结果表明：绝大部分中强以上地震前2 ~3年，在未来震中周围出现较大范围的A值中期异常区域，有很好的预报效果。

The result shows that there are obviously anomaly zones of a value with better prediction ability, in mid term of 2 ~ 3 years before most moderately strong earthquakes.

youdao

结果表明，中强地震前1 ~3年未来震中周围通常出现明显的W1值中期异常区，该方法具有较好的中期预报效果。

The result shows that the mid-term anomaly zone of W1-value usually appears obviously around the epicenter about 1-3 years before future earthquakes with good prediction effect.

youdao

结果表明，中强地震前1 ~3年未来震中周围通常出现明显的W1值中期异常区，该方法具有较好的中期预报效果。

The result shows that the mid-term anomaly zone of W1-value usually appears obviously around the epicenter about 1-3 years before future earthquakes with good prediction effect.

youdao