en el norte, hacia Bucaramanga, en el Sur, y exhibe indicios morfotectónicos que atestiguan un alto grado de actividad durante el Cuaternario. Un reciente levantamiento neotectónico detallado en el corredor de la falla permitió identificar sitios con potencial paleosismológico. El sitio seleccionado está en una cantera de calizas a 4,5 kilómetros al norte de Bucaramanga, en el flanco norte del río Suratá. Corresponde a una cuenca colgada de origen tectónico a 250 m al oeste de la traza principal, rellenada por cuñas coluviales y una secuencia reciente de horizontes lacustre finos con material orgánico. Se realizó un levantamiento detallado a escala 1:10 y se tomaron diecisiete muestras que cubren el paquete de sedimentos orgánicos. Se interpreta como una cuenca tectónica o "sagpond" controlada por la falla principal, donde cada horizonte sedimentario registra el hundimiento co-sísmico, es decir, la evidencia estratigráfica de sismos prehistóricos. Los resultados de C14 oscilan entre 8300-930 años-BP, y su interpretación preliminar apunta a la ocurrencia de 8 sismos holocenos con intervalos de recurrencia de aproximadamente1000 años y magnitudes entre 7,0-7,4 Ms. Universidad Pedagógica y Tecnológica de Colombia - UPTC 2009-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/903 Ingeniería Investigación y Desarrollo; Vol. 9 No. 2: julio-diciembre de 2009; 18-23 Ingeniería Investigación y Desarrollo; Vol. 9 Núm. 2: julio-diciembre de 2009; 18-23 2422-4324 1900-771X spa https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/903/903 Derechos de autor 2009 Ingeniería Investigación y Desarrollo |
| spellingShingle | Bucaramanga fault neotectonics paleoseismology sagpond seismic stratigraphy seismic hazard sagpond estratigrafía sísmica amenaza sísmica falla de Bucaramanga neotectónica paleosismología Diederix, Hans Hernández, Catalina Torres, Eliana Osorio, Jairo Alonso Botero, Paola Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title | Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title_alt | Resultados preliminares del primer estudio paleosismológico a lo largo de la falla de Bucaramanga, Colombia |
| title_full | Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title_fullStr | Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title_full_unstemmed | Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title_short | Preliminary results of the first paleoseismologic study along the Bucaramanga fault, Colombia |
| title_sort | preliminary results of the first paleoseismologic study along the bucaramanga fault colombia |
| topic | Bucaramanga fault neotectonics paleoseismology sagpond seismic stratigraphy seismic hazard sagpond estratigrafía sísmica amenaza sísmica falla de Bucaramanga neotectónica paleosismología |
| topic_facet | Bucaramanga fault neotectonics paleoseismology sagpond seismic stratigraphy seismic hazard sagpond estratigrafía sísmica amenaza sísmica falla de Bucaramanga neotectónica paleosismología |
| url | https://revistas.uptc.edu.co/index.php/ingenieria_sogamoso/article/view/903 |
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