Earthquake monitoring using fiber laser borehole seismometer

摘要

In this paper we report the earthquake monitoring using a fiber laser borehole seismometer. A fiber laser based accelerometer is used in the seismometer to detect the earthquake induced acceleration. Due to the ultra-narrow line width of the fiber laser (up to several kHz), an equivalent noise level of 50 ng can be achieved when using a fiber optic interferometric method. The fiber laser borehole seismometer is installed in a 400 m depth hole in Yunnan Province. A micro-earthquake (M=1.2) in Puer area is detected.