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The 2011 M_w 9.0 off the Pacific coast of Tohoku Earthquake: Comparison of deep-water tsunami signals with finite-fault rupture model predictions

Lay, Thorne and Yamazaki, Yoshiki and Ammon, Charles J. and Cheung, Kwok Fai and Kanamori, Hiroo (2011) The 2011 M_w 9.0 off the Pacific coast of Tohoku Earthquake: Comparison of deep-water tsunami signals with finite-fault rupture model predictions. Earth Planets and Space, 63 (7). pp. 797-801. ISSN 1343-8832.

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Finite-source rupture models for the great 11 March 2011 off the Pacific coast of Tohoku (M_w 9.0) Earthquake obtained by inversions of seismic waves and geodetic observations are used to reconstruct deep-water tsunami recordings from DART buoys near Japan. One model is from least-squares inversion of teleseismic P waves, and another from iterative least-squares search-based joint inversion of teleseismic P waves, short-arc Rayleigh wave relative source time functions, and high-rate GPS observations from northern Honshu. These rupture model inversions impose similar kinematic constraints on the rupture growth, and both have concentrations of slip of up to 42 m up-dip from the hypocenter, with substantial slip extending to the trench. Tsunami surface elevations were computed using the model NEOWAVE, which includes a vertical momentum equation and a non-hydrostatic pressure term in the nonlinear shallow-water equations to account for the time-history of seafloor deformation and propagation of weakly dispersive tsunami waves. Kinematic seafloor deformations were computed using the Okada solutions for the rupture models. Good matches to the tsunami arrival times and waveforms are achieved for the DART recordings for models with slip extending all the way to the trench, whereas shifting fault slip toward the coast degrades the predictions.

Item Type:Article
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URLURL TypeDescription DOIArticle
Lay, Thorne0000-0003-2360-4213
Cheung, Kwok Fai0000-0002-7435-0500
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2011 The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. Received April 7, 2011; Revised May 20, 2011; Accepted May 22, 2011; Online published September 27, 2011. This work made use of GMT, SAC and Matlab software. The IRIS DMS data center was used to access the seismic data. Continuous GPS data processed with 30 s sampling were provided by the ARIA team at JPL and Caltech courtesy of Susan Owen. The recorded DART buoy data were obtained from the NOAA National Data Buoy Center. We thank Y. Tanioka and S. Lorito for helpful reviews of the manuscript. This work was supported by NSF grant EAR0635570 and USGS Award Number 05HQGR0174.
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Subject Keywords:Great earthquakes; DART buoys; tsunami; finite-fault models; 2011 Tohoku Earthquake
Issue or Number:7
Record Number:CaltechAUTHORS:20120105-143019254
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28682
Deposited By: Tony Diaz
Deposited On:06 Jan 2012 16:40
Last Modified:03 Oct 2019 03:34

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