虽然有些路要拐着走，半个小时， 从跑出来，启动，跑出5公里，是比较可能的吧
http://en.wikipedia.org/wiki/2011_Sendai_earthquake_and_tsunami#Japan
The 2011 Sendai earthquake and tsunami (東北地方太平洋沖地震 Tōhoku Chihō Taiheiyō-oki Jishin[7], literally "Tōhoku region Pacific Ocean offshore earthquake"[FN 1]) was a 9.0 MW megathrust earthquake off the coast of Japan that occurred at 14:46 JST (05:46 UTC) on Friday 11 March 2011.[2][4][8] The epicenter was reported to be 130 kilometers (81 mi) off the east coast of the Oshika Peninsula, Tōhoku, with the hypocenter at a depth of 32 km (20 mi).[9][10]
One minute prior to the effects of the earthquake being felt in Tokyo, the Earthquake Early Warning system connected to more than 1,000 seismometers in Japan sent out warnings on television of an impending earthquake to millions. This was possible because the damaging seismic S-waves, traveling at 4 kilometers per second, took about 90 seconds to travel the 373 km (232 mi) to Tokyo. The early warning is believed by the Japan Meteorological Agency to have saved many lives.[29][30]
The earthquake triggered tsunami warnings and evacuations along Japan's Pacific coast and in at least 20 countries, including the entire Pacific coast of North America and South America.[11][12][13]
The tsunami warning issued by the Japan Meteorological Agency was the most serious on its warning scale ("Major tsunami", ie. at least 3 m (9.8 ft) high).[50] The actual height predicted varied, the greatest being for Miyagi at 10 m (33 ft) high.[51] The earthquake took place at 14:46 JST around 70 km (43 mi) from the nearest point on Japan's coastline (to the west), and initial estimates indicated the tsunami would have taken 10 to 30 minutes to reach the areas first affected, and then areas further north and south based on the geography of the coastline.[52][53] Just over an hour after the earthquake, a tsunami was observed at 15:55 JST flooding Sendai Airport, which is located near the coast of Miyagi Prefecture,[54][55] with waves sweeping away cars and planes and flooding various buildings as they traveled inland.[16][56] The impact of the tsunami in and around Sendai Airport was filmed by an NHK News helicopter, showing a number of vehicles on local roads trying to escape the approaching wave and being engulfed by it.[57] A 4-meter (13 ft)-high tsunami hit Iwate Prefecture.[58]
On 13 March 2011, the Japan Meteorological Agency (JMA) published details of tsunami observations recorded around the coastline of Japan following the earthquake. These observations included tsunami maximum readings of over 3 meters (9.8 ft) at the following locations and times on 11 March 2011, following the earthquake at 14:46 JST:[70]
- 15:12 JST – Iwate Kamaishi-oki – 6.8 m (22 ft)
- 15:15 JST – Ofunato – 3.2 m (10 ft) or more
- 15:20 JST – Ishinomaki-shi Ayukawa – 3.3 m (11 ft) or more
- 15:21 JST – Miyako – 4.0 m (13.1 ft) or more
- 15:21 JST – Kamaishi – 4.1 m (13 ft) or more
- 15:44 JST – Erimo-cho Shoya – 3.5 m (11 ft)
- 15:50 JST – Soma – 7.3 m (24 ft)
- 16:52 JST – Oarai – 4.2 m (14 ft)
