Chocolate, cuckoo clocks...& quakes? Switzerland may not be widely known for earthquakes, but they do happen, for example the 9 December 1755 Valais earthquake. The Swiss Seismological Service keeps a close eye on past & present quakes:
Seismographs and later seismometers have been recording earthquake data since the end of the 19th century. The collected data enable quakes to be pinpointed and assigned a magnitude. However, only data obtained since the installation of a network of modern measuring devices in Switzerland in the 1970s can be deemed reliable.
Researchers interested in the consequences of older events have to rely on historical accounts from previous centuries. These accounts are evaluated and attributed a value along the with a view to estimating earthquake parameters with the help of statistical procedures. All reports that are examined are subjected to a critical historical analysis so as to arrive at the best possible interpretation or reconstruction of events.
'Natural archives' provide valuable information for periods stretching even further back in time. Examples of such natural archives are lake-bed sediments that document soil slippage resulting from earthquakes, broken stalactites and stalagmites in caves and archaeological findings. However, these paleo-seismological methods are not entirely reliable., is the first historically qualified catalogue of earthquakes in Switzerland available online. It covers the period extending from 250 A.
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