D
Donald V. Helmberger
Researcher at California Institute of Technology
Publications - 239
Citations - 14866
Donald V. Helmberger is an academic researcher from California Institute of Technology. The author has contributed to research in topics: Seismogram & Mantle (geology). The author has an hindex of 62, co-authored 238 publications receiving 13920 citations. Previous affiliations of Donald V. Helmberger include Planetary Science Institute.
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The 2011 Magnitude 9.0 Tohoku-Oki Earthquake: Mosaicking the Megathrust from Seconds to Centuries
Mark Simons,Sarah E. Minson,Anthony Sladen,Anthony Sladen,F. Ortega,Junle Jiang,Susan Owen,Lingsen Meng,Jean-Paul Ampuero,Shengji Wei,Risheng Chu,Donald V. Helmberger,Hiroo Kanamori,Eric A. Hetland,Angelyn Moore,Frank Webb +15 more
TL;DR: Detailed geophysical measurements reveal features of the 2011 Tohoku-Oki megathrust earthquake and suggest the need to consider the potential for a future large earthquake just south of this event.
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Rupture Process of the 2004 Sumatra-Andaman Earthquake
Charles J. Ammon,Chen Ji,Hong-Kie Thio,David Robinson,Sidao Ni,Sidao Ni,Vala Hjörleifsdóttir,Hiroo Kanamori,Thorne Lay,Shamita Das,Donald V. Helmberger,Gene A. Ichinose,Jascha Polet,David J. Wald +13 more
TL;DR: The 26 December 2004 Sumatra-Andaman earthquake initiated slowly, with small slip and a slow rupture speed for the first 40 to 60 seconds, then the rupture expanded at a speed of about 2.5 kilometers per second toward the north northwest, extending 1200 to 1300 kilometers along the Andaman trough as discussed by the authors.
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Source Description of the 1999 Hector Mine, California, Earthquake, Part I: Wavelet Domain Inversion Theory and Resolution Analysis
TL;DR: In this article, a joint inversion of static and seismic data is used for the determination of rupture complexity from a joint estimation of seismic data and synthetic seismic data, where the objective function is defined as the weighted sum of these functions.
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A Procedure for Modelling Shallow Dislocation Sources
TL;DR: In this article, generalized ray expansions are used to generate waveforms for shallow events as recorded at teleseismic distances for realistic earth models for various assumptions of stress-drop.
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Advancement in source estimation techniques using broadband regional seismograms
Lupei Zhu,Donald V. Helmberger +1 more
TL;DR: In this article, the amplitude difference between various phases (such as Pnl/surface wave, SV/SH) was removed by removing this type of normalization, which increased the stability and resolution of inversion.