Research And Achievement On Earthquake Intensity Monitoring Technology Based On MEMS Accelerometer

When an earthquake happens, fast acquisition and release of earthquake intensityinformation has guiding significance in earthquake relief. MEMS accelerometer hasthe advantage of low cost and is easy to deploy. Earthquake intensity monitoringincludes data acquisition and preprocessing, seismic event detection, eventcharacterization and issuing of messages. This paper is based on the seismic intensitymonitoring technique of seismic data collected by MEMS accelerometer, and themain contents are as follows: data preprocessing of original acceleration signal,including band-pass filtering and acceleration-speed convertion, seismic eventdetection, event characterization and issuing of messages, the comparative research onMEMS and traditional seismic accelerometer.This paper shows that, IIR Butterworth bandpass filter can be used for bandpassfiltering of seismic signal, and can optimize the results of P-wave event detection; thedifference between using low order and high order filters is little. Kanamori q=0.9algorithm can be used to convert acceleration data into speed and displacement data;the acceleration-converted speed data can optimize P-wave event detection effect. Theslope of SNR sequence used into STA/LTA algorithm can be applied to S-wavedetection. The seismic predominant period of earthquake has certain effect on ruptureprocess, but should not be the basis of magnitude calculation. Using a MEMSaccelerometer to monitor strong quake has the similar effect with using a traditionalone, showing MEMS accelerometers can be well applied to strong earthquakemonitoring.This study is an organic part of low cost earthquake monitoring terminal, whichcan be applied to seismic intensity reporting system.