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The 3 axes micro-seismometer developed by JPL is composed of 3 small-size sensors (25 mm, H 10 mm X 3).
schematic diagram of the microsensor JPL design
The bandwidth of this instrument (0.1 Hz - 100 Hz) and its sensitivity (10-9 m.s-2/ Hz-1/2) dedicate it to the high frequency domain, where the signals have large amplitude in ground acceleration, between the source corner frequency (typically 1Hz to 10-20 Hz for the expected marsquake magnitudes) and the corner frequency associated with the planet attenuation (between 0.2 and 10 Hz) according to the phases and the epicentral distances. One of the axes will partially fill in the lack of the third VBB axis (in the range of volume waves (0.1Hz-10Hz)). It will thus make possible to locate sources thanks to the volume waves polarization in this frequency band.