Japan Tourism Agency provides emergency information to foreign tourists visiting Japan on the following site.
safety tips for travelers(English version only):
More than 105,000 people were left dead or missing by the 1923 Great Kanto earthquake.
About 90% of the victims burned to death. In Tokyo City at that time, the coincidence of 134 fires produced a large firestorm, and a produced gigantic fire whirl killed 38,000 people who evacuated to the site of a former army garment factory. In contrast, 20,000 people who evacuated to the Fukagawa Villa of the Iwasaki family were safe. The villa became open to local people as an evacuation spot after the quake. The factory site was a vacant lot, but the villa had many trees, shrubs, and a pond. More than 40% of the city's total land area was burned.
Yamashita Park in Yokohama was made in 1930 out of reclaimed land made from the rubble caused by the Great Kanto Earthquake in 1923. In this August, boring survey was conducted at the park in order to investigate the circumstances at the time. Discovered debris including broken pieces of roof tiles, bricks, bowls will be opened to the public at Yokohama Port Museum next to Sail Training Ship Nippon Maru from September 28 to November 17.
Annual comprehensive disaster prevention drills were held on September 1. The prime minister took part in the drills together with all Cabinet members. Although 1,330,000 people in 43 prefectures were scheduled to participate in the drills, they were cancelled due to torrential rains in Kyushu and Shikoku.
The drills had countermeasures for the Nankai Trough Earthquakes(the Nankai megathrust earthquakes). Japan has 60-70% chance of a magnitude 8-9 earthquake along the Nankai Trough which extends about 770 km from Suruga Bay off Shizuoka Prefecture to areas off eastern Kyushu. The trough have caused magnitude 8 earthquakes regularly with an interval of 100 to 200 years. It is estimated that some of these earthquakes were caused by the movement of several faults at the same time. It's been estimated that if some groups of the hypocentral region move at the same time, a megaquake will result in 230,000 deaths from tsunami, 82,000 from building collapse, 10,000 from fire.
Long-period earthquake ground motion is also a big problem. Buildings on the soft ground entered into resonance with an long-period earthquake. The 2011 Tohoku earthquake damaged a building in Osaka far away from Tohoku. High-rise buildings tend to shake on the soft ground, and low-rise buildings tend to shake on the firm ground. Upper floors of high-rise buildings shake badly.
Although we have made repeated attempts to minimize earthquake damage, earthquakes often exceed all expectations and baffle our calculations. Every damage from the past earthquakes raised new problems.
Seismic hazard assessment became valued more than earthquake prediction after the 2011 Tohoku earthquake in Japan.
Postseismic deformation of the 2011 Tohoku earthquake have influenced volcanos and active faults in other areas. Global positioning system (GPS) equipment can detect sub-centimetre changes in land movements. Experts have scoured past earthquake data. Geologists have analyzed tsunami sediments discovered in strata and the remains.