FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR
The Ecuadorian shoreline is considered highly susceptible by impacts of tsunamis triggered by marine quakes or submarine landslides occurring close or nearby the subduction zone between the Nazca, Caribbean and South American plates. Since 1877 one dozen known tsunamis have been witnessed along this...
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| Format: | Article |
| Language: | English |
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Tsunami Society International
2014-01-01
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| Series: | Science of Tsunami Hazards |
| Subjects: | |
| Online Access: | http://tsunamisociety.org/331Chunga&Tsoulkeridis.pdf |
| _version_ | 1831545130990960640 |
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| author | Kervin Chunga Theofilos Toulkeridis |
| author_facet | Kervin Chunga Theofilos Toulkeridis |
| author_sort | Kervin Chunga |
| collection | DOAJ |
| description | The Ecuadorian shoreline is considered highly susceptible by impacts of tsunamis triggered by marine quakes or submarine landslides occurring close or nearby the subduction zone between the Nazca, Caribbean and South American plates. Since 1877 one dozen known tsunamis have been witnessed along this coast, mostly related to short-distanced seismic activities (earthquakes between Mw 6.9 to 8.8). However, no evidence of these impacts has been recorded in the sedimentary stratigraphy on the Ecuadorian platform so far. Nonetheless, in the southwestern part of the Gulf of Guayaquil, due to a biological, chemical, stratigraphic and geochronologic study of a few cored samples an anomalous horizon to the other sedimentary layers has been identified and recognized as a paleo-tsunami deposit. This layer having a thickness of up to 10 cm and up to 1100 meters away from the actual shore, demonstrates various criteria which confirm its origin such as deep sea foraminifera like Pullenia bulloides, run-up and backwash features, fragments of molluscs, which are absent in other sedimentary levels, matrix of weathered chlorite potentially originated by glauconite besides other. Geocronologic evidence together with the calculated sedimentation rate, implies that a the tsunami surged the coastal lowlands around Villamil Playas about 1250 ± 50 yrs ago and must have been a major event originated from the western or northwestern direction. |
| first_indexed | 2024-12-17T01:21:19Z |
| format | Article |
| id | doaj.art-9cd9ee23bbdc424fa00a89bbc52cea61 |
| institution | Directory Open Access Journal |
| issn | 8755-6839 |
| language | English |
| last_indexed | 2024-12-17T01:21:19Z |
| publishDate | 2014-01-01 |
| publisher | Tsunami Society International |
| record_format | Article |
| series | Science of Tsunami Hazards |
| spelling | doaj.art-9cd9ee23bbdc424fa00a89bbc52cea612022-12-21T22:08:48ZengTsunami Society InternationalScience of Tsunami Hazards8755-68392014-01-013315569FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADORKervin Chunga0Theofilos Toulkeridis 1Escuela de Ciencias Geológicas y Ambientales, Facultad de Ciencias Naturales, Universidad de Guayaquil, ECUADORUniversidad de las Fuerzas Armadas - ESPE, Campus Sangolquí, Sangolquí, ECUADORThe Ecuadorian shoreline is considered highly susceptible by impacts of tsunamis triggered by marine quakes or submarine landslides occurring close or nearby the subduction zone between the Nazca, Caribbean and South American plates. Since 1877 one dozen known tsunamis have been witnessed along this coast, mostly related to short-distanced seismic activities (earthquakes between Mw 6.9 to 8.8). However, no evidence of these impacts has been recorded in the sedimentary stratigraphy on the Ecuadorian platform so far. Nonetheless, in the southwestern part of the Gulf of Guayaquil, due to a biological, chemical, stratigraphic and geochronologic study of a few cored samples an anomalous horizon to the other sedimentary layers has been identified and recognized as a paleo-tsunami deposit. This layer having a thickness of up to 10 cm and up to 1100 meters away from the actual shore, demonstrates various criteria which confirm its origin such as deep sea foraminifera like Pullenia bulloides, run-up and backwash features, fragments of molluscs, which are absent in other sedimentary levels, matrix of weathered chlorite potentially originated by glauconite besides other. Geocronologic evidence together with the calculated sedimentation rate, implies that a the tsunami surged the coastal lowlands around Villamil Playas about 1250 ± 50 yrs ago and must have been a major event originated from the western or northwestern direction.http://tsunamisociety.org/331Chunga&Tsoulkeridis.pdfsedimentary faciesPaleo-tsunami depositsedimentary facies |
| spellingShingle | Kervin Chunga Theofilos Toulkeridis FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR Science of Tsunami Hazards sedimentary facies Paleo-tsunami deposit sedimentary facies |
| title | FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR |
| title_full | FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR |
| title_fullStr | FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR |
| title_full_unstemmed | FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR |
| title_short | FIRST EVIDENCE OF PALEO-TSUNAMI DEPOSITS OF A MAJOR HISTORIC EVENT IN ECUADOR |
| title_sort | first evidence of paleo tsunami deposits of a major historic event in ecuador |
| topic | sedimentary facies Paleo-tsunami deposit sedimentary facies |
| url | http://tsunamisociety.org/331Chunga&Tsoulkeridis.pdf |
| work_keys_str_mv | AT kervinchunga firstevidenceofpaleotsunamidepositsofamajorhistoriceventinecuador AT theofilostoulkeridis firstevidenceofpaleotsunamidepositsofamajorhistoriceventinecuador |