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Accueil du site > Pages personnelles > Sébastien Hok

Post doc ANR

Sébastien Hok

Tel : (+33) 1 44 32 22 13

Sebastien_Hok

NEWS I recently moved to IRSN

Post-doc CNRS under projet ANR DYN-TOHOKU

Office E210 (building location on G-map or download access map)

e-Mail (mind the @_@)

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Interesting links

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Real-time Japanese seismicity from NIED website  : 24h hypocenter map, real-time instrumental intensity & acceleration at surface and borehole Kik-net and K-net stations (the last 60 minutes), latest focal mechanism from Aqua (see hi-net page for older ones).

Not yet in english, but rather intuitive. Here is the google translation in french .


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HI-NET website is now in ENGLISH !


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Sciencescope est une association de chercheurs et d’étudiants francophones au Japon dont j’ai fait partie. Leur site est une mine d’informations utiles, d’actualités, et l’association possède un réseau de contacts très utile.


Research

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Topics of interest

  • Earthquake Modeling :
    • dynamic rupture,
    • kinematic rupture,
    • wave propagation…
  • Earthquake Observations :
    • seismotectonics,
    • strong motion inversion,
    • geodesy,
    • crustal stress field…
  • Earthquake Physics :
    • friction experiments,
    • energy balance,
    • off-fault damage…
  • Tectonophysics :
    • crustal deformation,
    • subduction wedges,
    • fault networks,
    • fault surface characteristics…
  • Seismic Hazards :
    • paleoseismology,
    • seismic cycle modeling,
    • seismic hazard assessment,
    • precursors…

Research at ENS (with R.Madariaga, in collaboration with E.Fukuyama, H.Aochi and S.Ide)

DYN-TOHOKU project is dedicated to the Mw9 Tohoku-oki earthquake that occured on 11/03/2011 along the japan-pacific subduction zone. This earthquake exhibits some particularities such as a very large slip close to the trench, and an apparent complexity in the rupture propagation. In addition, a large number of observations are available to support the modeling of the rupture process. Therefore, we are developing spontaneous rupture models that take into account the slab geometry, a structural complexity in the overriding wedge, and the free surface. Dynamic inversion and inversion of cGPS data are also a target of this project.

Previous Research Topics

- 2008-2011 :

I developed a dynamic rupture code using the Boundary Integral Equations Method suitable to compute the rupture dynamics of earthquakes occurring on shallow faults with (almost) any 3D geometries. This model allowed us to study the dynamics of the 2008 Mw6.9 Iwate-Miyagi-Nairiku Earthquake, an inland thrust-fault earthquake, famous for being responsible for a 4g acceleration record, that might have been directly caused by the sudden change of rupture propagation velocity, as shown by our models. The new code also allowed us to compute various rupture scenarios for the Nankai-Tonankai subduction zone, showing that we could anticipate different kind of giant megathrust earthquake in this area. Which scenario is most probable is likely to be impossible to determine, if our assumption of a conditional barrier is true, since the final rupture size is conditioned by the rupture history (e.g. epicenter location determines whether the barrier can break or not).

This work was done at NIED, in Tsukuba, Japan, in the team of E.Fukuyama.

-2004-2008 :

In my PhD thesis, I studied problems related to earthquake rupture arrest. I focused on dynamic off-fault damaging during the propagation of the rupture along the fault surface, and the effect of multiple size of barriers along the fault plane.

This work was done at LGIT, in Grenoble, France, under the supervision of M.Campillo and F.Cotton.


Teaching

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I was an assistant lecturer during 3 years at OSUG (2004-2007).

I taught
- exercise classes (TD) of source seismology to Master 1st year students,
- field classes (TE) of geological cartography and structural geology to Licence 3 students.
- practical classes (TP) of geological cartography to Licence 3 students (teacher exam preparation - CAPES).


Publications

bandeau_seconde12_590p Contact me for e-reprints

- 2013 :

- The effect of thermal pressurization on dynamic fault branching

Yumi Urata, Sébastien Hok, Eiichi Fukuyama and Raul Madariaga

accepted in Geophysical Journal International

- Dynamic Overshoot near Trench Caused by Large Asperity Break at Depth

Eiichi Fukuyama and Sébastien Hok

accepted in Pure and Applied Geophysics

- 2011 :

- Dynamic rupture scenarios of anticipated Nankai-Tonankai earthquakes, southwest Japan

Sébastien Hok, Eiichi Fukuyama and Chihiro Hashimoto

J. Geophys. Res., Vol. 116, No. B12, B12319, doi:10.1029/2011JB008492, 30 December 2011

- A new BIEM for rupture dynamics in half-space and its application to the 2008 Iwate-Miyagi Nairiku earthquake

Sébastien Hok and Eiichi Fukuyama

Geophys. J. Int., 184, 301-324, doi:10.1111/j.1365-246X.2010.04835.x, 11 January 2011

- 2010 :

- Off-fault plasticity favors the arrest of dynamic ruptures on strength heterogeneity : Two-dimensional cases

Sébastien Hok, Michel Campillo, Fabrice Cotton, Pascal Favreau and Ioan Ionescu

Geoph. Res. Lett., Vol. 37, L02306, doi:10.1029/2009GL041888, 30 January 2010


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