Study of a number of small seismic swarms also gives us the preliminary understanding that the attenuation rate of seismic coda waves of swarms does not change considerably.

而对一些小震群的研究得到震群地震尾波率衰减变化不大的初浅印象。

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Preliminary reports ruled out that seismic sound waves created by oil exploration in that stretch of sea could have killed the birds, the environment ministry said.

CNN: Peru investigates mystery pelican deaths