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6 Strand 5: Just Part of the Problem
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Published:February 2023
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Abstract
The identification of ancient tsunamis requires thinking that extends beyond any one site. Tsunamis are part of a much larger environmental response to driving mechanisms such as earthquakes. By looking at other environmental responses therefore, it is possible to know that there has been a past tsunami without actually finding physical evidence for the event itself. This thinking is charted initially through the environmental responses to a large historical earthquake in Peru. Immediate responses to an earthquake can be a tsunami (what we are looking for) and landslides, followed later by new coastal dunes forming, and later still, vast quantities of sediment accumulating in rivers. All of these responses can be dated—radiocarbon dating and other dating techniques are discussed. After a detailed discussion on southwestern New Zealand the vagaries of these environmental responses are discussed from two entirely different environments, eastern New Zealand and eastern Japan.
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