Don Helmberger Zhongwen Zhan Robert Graves Shengji Wei 2013 <p><span>We derive a finite slip model for the 2013&nbsp;</span><i>M_w</i><span><span>&nbsp;</span>8.3 Sea of Okhotsk Earthquake (</span><i>Z</i><span> = 610 km) by inverting calibrated teleseismic<span>&nbsp;</span></span><i>P</i><span><span>&nbsp;</span>waveforms. The inversion shows that the earthquake ruptured on a 10° dipping rectangular fault zone (140 km × 50 km) and evolved into a sequence of four large sub-events (E1–E4) with an average rupture speed of 4.0 km/s. The rupture process can be divided into two main stages. The first propagated south, rupturing sub-events E1, E2, and E4. The second stage (E3) originated near E2 with a delay of 12 s and ruptured northward, filling the slip gap between E1 and E2. This kinematic process produces an overall slip pattern similar to that observed in shallow swarms, except it occurs over a compressed time span of about 30 s and without many aftershocks, suggesting that sub-event triggering for deep events is significantly more efficient than for shallow events.</span></p> application/pdf 10.1002/grl.50977 en American Geophysical Union Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes? article