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As local earthquakes don’t produce very low frequencies, the use of expensive broadband seismometers, for local and regional seismicity monitoring, maybe avoided. Low frequency geophones have been used in the past for this type of monitoring, however, their response is typically very limited below 2Hz, and thus a magnitude overestimation may occur. In most cases, wide band seismic sensors are typically used in local and regional seismicity monitoring experiments, but it is not always clear what are the achievable measurement quality levels and how they compare to solutions that are more expensive.
This work tries to shed light into this problem, by presenting a comparative study among three widely available sensors, representing the state of the art in the market of both wideband and broadband sensors. Two different earthquake experiments have been used, with magnitudes ML 4.9 and 4.7 and epicenter distances of 200 km and 100 km, respectively. For each experiment, the wave form and spectrum plots of each vertical channel have been analyzed.