Scientists record these waves on a device called a seismograph.

科学家用地震仪这个记录地震波。

Deep-sea seismographs have recorded explosions on the ocean floor.

深海 地震仪 记录了 爆炸 在 海洋 底部。

To avoid this, NASA scientists plan to place 10 more seismographs on the lunar surface in order to find the calmest areas where tremors are least likely.

为了免这种情况，美国宇航局的科学家计划在月球表面再放10个地震仪，以便找静的地区，那里不可能发生地震。

Then the compression itself is accompanied by very powerful shocks such as those that seismographs recorded, therefore, approximately 25% of moon quakes as a result of cooling of the lunar subsurface.

然后，这种压缩本身就伴随着非常强烈的震动，比如地震仪记录的那些震动，因此，大约25%的月球地震是由于月球地下表面冷却造成的。