As I'm a newbie in seismology and related area, I would like to know which type of seismic sensors usually used in earthquake early warning systems?
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4$\begingroup$ Welcome! I recommend starting with some reading about early warning systems for earthquakes. Then you can ask a more pointed question, as this one is rather open-ended. $\endgroup$ – kwinkunks Mar 6 '18 at 16:41
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Accelerometers, preferably triaxial (i.e., those that record horizontal and vertical motion). Beyond that your question is indeed a bit too open-ended. Some use many cheap MEMS (http://onlinelibrary.wiley.com/doi/10.1029/2008GL036572/epdf; https://www.theverge.com/circuitbreaker/2017/7/13/15963996/raspberry-pi-seismograph-early-warning-earthquakes; these are similar to those found in phones), some use more expensive but reliable equipment (https://kinemetrics.com/post_products/episensor-es-t/)...
