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As you can see, the past week has seen a large amount of seismic activity within the Tokyo/Chiba area... And this is only a small sample size, as we've also had 20+ smaller earthquakes within the M3-M4 range!
Aside from being annoying (especially the early morning shakes), there is also genuine concern that more earthquakes, with even stronger ones, being a possibility in the very near foreseeable future......
More information on the phenomenon can be found here Japan warns of more strong quakes as 'slow slip' phenomena hits Chiba
The Kanto/Tokyo region is well overdue it's next strong earthquake, and hopefully this isn't a precursor to the inevitable... But, there is no point with worrying about that. Just have to get on with our daily lives and be prepared for the 'next big one'. Our home is well stocked with emergency supplies and our whole family knows what to do in the event of a strong earthquake.A series of earthquakes that has rattled the eastern coast of Chiba Prefecture and surrounding areas over the past week — believed to be part of a phenomenon known as a “slow slip” in tectonic plates — have prompted a government panel to warn of more “strong tremors” in the coming days.
Three earthquakes measuring a shindo 4 on the Japanese seismic intensity scale, as well as four measuring a shindo 3, have occurred since Thursday, including a magnitude 5.2 quake on Friday.
These quakes are believed to have been caused by a slow slip between the Philippine Sea plate and the continental plate off the Chiba coast, based on satellite data from Japan’s Geospatial Information Authority.
While a regular earthquake is a quick slip, a slow one can cause little shaking on the surface. Slow slips occur when strains build up to the limits just as with ordinary earthquakes but the slides are slow due to fault properties, with a repeated cycle of locking and slow slipping.
Similar seismic activity has been observed at various intervals in recent years — including in 1996, 2002, 2007, 2011, 2014 and 2018 — with the activity lasting anywhere from a week to several months.