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Table 2 Qualitative comparison of the influences of various factors on generation of anomalies 1, 2, and 3

From: Visualization of Green’s function anomalies for megathrust source in Nankai Trough by reciprocity method

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