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0Depth (kms)0 10Distance (kms)A A’Mag 2Mag 3Mag 4Mag 5Mag 6104 5 6km/s▲▲Figure 4. Aftershock locations for events between 1 February and 31 March 2011, projected onto the vertical plane AA’ of Figure3; only events within 2 km of the vertical plane are shown. The February M w 6.2 earthquake is at ~X = 8 km. The solid line shows theprojection of the fault plane 1 inferred from geodetic studies (Beavan et al. 2011, page 789 of this issue). Color background shows theP-wave velocity.0Distance (kms)0 10 20B B’Mag 2Depth (kms)Mag 3Mag 4Mag 5Mag 6104 5 6km/s▲ ▲ Figure 5. Aftershock locations for events between 1 February and 30 April 2011, projected onto the cross-section BB ’ of Figure 3—avertical plane with strike N79.5E degrees; the fault plane 2 of Beavan 2011, page 789 of this issue. Only events within 1.2 km of theplane are shown. Background colors show P-wave velocity; areas that have lower ray path coverage (derivative-weighted-sum lessthan 50) are grayed out. The February M w 6.2 earthquake is at ~X = 12 km. Earthquake symbol sizes are as for Figure 4.844 Seismological Research Letters Volume 82, Number 6 November/December 2011