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How Well Can We Extract the Permanent Displacement from Low-Cost MEMS Accelerometers?
Sensors 2017 November 17
Following the recent establishment of a high-density seismic network equipped with low-cost micro-electro-mechanical system (MEMS) P -wave-alert-device ( P -Alert) by the earthquake early warning (EEW) research group at the National Taiwan University, a large quantity of strong-motion records from moderate-magnitude earthquakes (ML > 6) around Taiwan has been accumulated. Using a data preprocessing scheme to recover the dynamic average embedded within the P -Alert data, we adopted an automatic baseline correction approach for the P -Alert accelerograms to determine the coseismic deformation (Cd). Comparisons between the Cd values determined using global positioning system (GPS) data, strong-motion records from the P -Alert network, and data from the Taiwan Strong Motion Instrumentation Program (TSMIP) demonstrates that the near-real-time determination of Cd values (>2 cm), which provide crucial information for seismic hazard mitigation, is possible using records from low-cost MEMS accelerometers.
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