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Book Chapter

Comparing semiquantitative logic trees for archaeoseismology and paleoseismology: The Baelo Claudia (southern Spain) case study

By
Christoph Grützner
Christoph Grützner
Institute of Neotectonics and Natural Hazards, RWTH Aachen University, Lochnerstrasse 4-20, 52056 Aachen, Germany
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Klaus Reicherter
Klaus Reicherter
Institute of Neotectonics and Natural Hazards, RWTH Aachen University, Lochnerstrasse 4-20, 52056 Aachen, Germany
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Pablo G. Silva
Pablo G. Silva
Departamento de Geología, Universidad de Salamanca, Escuela Politécnica Superior de Ávila, Calle Hornos Caleros, 50, 05003 Ávila, Spain
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Published:
October 01, 2010

The Bolonia Bay, close to the Strait of Gibraltar, hosts the Roman ruins of Baelo Claudia. In the first and third century A.D., this ancient town was affected by two earthquakes. Several earthquake-related damages can be found inside the ruins, and the adjacent mountain ranges show features of Quaternary activity. Extensive paleoseismological and archaeoseismological investigations have been conducted at the archaeological site and in its environs. The first 14C dating results from damaged infrastructure are presented in this paper, together with the preliminary results of fault-trenching on one of the closest suspect seismogenic faults near the archaeological site. The observations have been quantified using the two logic trees for paleoseismology and archaeoseismology. Our results show that a mere paleoseismological classification of the geological features leads to a paleoseismic quality factor (PQF) of 0.03, which is low compared to other studies. Taking into account the additional information from archaeoseismological work (archaeoseismological quality factor [AQF] is 0.5), it becomes clear that the Baelo Claudia study site provides an opportunity for detailed earthquake investigations. Therefore, it has a high potential for reliable seismic hazard analyses. A complementary application of both logic trees is recommended in future studies if sufficient data are available.

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GSA Special Papers

Ancient Earthquakes

Manuel Sintubin
Manuel Sintubin
Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Celestijnenlaan, Leuven, Belgium
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Iain S. Stewart
Iain S. Stewart
School of Geography, Earth and Environmental Sciences, University of Plymouth, Fitzroy, Drake Circus, Plymouth, Devon, UK
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Tina M. Niemi
Tina M. Niemi
Department of Geosciences, University of Missouri-Kansas City, Kansas City, Missouri, USA
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Erhan Altunel
Erhan Altunel
Department of Geological Engineering, Eskisehir Osmangazi University, Eskisehir, Turkey
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Geological Society of America
Volume
471
ISBN print:
9780813724713
Publication date:
October 01, 2010

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