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A dynamic model of the frequency-dependent rupture process of the 2011 Tohoku-Oki earthquake

Huang, Yihe and Meng, Lingsen and Ampuero, Jean-Paul (2013) A dynamic model of the frequency-dependent rupture process of the 2011 Tohoku-Oki earthquake. Earth Planets and Space, 64 (12). pp. 1061-1066. ISSN 1343-8832. doi:10.5047/eps.2012.05.011.

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We present a 2D dynamic rupture model that provides a physical interpretation of the key features of the 2011 Tohoku-Oki earthquake rupture. This minimalistic model assumes linear slip-weakening friction, the presence of deep asperities and depth-dependent initial stresses. It reproduces the first-order observations of the along-dip rupture process during its initial 100 s, such as large static slip and low-frequency radiation up-dip from the hypocenter, and slow rupture punctuated by high-frequency radiation in deeper regions. We also derive quantitative constraints on the ratio of shallow versus deep radiation from teleseismic back-projection source imaging. This ratio is explained in our model by the rupture of deep asperities surrounded by low stress drop regions, and by the decrease of initial stresses towards the trench.

Item Type:Article
Related URLs:
URLURL TypeDescription
Meng, Lingsen0000-0003-2428-0548
Ampuero, Jean-Paul0000-0002-4827-7987
Additional Information:© 2013 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 December 27, 2011; Revised May 7, 2012; Accepted May 17, 2012; Online published January 28, 2013. This work was supported by NSF grants EAR-0944288 and EAR-1015704, the Gordon and Betty Moore Foundation and SCEC (funded by NSF EAR-0106924 and USGS 02HQAG0008 cooperative agreements). We thank Wenbo Wu for generating the Green’s functions for our synthetic tests, and Surendra Somala for generating the meshes for our dynamic rupture simulations.
Group:Seismological Laboratory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:Dynamic rupture model; Tohoku earthquake; back projection; high-frequency radiation; deep asperities
Issue or Number:12
Record Number:CaltechAUTHORS:20130308-074929497
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37399
Deposited By: Tony Diaz
Deposited On:15 Apr 2013 18:58
Last Modified:09 Nov 2021 23:28

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