  Effects invoked by the passage of the cosmic string through the Earth are
investigated. The cosmic string induces global oscillations of the Earth whose
amplitude and acceleration both linearly depend on the string line density. For
the line density maximally allowed by the cosmic observations, the oscillations
are perceivable even to human beings and may cause serious damages to the
environment. Use of the sophisticated accelerograph enables us to detect the
string of a line density down to ten orders of magnitude smaller than the
cosmologically relevant value.
