Table 2 Qualitative comparison of the influences of various factors on generation of anomalies 1, 2, and 3
Factor | Effect | Level of influence | ||
|---|---|---|---|---|
Anomaly 1 | Anomaly 2 | Anomaly 3 | ||
Distance | Geometric spreading attenuation | Weak | Weak | Weak |
Source mechanism | Large amplitudes in lobes of radiation pattern | Medium | Weak | Strong |
Surface waves | Surface waves generated for shallow subsources | Weak | Weak | Weak |
Seismic potency | Increase or decrease amplitudes, respectively, for shallow and deep subsources | Medium | Medium | Weak |
Seismic impedance | Decrease or increase amplitudes, respectively, for shallow and deep subsources | Medium | Medium | Weak |
Basin sediments | Generation of basin waves | Medium | Strong | Weak |
Accretionary prism | Generation of surface waves | Weak | Weak | Medium |
Reflection from Conrad discontinuity | Increase or decrease amplitudes for subsources, respectively, above or below Conrad discontinuity | Strong | Strong | Weak |