Fig. 3
From: Detection of repeating earthquakes and their application in characterizing slow fault slip
a Frequency and magnitude ranges suitable for repeater detection from waveform similarity based on considerations of source size and b ranges used in previous studies. Black and gray lines respectively show the corner frequency and the condition where the resolution is equal to the fault radius for a 10 MPa stress drop. Dashed black and gray lines are the same but for a 1 MPa stress drop. Frequencies larger than the corner frequency (blue area) are considered to be inappropriate because the rupture process, including the initiation point and propagation may affect waveforms’ shape. Having the resolution lower than the fault radius (radius ≤ vs/4f) (red area) is also inappropriate because non-overlapping events can also have similar waveforms. In b, frequency and magnitude ranges are plotted for the studies listed in Table 1. Note that only the first author and publication year are shown for each study and some studies used not only waveform similarity but also hypocenter location or other conditions to confirm repeaters. When the maximum size of detected earthquakes is not reported, the upper bounds of magnitude are not shown