Thanks. Took me a minute to realize your search ended just before the M9. I changed the search to look at M5+ to present, and except for a linear trend east of Tokyo, there have been few M5+ quakes in the last 12 or 13 years in the Tokyo/Tokyo bay area. So, having three of them in a month is a bit unusual, but as always, no idea what it means.

OK, you reminded me that it is easy to search, so maybe next time I will do it.

Chris