Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/12332
Authors: Romano, Fabrizio* 
Piatanesi, Alessio* 
Lorito, Stefano* 
Tolomei, Cristiano* 
Atzori, Simone* 
Murphy, S.* 
Title: Optimal time alignment of tide-gauge tsunami waveforms in nonlinear inversions: Application to the 2015 Illapel (Chile) earthquake
Journal: Geophysical Research Letters 
Series/Report no.: /43 (2016)
Issue Date: 2016
DOI: 10.1002/2016GL071310
Abstract: 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-gauge 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 interferometric synthetic aperture radar data for the slip distribution of the 2015 Mw 8.3 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.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat
Romano_GRL_2016.pdf2.38 MBAdobe PDFView/Open
Show full item record

WEB OF SCIENCETM
Citations 50

12
checked on Feb 10, 2021

Page view(s)

251
checked on Mar 27, 2024

Download(s)

99
checked on Mar 27, 2024

Google ScholarTM

Check

Altmetric