Gravitational field sensor for prediction of big seismic waves

The authors outline the gravitational field sensor for prediction of large seismic waves. They studied the turbulence of a Newtonian gravitational field due to large seismic waves and the detection of the turbulent field by an interferometric gravitational wave antenna. The cause of the turbulent field is the variation of the mass density in the ground by the waves. The warning system using the antenna is superior to that of a seismograph. When the seismograph and the antenna are set at the same place, for instance, 100 km away from the epicenter of a strong earthquake of M_S~7, the seismograph does not respond until the arrival of the P-wave, but the antenna will respond to the gravitational field with about a 20-dB sensitivity 7 s before the arrival