The main factor is the earthquake's size, but then there is also the earthquake depth.

主要因素是地震的大小，但地震深度也是因素之一。

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We issue a warning after a big earthquake, and we can predict what the tsunami arrival times should be because tsunami speed is directly controlled by the depth of the water through which it travels.

我们一般在大地震发生之后发布海啸预警，并预测海啸的抵达时间，因为海啸速度是由它所经过的水域深度直接决定的。

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Making matters worse, the earthquake was relatively shallow, at a depth of five miles, the U.S. Geological Survey said.

更糟糕的是，据美国地质调查局说，这是一次相对浅层的地震，震中距地面仅五英里。

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"The main factor is the earthquake's size," "But then there is also the earthquake depth.

VOA: standard.2010.01.13

That earthquake's depth was 6.4 km (4 miles).

CNN: At least 150 killed in Italian earthquake, officials say

The magnitude of the earthquake and its shallow depth -- 15.2 miles (24.5 kilometers) -- created a lot of energy, said Shenza Chen of the U.S. Geological Survey.

CNN: Widespread destruction from Japan earthquake, tsunamis

Many injured residents were sent to the nearby provincial capital of Chengdu, which sustained damage in a stronger 2008 earthquake that killed more than 80, 000 people and revealed the depth of the region's substandard building quality and emergency response efforts.

WSJ: China Rushes to Show Quick Reaction to Quakes