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Source model of the 16 September 2015 Illapel, Chile, M w 8.4 earthquake based on teleseismic and tsunami data
Author(s) -
Heidarzadeh Mohammad,
Murotani Satoko,
Satake Kenji,
Ishibe Takeo,
Gusman Aditya Riadi
Publication year - 2016
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 - 10.1002/2015gl067297
Subject(s) - epicenter , seismology , geology , aftershock , slip (aerodynamics) , moment magnitude scale , seismic moment , fault (geology) , physics , geometry , mathematics , scaling , thermodynamics
We proposed a source model for the 16 September 2015 Illapel (Chile) tsunamigenic earthquake using teleseismic and tsunami data. The 2015 epicenter was at the northernmost of the aftershocks zone of the 2010 M w 8.8 Maule earthquake. Teleseismic body wave inversions and tsunami simulations showed optimum rupture velocities of 1.5–2.0 km/s. The agreement between observed and synthetic waveforms was quantified using normalized root‐mean‐square (NRMS) misfit. The variations of NRMS misfits were larger for tsunami data compared to the teleseismic data, because tsunami waveforms are more sensitive to the spatial distribution of slip. The large‐slip area was 80 km (along strike) × 100 km (along dip) with an average slip of 5.0 m and depth of 12–33 km, located ~70 km to the northwest of the epicenter. We obtained a seismic moment of 4.42 × 10 21 Nm equivalent to M w 8.4. Results may indicate a northward stress transfer from the 2010 Maule earthquake.