“…(b) Combined 6-8 Hz Pn/Lg, PR/Lg and 1-2/64 Hz Lg coda ratio averaged for MNV-KNB (Walter et al, 1995). (c) Regional n/l, versus m/7(P,l) (Patton and Walter, 1993 (GoIdstein, 1995). Note shaIlow earthquakes (filled squares) are a problem for (a) and (b) but not (c) and (d), while collapses are a problem for (c) but not (a) and (d).…”