A Low Cost Accelerometer Network for Generation of Shake Maps

Abstract eng:
A small scale and affordable local Strong Motion (SM) network of three MEMS based sensors is set up in Tekirdağ region in Turkey in 2015. The recorded raw data is transmitted to a central server over Internet via 3G modem. Through customized Matlab software, the SM network is fully capable of calculating the selected SM parameters on a central sever in real-time. The calculated SM parameters are then compared to predefined thresholds, and a central voting system installed on the server detects earthquakes in the vicinity of the local SM network. The functionality of the network has been tested and validated using several shake table tests. Since the installation of the Tekirdağ SM network, several small scale earthquakes have been recorded. Although the ultimate expectation of this deployment is to capture moderate to large magnitude events, small event recordings have also been very useful to find out the performance of the software developed, as well as the hardware at free field conditions. Real time features of the network and the software has been tested successfully during small earthquakes. The results also showed that instrument self-noise is low enough to record large magnitude events but, the high frequency component of the ground motions is underestimated due to the sensitivity of the sensor used. The SM network can be used efficiently to record moderate to strong earthquakes in near field in order to create rapid shake maps, providing that the sensor is replaced with an upper quality ensembles.

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