The USGS is not the only group exploring the problem.

美国地质调查局并不是唯一探索这个问题的机构。

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To start, you need to get the USGS "legacy" data imported into your database.

首先，需要将 USGS “遗留” 数据导入到数据库。

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The first earthquake happened at 2:28 p.m. local time (2:28 a.m. ET), the USGS said.

美国地质局称第一次地震发生在当地时间下午2：28分。

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At least three strong aftershocks struck the same area later Tuesday, the USGS said.

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The USGS originally gave the magnitude as 7.3 but later corrected it to 7.2.

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The USGS recently decided to retire its Landsat 5 satellite after nearly 30 years in service.

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