Bulletin of the Seismological Society of America
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Bulletin of the Seismological Society of America; August 2009; v. 99; no. 4; p. 2305-2322; DOI: 10.1785/0120080165
© 2009 Seismological Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Pulido, N.
Right arrow Articles by Dalguer, L. A.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Estimation of the High-Frequency Radiation of the 2000 Tottori (Japan) Earthquake Based on a Dynamic Model of Fault Rupture: Application to the Strong Ground Motion Simulation

Nelson Pulido

National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan nelson{at}bosai.go.jp

Luis A. Dalguer

Institute of Geophysics, ETH-Zurich, Switzerland

In the present study we investigate the high-frequency (HF) radiation mechanism of the 2000 Tottori earthquake in Japan based on a 3D spontaneous fault rupture dynamic model. We generalize the model of HF radiation of a suddenly stopping circular crack (Madariaga, 1977; Boatwright, 1982) to the radiation from a general 3D rupture in a planar fault, where HF is radiated during gradual changes of rupture velocity at the rupture front. Local rupture velocity changes are expressed as the divergence of local rupture velocity vectors that are derived from gradients of rupture times from the dynamic model. Our numerical model of the Tottori earthquake indicates that rupture velocity changes are largely induced by barriers (locally stronger fault sections) across the fault plane and that HF radiation mainly originates within asperities (large stress-drop regions) in areas where the product of dynamic stress drop and rupture velocity changes is maximum. We develop a strong ground motion simulation methodology that incorporates HF radiation inferred from a dynamic fault rupture model. Using this methodology we investigate the HF radiation of the Tottori earthquake by inverting observed near-source acceleration envelopes of the earthquake. Our inversion results corroborate that HF radiation originates within asperities and show that significant HF radiation represents no more than a 20% of the total asperity area. Our results show that the incorporation of a directivity factor, on the basis of a well-defined physical rupture model to the radiation pattern leads to a significant improvement in fitting of observed ground motions. Our simulated near-source strong ground motions of the Tottori earthquake are also able to reproduce the {omega}-2 radiation theoretically predicted in 2D dynamic fault rupture models.




This article has been cited by other articles:


Home page
 Bulletin of the Seismological Society of AmericaHome page
W. Suzuki, S. Aoi, and H. Sekiguchi
Rupture Process of the 2008 Iwate-Miyagi Nairiku, Japan, Earthquake Derived from Near-Source Strong-Motion Records
Bulletin of the Seismological Society of America, February 1, 2010; 100(1): 256 - 266.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by the Seismological Society of America.