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POSSIBLE RAPID STRAIN ACCUMULATION RATES NEAR CALI, COLOMBIA, DETERMINED FROM GPS MEASUREMENTS.

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Title: POSSIBLE RAPID STRAIN ACCUMULATION RATES NEAR CALI, COLOMBIA, DETERMINED FROM GPS MEASUREMENTS.
Authors: Trenkamp, Robert1, Mora P., Héctor2, Salcedo H., Elkin3, Kellogg, James N.1
Source: Earth Sciences Research Journal. Dec2004, Vol. 8 Issue 1, p25-33. 9p.
Subjects: Seismology, Earthquakes
Geographic Terms: Cali (Colombia), Andes, Panama, Armenia
Abstract (English): Global Positioning System (GPS) data from southern Central America and northwestern South America collected between 1991 and 1998 reveal wide plate margin deformation along a 1400 km length of the North Andes. Also associated with the oblique subduction of the Nazca plate at the Colombia-Ecuador trench is the 'escape' of the North Andes block (NAB). The NAB is delineated by the Bocono-East Andean fault systems and the Dolores Guayaquil Megasheare to the east, the South Caribbean deformed belt on the north and the Colombia-Ecuador trench and Panama on the west. Within the NAB many damaging crustal earthquakes have occurred which is most recently exemplified on January 25, 1999 (Mw = 6.1) Armenia earthquake. Preliminary analysis of recent occupations (2003 GEORED GPS) of several previously observed (1996-2001) GPS sites suggest shear strain accumulation rates in the Cauca valley near Cali of approximately 2.1 × 10-7 yr-1 and 1.6 × 10-7 yr-1. These strain rates are measured within 2 Delaunay triangles with common vertices at Cali and Restrepo, which encompass areas, located north and west of Cali. Seismicity has been monitored in the Cauca Valley for the last 17 years by the "Observatorio Sismolégico del Suroccidente" (OSSO) since 1987 and by the Red Sismolégica Nacional del INGEOMINAS since 1993. Their catalogs list numerous shallow earthquakes near Cali but nothing larger than magnitude 5. Historically, however, several large earthquakes are associated with the "Falla Cauca Almaguer" in locations both to the south and north of Cali in the Cauca valley. Preliminary calculations using the strain rates determined for these Delaunay triangles and a simplified Kostrov formula suggest possible decadal (30 . 90 years) recurrence intervals for Mw = 6.0 . 6.3 earthquakes, centenary (90 . 900 years) recurrence intervals for Mw = 6.4 . 6.9 earthquakes and millennial (900+ years) recurrence intervals for Mw ≥ 7 earthquakes. [ABSTRACT FROM AUTHOR]
Abstract (Spanish): Los datos del sistema de posición global registrado desde la zona meridional de Centro América y el Noroccidente de Sur Amórica, tomados en el periodo que comprende 1991 y 1998 revelan un amplio margen de deformación a lo largo de los 1400 kilómetros de longitud al norte de los Andes. Igualmente asociado a la subducción oblicua de la placa de Nazca en el corte de Colombia y Ecuador es el escape del bloque Norandino (NAB). El NAB está delineado por el sistema andino de fallas Bocono y el gran corte de Dolores, Guayaquil al este; el cinturon del Caribe sur; el corte de Colombia Ecuador, al norte, y Panamó, al oeste. Dentro de esta zona han ocurrido muchos terremotos; como ejemplo está el más reciente, ocurrido el 25 de enero de 1999 en Armenia (Mw = 6.1). Los análisis preliminares de recientes ocupaciones (2003 GEORED GPS) de muchos GPS previamente observados (1996-2001) sugieren que la tensión en la acumulación de los cortes en el valle del Cauca, cerca de a Cali, son de aproximadamente 2.1 × 10-7 yr-1 y 1.6 · 10-7 yr-1. Estas velocidades de tensión son medidas dentro de los dos triángulos Delaunay con vértices comunes en Cali y Restrepo, que comprometen áreas localizadas al norte y occidente de Cali. Desde 1987 la sismología del valle del Cauca ha estado monitoreada por el Observatorio Sismológico del Sur Occidente (OSSO) y desde 1993 por la red sismológica Nacional de Ingeominas. Se cataloga una lista de leves terremotos cerca a Cali, pero ninguno mayor a una magnitud de 5. Sin embargo históricamente muchos terremotos están asociados a la "falla Cauca Almaguer" en localidades cerca al sur y al norte de Cali en el valle del Cauca. Cálculos preliminares realizados con velocidades de tension determinadas por estos triángulos Delaunay y la fórmula simplificada de Kostroy que sugiere posibles intervalos recurrentes de algunas décadas (30 a 90 años) para terremotos Mw = 6.0 . 6.3; intervalos centenarios (90 . 900 años) de terremotos Mw. = 6.4 . 6.9 e intervalos milenarios (900 años o más) para terremotos de Mw ≥ 7. [ABSTRACT FROM AUTHOR]
Copyright of Earth Sciences Research Journal is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: POSSIBLE RAPID STRAIN ACCUMULATION RATES NEAR CALI, COLOMBIA, DETERMINED FROM GPS MEASUREMENTS.
