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Title: | Fault slip distribution of the 2014 Iquique, Chile, earthquake estimated from ocean-wide tsunami waveforms and GPS data |
Authors: | Gusman, AR Murotani, S Satake, K Heidarzadeh, M Gunawan, E Watada, S Schurr, B |
Keywords: | earthquake rupture process;Chile earthquakes;the 2014 Iquique earthquake;far-field tsunami waveforms;tsunami delay correction;joint inversion |
Issue Date: | 24-Jan-2015 |
Publisher: | Wiley on behalf of American Geophysical Union |
Citation: | Gusman, A.R., Murotani, S., Satake, K., Heidarzadeh, M., Gunawan, E., Watada, S. and Schurr, B. (2015) 'Fault slip distribution of the 2014 Iquique, Chile, earthquake estimated from ocean-wide tsunami waveforms and GPS data', Geophysical Research Letters, 2015, 42 (4), pp. 1053 - 1060 (8). doi: 10.1002/2014GL062604. |
Abstract: | We applied a new method to compute tsunami Green’s functions for slip inversion of the 1 April 2014 Iquique earthquake using both near-field and far-field tsunami waveforms. Inclusion of the effects of the elastic loading of seafloor, compressibility of seawater, and the geopotential variation in the computed Green’s functions reproduced the tsunami travel-time delay relative to long-wave simulation, and allowed us to use far-field records in tsunami waveform inversion. Multiple time window inversion was applied to tsunami waveforms iteratively until the result resembles the stable moment-rate function from teleseismic inversion. We also used GPS data for a joint inversion of tsunami waveforms and co-seismic crustal deformation. The major slip region with a size of 100 km × 40 km is located down-dip the epicenter at depth ~28 km, regardless of assumed rupture velocities. The total seismic moment estimated from the slip distribution is 1.24 × 1021 Nm (Mw 8.0). |
URI: | https://bura.brunel.ac.uk/handle/2438/14914 |
DOI: | https://doi.org/10.1002/2014GL062604 |
ISSN: | 0094-8276 |
Appears in Collections: | Dept of Life Sciences Research Papers |
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