![]() ![]() " Then we have examined for all earthquakes from magnitude six or higher, whether there were foreshocks in this area within 60 days." The result: 16 percent of the main shocks were preceded by such foreshocks within 60 days whereas only 7 percent (three percent) of the main shocks were preceded by foreshocks within one day (one hour). " We have assumed that such vibrations are felt at a distance of 100 kilometers for animals," says Woith. They used data from an earthquake catalog (ISC-GEM), which records worldwide earthquakes of magnitude M 5.6 and higher in the years 2000-2012. The reports come from two dozen countries, most of them from New Zealand, Japan, Italy and Taiwan.Īmong other things, Woith's team has investigated the effect of foreshocks: noticeable vibrations, which occur on every tenth earthquake days or even weeks before. The analysis included more than 700 records of claimed animal precursors related to 160 earthquakes with unusual behavior of more than 130 species - from sheep to goats to snakes and fish. ![]() " We have looked more closely at such studies and investigated whether there is a statistical correlation between seismic activity and animal behavior." This first comprehensive statistical analysis is published in the journal Bulletin of the Seismological Society of America. " The reports of conspicuous behavior are numerous, but it could have other causes," says Heiko Woith. Scientists at the GFZ German Research Center for Geosciences in Potsdam had a closer look at the available data. So how should ordinary domestic and wild animals be in a position to do so? Moreover: The exact time of such an event depends on many different factors and can probably never be accurately predicted according to the current state of science. ![]() On the other hand, there are many earthquakes before which such abnormal animal behavior has precisely not been observed. On the one hand there are numerous reports of chickens, sheep or dogs that behaved strangely before a quake.
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