Detection of low-frequency earthquakes by the matched filter technique using the product of mutual information and correlation coefficient

Earth, Planets and Space

Table 1 Detection results by visual inspection

Number of events (not removed by amplitude ratio)	Summed CC > 5.0	N.SUKH MICC > 0.35
DLF earthquake	297 (295)	314 (309)
Surface wave	12 (10)	28 (9)
Noise	2 (1)	8 (6)
Regular earthquake, shallow tremor, etc	1 (1)	4 (4)
Total	312 (307)	354 (328)

^*Numbers in brackets are the total numbers of detected events after removing the surface-wave misdetections (i.e., the amplitude ratio between the 0- to 10-s and 10- to 20-s intervals after the detection onset is larger than one)