Japan issued a megaquake advisory Tuesday after a magnitude 7.5 earthquake struck the northern part of the country, causing 34 mostly mild injuries and some damage to roads and buildings. The government has estimated that an offshore megaquake could cause a tsunami of up to 98 feet and kill nearly 200,000 people.

Officials said the advisory is not a prediction and the probability of a magnitude 8 or larger quake is only about 1%. But there's hope the advisory will serve as a wake-up call for a quake that could have the devastation of the 2011 disaster that killed nearly 20,000 people and destroyed a nuclear plant.

There's said to be an increased risk of a subsequent, magnitude 8 or larger quake within the next week. Officials are urging residents, especially along coastal areas,

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