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  Data: <searchLink fieldCode="DE" term="%22Seismology%22">Seismology</searchLink><br /><searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Cali+%28Colombia%29%22">Cali (Colombia)</searchLink><br /><searchLink fieldCode="DE" term="%22Andes%22">Andes</searchLink><br /><searchLink fieldCode="DE" term="%22Panama%22">Panama</searchLink><br /><searchLink fieldCode="DE" term="%22Armenia%22">Armenia</searchLink>
– Name: Abstract
  Label: Abstract (English)
  Group: Ab
  Data: Global Positioning System (GPS) data from southern Central America and northwestern South America collected between 1991 and 1998 reveal wide plate margin deformation along a 1400 km length of the North Andes. Also associated with the oblique subduction of the Nazca plate at the Colombia-Ecuador trench is the 'escape' of the North Andes block (NAB). The NAB is delineated by the Bocono-East Andean fault systems and the Dolores Guayaquil Megasheare to the east, the South Caribbean deformed belt on the north and the Colombia-Ecuador trench and Panama on the west. Within the NAB many damaging crustal earthquakes have occurred which is most recently exemplified on January 25, 1999 (Mw = 6.1) Armenia earthquake. Preliminary analysis of recent occupations (2003 GEORED GPS) of several previously observed (1996-2001) GPS sites suggest shear strain accumulation rates in the Cauca valley near Cali of approximately 2.1 × 10-7 yr-1 and 1.6 × 10-7 yr-1. These strain rates are measured within 2 Delaunay triangles with common vertices at Cali and Restrepo, which encompass areas, located north and west of Cali. Seismicity has been monitored in the Cauca Valley for the last 17 years by the "Observatorio Sismolégico del Suroccidente" (OSSO) since 1987 and by the Red Sismolégica Nacional del INGEOMINAS since 1993. Their catalogs list numerous shallow earthquakes near Cali but nothing larger than magnitude 5. Historically, however, several large earthquakes are associated with the "Falla Cauca Almaguer" in locations both to the south and north of Cali in the Cauca valley. Preliminary calculations using the strain rates determined for these Delaunay triangles and a simplified Kostrov formula suggest possible decadal (30 . 90 years) recurrence intervals for Mw = 6.0 . 6.3 earthquakes, centenary (90 . 900 years) recurrence intervals for Mw = 6.4 . 6.9 earthquakes and millennial (900+ years) recurrence intervals for Mw ≥ 7 earthquakes. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Spanish)
  Group: Ab
  Data: Los datos del sistema de posición global registrado desde la zona meridional de Centro América y el Noroccidente de Sur Amórica, tomados en el periodo que comprende 1991 y 1998 revelan un amplio margen de deformación a lo largo de los 1400 kilómetros de longitud al norte de los Andes. Igualmente asociado a la subducción oblicua de la placa de Nazca en el corte de Colombia y Ecuador es el escape del bloque Norandino (NAB). El NAB está delineado por el sistema andino de fallas Bocono y el gran corte de Dolores, Guayaquil al este; el cinturon del Caribe sur; el corte de Colombia Ecuador, al norte, y Panamó, al oeste. Dentro de esta zona han ocurrido muchos terremotos; como ejemplo está el más reciente, ocurrido el 25 de enero de 1999 en Armenia (Mw = 6.1). Los análisis preliminares de recientes ocupaciones (2003 GEORED GPS) de muchos GPS previamente observados (1996-2001) sugieren que la tensión en la acumulación de los cortes en el valle del Cauca, cerca de a Cali, son de aproximadamente 2.1 × 10-7 yr-1 y 1.6 · 10-7 yr-1. Estas velocidades de tensión son medidas dentro de los dos triángulos Delaunay con vértices comunes en Cali y Restrepo, que comprometen áreas localizadas al norte y occidente de Cali. Desde 1987 la sismología del valle del Cauca ha estado monitoreada por el Observatorio Sismológico del Sur Occidente (OSSO) y desde 1993 por la red sismológica Nacional de Ingeominas. Se cataloga una lista de leves terremotos cerca a Cali, pero ninguno mayor a una magnitud de 5. Sin embargo históricamente muchos terremotos están asociados a la "falla Cauca Almaguer" en localidades cerca al sur y al norte de Cali en el valle del Cauca. Cálculos preliminares realizados con velocidades de tension determinadas por estos triángulos Delaunay y la fórmula simplificada de Kostroy que sugiere posibles intervalos recurrentes de algunas décadas (30 a 90 años) para terremotos Mw = 6.0 . 6.3; intervalos centenarios (90 . 900 años) de terremotos Mw. = 6.4 . 6.9 e intervalos milenarios (900 años o más) para terremotos de Mw ≥ 7. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Earth Sciences Research Journal is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        StartPage: 25
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      – SubjectFull: Seismology
        Type: general
      – SubjectFull: Earthquakes
        Type: general
      – SubjectFull: Cali (Colombia)
        Type: general
      – SubjectFull: Andes
        Type: general
      – SubjectFull: Panama
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      – SubjectFull: Armenia
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      – TitleFull: POSSIBLE RAPID STRAIN ACCUMULATION RATES NEAR CALI, COLOMBIA, DETERMINED FROM GPS MEASUREMENTS.
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              Text: Dec2004
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