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Previous approaches to earthquakes in archaeology, characterizing the geoarchaeological subfield archaeoseismology, have focused on types of seismic destructions and anti-seismic constructions in architectural remains. A challenge often raised in archaeoseismology relates to issues of equifinality since other human or environmental factors can also cause the archaeoseismc types in question. Furthermore, geological markers of earthquakes are rarely identified directly, i.e., stratigraphically, with archaeoseismic evidence. To address these challenges, this paper offers a methodological innovation through the geoarchaeological subfield of soil micromorphology to investigate earthquakes in the form of seismically triggered soft sediment deformation structures (SSDS) in direct stratigraphic association with architecture. Applications to the case of Helike in Greece — infamous victim of a major earthquake in 373 BCE — reveal not only key evidence for three earthquake events in the form of seismically triggered SSDS but also other geological hazards, including flooding and rapid coastal change, in association with Hellenistic period (late fourth to second century BCE) architecture. The results offer advancements for archaeology and suggest that geoarchaeology and soil micromorphology applications become standard in archaeology, particularly archaeoseismology, for the identification and interpretation of earthquakes. These advancements offer new avenues for exploring geological aspects of the human past. • Innovations in archaeological soil micromorphology can identify seismic deformation. • Earthquakes deform archaeological soils and sediments. • Hydromorphic conditions amplify earthquake deformation in soils and sediments. • Mw 5 or greater earthquakes cause architectural destruction and sediment deformation. • Archaeoseismology and soil micromorphology are subfields of geoarchaeology. [ABSTRACT FROM AUTHOR]

Abstract: This paper deals with the palaeoenvironmental reconstruction of the area surrounding the remnant arch of the ancient bridge of Klidhi, Thessaloniki Plain, Greece. 19th century travellers and 20th century historians discussed the age of the monument and concluded that it was built during Late Roman Times (3rd Cent. AD) and supported a branch of the Via Egnatia road. However, few studies have considered the environmental context of the construction of the bridge, and until now, only two hypotheses have been presented: The bridge was built on or over a junction of the Aliakmon and Loudias Rivers, or on a coastal barrier. Within the framework of a geoarchaeological project developed in April 2008, five boreholes were drilled and the sediment cores analysed for microfauna and sedimentology. Seven 14C AMS dates provided a chronostratigraphic sequence and helped to define the geomorphological evolution of the area. Spatial interpretation of the results was possible using a Landsat TM image (False Colour Composite – FCC). Our data indicate the gradual transition of the site from a marine to a terrestrial environment during Ancient Times. Lagoonal conditions dominated during the construction of the bridge and the presence of a palaeochannel of the Aliakmon River was later revealed (transition from Byzantine and Ottoman periods), overlying sediments of a coastal barrier. [Copyright &y& Elsevier]