Table 2 Main frequency and its amplitude abnormal fluctuation modes prior to the emergence of accelerated creep for sandy HBS.
From: Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment
Main frequency | Main frequency amplitude | |||
|---|---|---|---|---|
P-wave | S-wave | P-wave | S-wave | |
Sh = 30%, Pc = 1.0 MPa | NA | NA | Plummet | Plummet |
Sh = 30%, Pc = 2.0 MPa | NA | Sharp increase | Plummet | / |
Sh = 30%, Pc = 3.0 MPa | Plummet | Plummet | / | / |
Sh = 20%, Pc = 1.0 MPa | NA | NA | Plummet | NA |
Sh = 40%, Pc = 1.0 MPa | Sharp increase | NA | / | NA |
