Table 6. Full Moment Tensors From Seismology and InSARa


Source	Mrr (1018 Nm)	Mtt (1018 Nm)	Mpp (1018 Nm)	Mrt (1018 Nm)	Mrp (1018 Nm)	Mtp (1018 Nm)	M0 (1018 Nm)	DC (%)

Darfield 3rd September 2010
InSAR	6.42	-2.41	-4.00	7.76	-1.72	-35.7	52	79
GCMT	3.85	0.08	-3.92	4.91	0.10	-36.0	36	85
USGS	5.8	-0.7	-5.1	8.0	4.6	-33.4	35	68
GeoNet	17.2	-9.24	-7.93	36.2	35.8	-41.3	61	19

Christchurch 22nd February 2011
InSAR	2.67	0.409	-3.07	1.234	0.695	-1.68	4.1	69
GCMT	1.09	0.602	-1.70	0.315	-0.269	-1.20	1.9	43
USGS	1.11	0.58	-1.69	0.20	-0.40	-1.23	1.9	37
GeoNet	1.41	0.44	-1.85	1.15	0.44	-1.37	2.5	71

aThe six components of the moment tensor (Mrr, Mtt, Mpp, Mrt, Mrp, Mtp) and the total moment M0 are given. The InSAR moment tensor is calculated from summing the uniform slip segments in Tables 3 and 4. We calculate the percentage double-couple component DC of the InSAR and seismological solutions following a definition given by Jackson et al. [2002], where a pure double couple source (with eigenvalues lambda of -1, 0, 1) is 100% and a compensated linear vector dipole (e.g., lambda -1/2, -1/2, 1) is 0%. DC = 100 - {1 - [(2|lambda2| x 1.5)/(|lambda1| + |lambda3|)]}.