Me and my family are expats currently living in Japan where earthquakes are very frequent. It is expected that a big quake is due and it may happen anytime. Recent big occurence was in 2011 and it was followed by a tsunami. But the main impact happened to the communication during such crisis as everybody uses the network and it gets totally jammed or due to the quake the supporting equipment and network was damaged.
Whatever the reason for blackout, i would like to know if there is a 'handy' communication device available in open market that can be used when the next quake strikes, for communicating with my family without any disruption due to the quake.
Since Amateur/HAM people are usually deployed for linking areas which out of reach during times like mentioned above, please suggest any two way communication device pair (sort of walkie-talkie types i imagine) which can be kept with myself at all times and the other with my family. They should be able to communicate in a metropolitan like Tokyo and should have coverage of atleast 30-50 kms radius.
Thanks in advance!