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Supershear rupture in the 24 May 2013 M w 6.7 Okhotsk deep earthquake: Additional evidence from regional seismic stations
Author(s) -
Zhan Zhongwen,
Shearer Peter M.,
Kanamori Hiroo
Publication year - 2015
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 - 10.1002/2015gl065446
Subject(s) - seismology , geology , aftershock , deconvolution , inversion (geology) , seismic moment , geodesy , fault (geology) , algorithm , mathematics , tectonics
Zhan et al. (2014a) reported supershear rupture during the M w 6.7 aftershock of the 2013 M w 8.3 Sea of Okhotsk deep earthquake, relying heavily on the regional station PET, which played a critical role in constraining the vertical rupture dimension and rupture speed. Here we include five more regional stations and find that the durations of the source time functions derived from these stations are consistent with Zhan et al.'s supershear rupture model. Furthermore, to reduce the nonuniqueness of deconvolution and combine the bandwidths of different stations, we conduct a joint inversion of the six regional stations for a single broadband moment‐rate function (MRF). The best fitting MRF, which explains all the regional waveforms well, has a smooth shape without any temporal gaps. The M w 6.7 Okhotsk deep earthquake is more likely a continuous supershear rupture than a dynamically triggered doublet.