Title :
Sensor for gravitational field and its application to measures against large earthquake disasters
Author_Institution :
Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan
Abstract :
A gravitational field sensor is described as well as its application to provide warnings so that measures can be taken to mitigate the effects large earthquakes. One of the most promising sensors uses the principle of Michelson interferometry. Assuming a great earthquake (magnitude M=7) where the epicentral distance to a city is long, for instance, ~100 km the sensor will respond to the turbulent gravitational field with about 20 dB sensitivity 7 seconds before the seismic wave (primary wave) arrival. Even in a short period such as this it will be possible to take some safety measures like turning off the gas and nuclear reactors, bringing trains to a sudden stop, etc
Keywords :
disasters; earthquakes; emergency services; geodesy; geophysical techniques; gravimeters; light interferometry; seismology; Michelson interferometry; disaster prevention; geophysical measurement technique; gravimeter; gravitational field sensor; great earthquake; large earthquake disaster; mitigate; nuclear reactor; safety measure; seismology; train; very short term prediction; warning; Geodesy; Geophysical measurements; Gravity measurement; Optical interferometry; Seismology;
Conference_Titel :
Security Technology, 1994. Proceedings. Institute of Electrical and Electronics Engineers 28th Annual 1994 International Carnahan Conference on
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-1479-4
DOI :
10.1109/CCST.1994.363779
