Geophones with resonant frequencies of 1–4 Hz are commonly used as short-period sensors for site-response studies (e.g., Bonilla et al., 1997; Hartzell et al., 1997; Frankel et al., 1999; Hartzell et al., 2000) and crustal-reflection, refraction, and tomography experiments (e.g., Brocher et al., 2001; Fuis et al., 2003). In many cases these studies require only arrival-time picks, but site-response and attenuation measurements require accurate ground-velocity data from these sensors. Moreover, these geophones are often used to record seismic phases at or below their nominal...

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