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Add introduction to seismogram #9

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2 changes: 1 addition & 1 deletion source/index.rst
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:hidden:

introduction/index
seismic-data/index
seismogram/index


.. toctree::
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4 changes: 0 additions & 4 deletions source/seismic-data/index.rst

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9 changes: 9 additions & 0 deletions source/seismogram/index.rst
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地震图
======

地震图 (seismogram) 是指地震仪记录到的带有记时信息的地面质点运动(位移、速度、加速度、转动等),
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也称为地震波形 (seismic waveform)。其一般有三个正交分量,如南北、东西和垂直分量,
因此地震图的本质是三维时间序列。
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地震图与元数据 (metadata) 共同构成了完备的地震学观测数据。元数据包含与地震图相关的重要信息,
如台站位置、仪器响应、震源位置、震源机制等。
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