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GPS stations detect crustal deformation caused by the Iwate-Miyagi Nairiku Earthquake in 2008

1. Crustal deformation detected by the GPS-based control station

At most ~2.1m uplift and ~1.5m horizontal displacement are observed at KURIKOMA2 GPS station (Figure 1-1, 1-2 and 4). This displacement is the largest one ever observed by the GPS-based control stations in Japan.

2. Earthquake fault model

The simulated fault model (Figure 2 and 3) shows the earthquake fault plane inclines to the west. The size of the reverse fault is 20km length by 12km width. The depth of the upper side is 0.4km and the slip is 3.5m along the fault plane. The moment magnitude (Mw) is estimated to be 6.9.

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