The Mechanism of the Deep-Focus, Sea of Okhotsk Earthquake of May 24, 2013 as Inferred from Static Displacements and Broadband Seismograms

The seismic moment tensor (SMT) was computed for the source of the deep-focus Sea of Okhotsk earthquake of May 24, 2013 (M-w = 8.3) based on two kinds of regional data: (1) coseismic displacements at GNNS stations; and (2) three-component broadband seismograms (in this case we also estimated the depth of the equivalent point source and rupture duration along with the SMT). These computations were done independently for each of the two data sets. In the first of these cases we computed the SMT using simulated static displacements due to elementary dipoles as based on the ak135 spherical earth model. In the second case we used synthetic broadband seismograms as computed for a layered, elastic, isotropic, half-space model. Both of the two inversions were carried out by original methods for calculating the simulated data. The SMT determinations that are based on the two data sets are consistent with each other and with determinations from other publications.