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| | Abstract | | In recent years, a problem has risen that rescue operation from earthquake damage is interrupted by unpredictable aftershock. In order to relieve this, there have been instruments that warn scue personnel of the reach of an aftershock by decting preliminary tremor, which arrives prior to destructive S-wave. Although it has already been fairly common to see such instruments in the market, we developed the one, which focused on reasonable price and easy operation. |
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