根据美国地质勘探局(usgs)的数据，相对于北美版块，此次地震发生地的太平洋板块向西北移动，大约每年向北(at the latitude)移动45毫米。

According to the U.S. Geological Survey (USGS), the Pacific plate moves northwest with respect to the north America plate at about 45 millimeters per year at the latitude where the quake occurred.

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