自然地震観測におけるMEMS型加速度センサーの特性評価(<特集>首都直下地震防災・減災特別プロジェクトPart 2)

概要

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Technology for imaging the lithospheric structure using earthquakes, such as receiver functions and seismic interferometry, have advanced greatly in the last decade. Three component, low cost accelerometer sensors have been constructed using Micro Electro Mechanical System (MEMS) technology, and are providing new opportunities for earthquake observations. To evaluate the feasibility of MEMS sensors for earthquake observations, dense seismic array observations were carried out using MEMS sensors in Mizusawa district, northern Honshu, Japan, for three months in 2007. In comparison with observed seismograms of velocity sensors, MEMS sensors show high performance for local and regional earthquakes. However, due to high-noise levels from the sensor itself at lower frequencies, MEMS sensors are not adequate for recording teleseismic waves.
2010-02-26