Accelerometers calibration by primary and secondary means is now very well covered both in low and medium frequency range. This is obviously not the case for seismometers which are though widely used all over the world. Up to now, seismometers only have internal checks thanks to an integrated coil. Calibration of these devices address different challenges like large masses and volumes, non-rotatable three-axes devices, specific mounting. This interlaboratory comparison will help to investigate

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... hese fields and to give feedback do develop a methodology to calibrate seismometers.