The Geodetic and Seismic Sensor Module (GSSM) collects time-series of calibrated pressure that can be used to measure secular vertical strain and detect slow slip events. 

PN1B

COSZO instrument (coming in 2026) - GSSM (Wilcock et al., 2021); Sample rates: up to 180 Hz

PN1C (Offshore)

COSZO instrument (coming in 2026) - GSSM (Wilcock et al., 2021); Sample rates: up to 180 Hz

PN1D

COSZO instrument (coming in 2026) - GSSM (Wilcock et al., 2021); Sample rates: up to 180 Hz