ESMERALDAS

Type Oceanographic cruise
Ship L'Atalante
Ship owner Ifremer
Dates 14/03/2005 - 07/04/2005
Chief scientist(s) PONTOISE Bernard, CHARVIS Philippe

INSTITUT DE PHYSIQUE DU GLOBE DE PARIS - UMR 7154, UMS 3454

1 rue Jussieu

75005 Paris

+33 (0)1 83 95 74 00

https://www.ipgp.fr/
DOI 10.17600/5010020
Objective

The ESMERALDAS cruise (14 March - 7 April) aimed to examine the structure and shape of the contact area of the two plates, where very large seisms began, to a depth of 30 to 50 km. The Esmeraldas-Tumaco site, straddling the Equator and Colombia, was selected. The sector was affected by four very large scale historic quakes. The submarine seismological stations were constructed by the IRD and deployed by L'Atalante. The seismic source used (eight 16 liter Bolt Air-Guns, fired every 150m) was entirely satisfactory (over 18,000 shots). The full network, made up of some fifty underwater (26) and land-based (28) station also worked to our satisfaction. Interpreting the signals recorded will provide a true 3D active tomography of the sector. The network will then be maintained until 2005 to record natural seismicity, revealing the accumulation of constraints in the area. This will be used for a 3D active tomography to supplement the active tomography and the analysis of the constraints regime for the sector.

Data managed by SISMER

Bibliography

Publications

Collot J‐y, Proust J‐n., Nocquet J‐m, Martillo C., Michaud F., Lebrun J‐f., Schenini L., Popescu S., Hernandez M‐j., Ratzov Gueorgui (2022). From long‐ to short‐term inter‐plate coupling at the subducted Carnegie Ridge crest, offshore Central Ecuador. Journal Of Geophysical Research-solid Earth, 127(8), e2022JB024192 (26p.). Publisher's official version : https://doi.org/10.1029/2022JB024192 , Open Access version : https://archimer.ifremer.fr/doc/00788/89974/


Collot Jean-Yves, Ratzov Gueorgui, Silva P., Proust J.‐n., Migeon Sebastien, Hernandez M.‐j., Michaud F., Pazmino A., Barba Castillo D., Alvarado A., Khumara S. (2019). The Esmeraldas Canyon: a helpful marker of the Pliocene‐Pleistocene tectonic deformation of the north Ecuador southwest Colombia convergent margin. Tectonics, 38(8), 3140-3166. Publisher's official version : https://doi.org/10.1029/2019TC005501 , Open Access version : https://archimer.ifremer.fr/doc/00509/62060/


Garcia Cano Lina Constanza, Galve Audrey, Charvis Philippe, Marcaillou Boris (2014). Three-dimensional velocity structure of the outer fore arc of the Colombia-Ecuador subduction zone and implications for the 1958 megathrust earthquake rupture zone. Journal Of Geophysical Research-solid Earth, 119(2), 1041-1060. https://doi.org/10.1002/2012JB009978


References of Articles published in other Periodicals or Scientific Works acclaimed in the Field

Manchuel, K., B. Pontoise, N. Béthoux et al., Sismicidad e implicaciones estructurales en el área de Esmeraldas (Norte de Ecuador): a partir de los experimentos Sublime y Esmeraldas, in Geología y geofísica marina y terrestre del Ecuador desde la costa continental hasta las islas Galápagos, edited by Collot J-Y, V. Sallares, and A. Pazmiño, pp., CNDM-INOCAR-IRD, Guayaquil, in press, 2009

References of Technical Reports

Pontoise, B. et le groupe Esmeraldas - Rapport de la mission Esmeraldas (14 avril - 7 mai 2005).

References of International Seminar Communications

Pontoise B., Charvis Ph. and the Esmeraldas group. The ESMERALDAS experiment offshore - onshore North Ecuador - South Colombia : Investigations on margin segmentation and earthquake generation. EGU Annual Meeting 2006, Vienne

Pontoise B., Charvis Ph. and the Esmeraldas group. The ESMERALDAS experiment offshore - onshore North Ecuador - South Colombia. Geodynamics and Environment in East Asia International Conference, Taiwan (Nov.2005)

DEA or MASTER 2 using campaign data

de la Torre G. - Étude de la structure profonde de la marge convergente du nord de l?Équateur à partir de la modélisation de profils de sismique grand-angle de la campagne Esmeraldas, INOCAR, Équateur - Stage effectué à l?UMR Géoazur du 17 décembre 2006 au 9 mars 2007. Financement DSF IRD (Encadrants A. Gailler et Ph. Charvis), 2007.

Thesis using campaign data

Gonzalez Miguel (2018). Nature et origine des dépôts sédimentaires de la fosse de subduction d’Equateur : implications paléosismologiques / Nature and origin of sedimentary deposits in the Ecuador subduction trench : paleoseismological implications. PhD Thesis, Université de Rennes.


Lina Constanza « Imagerie sismique 3D de la zone de subduction à la frontière Colombie-Équateur ». Thèse UNS soutenue le 20/07/2009 (Directeurs P. Charvis et A. Galve)

Kevin Manchuel « Sismicité de la zone de subduction à la frontière Colombie-Équateur »Thèse UNS en cours (Directeurs Bethoux et Régnier).