Publication Date:
2016-10-27
Description:
Tsunami waveform inversion is often used to retrieve information about the causative seismic tsunami source. Tide-gauges record tsunamis routinely; however, compared to deep-ocean sensor data, tide-gauge waveform modeling is more difficult due to coarse/inaccurate local bathymetric models resulting in a time mismatch between observed and predicted waveforms. This can affect the retrieved tsunami source model, thus limiting the use of tide-gauges data. A method for nonlinear inversion with an automatic optimal time-alignment (OTA), calculated by including a time shift parameter in the cost function, is presented. The effectiveness of the method is demonstrated through a series of synthetic tests and is applied as part of a joint inversion with InSAR data for the slip distribution of the 2015 Mw8.3 Illapel earthquake. The results show that without OTA the resolution on the slip model degrades significantly and that using this method for a real case strongly affects the retrieved slip pattern.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
