SEDIMENTARY RECORD OF HISTORICAL TSUNAMIS IN THE BAY OF CADIZ (SPAIN) Javier Lario UNED(Universidad Nacional de Educacion a Distancia, Madrid) Museo Nacional.

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Presentation transcript:

SEDIMENTARY RECORD OF HISTORICAL TSUNAMIS IN THE BAY OF CADIZ (SPAIN) Javier Lario UNED(Universidad Nacional de Educacion a Distancia, Madrid) Museo Nacional de Ciencias Naturales, CSIC (Madrid) Marrakech, 07

H4 spit barrier tsunami deposits Lisbon tsunami Described by Dabrio et al., 1997; Luque at al., 1999, 2000 At least 4 washover fans 19 cores 3 sandy units related with 3 wave flooding

H3 spit barrier tsunami deposits 10 washover fans yrBP

TAP-01-1 TAP-01-2 TAP-01-3

Grain size

TAP-1-02 TAP-1-01

Doñana spit barrier high-energy/tsunami deposits

GEOLOGICAL RECORD During Late Holocene: Almost two tsunamis in Gulf of Cadiz with destructive effects Geomorphological, sedimentological and palaeontological record, that support the historical and archeological record Essential to calculate recurrence periods

Registro geológico (Andrade, 1992; Kortekaas, 2002; Tuttle et al., 2004; Kortekass & Dawson, 2007)

ca CalBPHigh energy event. storm? ca CalBP High energy event. storm? ca CalBPHigh energy event. ca CalBPHigh energy event: tsunami + storm surge alla round the coast Tsunami: sure in Valdelagrana at ca CalBP (Luque et al., 2003) correlation possible with others event in the coast ca CalBP High energy event. ca CalBP High energy event ADTsunami (Lisbon earthquake). Not always we founf geological record. Lack in dating sediments associated with this event High energy events in Gulf of Cadiz No enough data to calculate recurrence periods Need to be correlated with other records (tsunamites?)

Future

Otros Eventos de Alta Energía

Rio Piedras estuary Huelva Tinto-Odiel Estuary

19 cores (6 to 23 m)

Past/Now/Next LithologyLithology Grain size (high resolution)Grain size (high resolution) Environmental magnetismEnvironmental magnetism Palaeontology (micro and micro)Palaeontology (micro and micro) GeochemistryGeochemistry MineralogyMineralogy Radiocarbon datingRadiocarbon dating Identification of high energy event Differentiate tsunamis from storms