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Table 2 Nominal parameters for the broadband seismometer used in this study (Trillium Compact 120S)

From: Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source model

Parameter Nominal values Units
Poles (p1-p7) −0.03691 ± 0.03712i, −371.2, −373.9 ± 475.5i, −588.4 ± 1508i rad/s
Zeros (z3) 0,0,–434.1 rad/s
Normalization factor κ 8.18 × 1011 (rad/s)4