Rupture process of the 2016 Wharton Basin strike‐slip faulting earthquake estimated from joint inversion of teleseismic and tsunami waveforms

The 2016 Wharton Basin strike‐slip faulting earthquake generated a small tsunami that was clearly recorded at deep ocean stations. Teleseismic inversions were made on four different nodal planes suggested by Global Centroid Moment Tensor and W‐phase solutions. Tsunami waveforms computed for the nort...

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Bibliographic Details
Published in:Geophysical research letters 2017-05, Vol.44 (9), p.4082-4089
Main Authors: Gusman, Aditya Riadi, Satake, Kenji, Harada, Tomoya
Format: Article
Language:English
Subjects:
Analysis
Computation
Data
Data processing
Datasets
Depth
Dipping
Earthquakes
Geological faults
Inversion
Inversions
joint inversion
kinematic rupture model
Kinematics
Mathematical models
Ocean stations
Planes
Rupture
Rupturing
Slip
Solutions
Strike-slip faults
strike‐slip faulting earthquake
teleseismic and tsunami waveforms
the 2016 Wharton Basin earthquake
tsunami simulation
Tsunamis
Waveforms
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Summary:The 2016 Wharton Basin strike‐slip faulting earthquake generated a small tsunami that was clearly recorded at deep ocean stations. Teleseismic inversions were made on four different nodal planes suggested by Global Centroid Moment Tensor and W‐phase solutions. Tsunami waveforms computed for the north‐south striking westward dipping plane were most similar to the observations. With this fault plane, joint inversions of teleseismic and tsunami waveforms were used to estimate the kinematic rupture process. The weights of teleseismic and tsunami waveforms were found to make both data sets equally contribute to the solution. Misfit analysis of both data sets favored a rupture model with rupture front speed of 2.0 km/s. The seismic moment was estimated to be 7.69 × 1020 Nm (Mw 7.9), most of it was released within 30 s and it peaked at 15 s. Subfaults with slip larger than 5 m were located from near surface to 30 km depth. Key Points Joint inversion of teleseismic and tsunami indicates that the 2016 Wharton Basin earthquake ruptured on a NS striking westward dipping plane The kinematic rupture model with rupture front speed of 2.0 km/s produces good fits to both teleseismic and tsunami waveforms The major slip region with slip amount up to 9 m is located from near surface to 30 km depth
ISSN:0094-8276
1944-8007
DOI:10.1002/2017GL073611