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Rupture complexity of the M w 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes?
Author(s) -
Wei Shengji,
Helmberger Don,
Zhan Zhongwen,
Graves Robert
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50977
Subject(s) - seismology , geology , aftershock , slip (aerodynamics) , inversion (geology) , fault plane , seismic gap , earthquake rupture , waveform , fault (geology) , geodesy , tectonics , physics , thermodynamics , quantum mechanics , voltage
We derive a finite slip model for the 2013 M w 8.3 Sea of Okhotsk Earthquake ( Z = 610 km) by inverting calibrated teleseismic P 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.