Geophyiscal Research Letters
1. 3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary
Genyang Tang(1,8),
Penny J. Barton(1),
Lisa C. McNeill(2),
Timothy J. Henstock(2),
Frederik Tilmann(1,3),
Simon M. Dean(2),
Muhammad D. Jusuf(4),
Yusuf S. Djajadihardja(4),
Haryadi Permana(5),
Frauke Klingelhoefer(6),
Heidrun Kopp(7)
(1) Bullard Laboratories, University of Cambridge
(2) National Oceanography Centre Southampton, University of Southampton, UK
(3) GFZ German Research Centre for Geosciences, Germany
(4) Agency for the Assessment and Application of Technology (BPPT), Jakarta, Indonesia
(5) Indonesian Institute of Sciences (LIPI), Bandung, Indonesia
(6) IFREMER, Plouzané, France
(7) GEOMAR Helmholtz-Centre for Ocean Sciences Kiel, Germany
(8) State Key Laboratory of Petroleum Resource and Prospecting, China.
- 3-D P-wave velocity model obtained by first-arrival travel-time tomography with seismic refraction data
- image of the top of the subducted oceanic crust extracted from depth-migrated multi-channel seismic reflection profiles.
- picked P-wave first arrivals of the air-gun source seismic data recorded by local networks of ocean-bottom seismometers
2.Earthquake source parameters from GPS-measured static displacements with potential for real-time application
Thomas B. O'Toole(1), Andrew P(2). Valentine, John H. WoodhousE(1)
(1) Department of Earth Sciences, University of Oxford, Oxford, UK
(2) Department of Earth Sciences, Universiteit Utrecht, Utrecht, The Netherlands
- Determine an optimal centroid–moment tensor solution of an earthquake from a set of static displacements measured using a network of Global Positioning System receivers.
- It allows the inversion to be performed in real-time on a single processor without the need for precomputed libraries of excitation kernel
3.The role of Coulomb stress changes for injection-induced seismicity: The Basel enhanced geothermal system
Flaminia Catalli, Men-Andrin Meier, Stefan Wiemer
Swiss Seismological Service, Institute of Geophysics, ETH Zuerich, Switzerland
- We find that ΔCFS are highly sensitive to location accuracy but robust with regard to uncertainties of the other parameters.
- the Coulomb model may complement conventional pore-pressure triggering models
- implementing it may improve the forecasting ability but will require highly accurate hypocenter estimates.
4. Deformation at depth associated with the 12 May 2008 MW 7.9 Wenchuan earthquake from seismic ambient noise monitoring
B. Froment(1,2),
M. Campillo(1),
J.H. Chen(3),
Q.Y. Liu(3)
(1) ISTerre, Universite de Grenoble, France.
(2) Now at the Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, USA.
(3) State Key Laboratory of Earthquake Dynamics, China Earthquake Administration, Beijing, China.
- By comparison with measurements in the band 1-3 s, It is shown that the seismic velocity changes cannot be explained by a shallow perturbation but are related to deformation at depth in the crust.
- Results suggest that the deformation in the middle crust is different beneath Tibet and the Sichuan basin.
5. Effect of the largest foreshock (Mw 7.3) on triggering the 2011 Tohoku earthquake (Mw 9.0)
Aditya Riadi Gusman(1),
Mitsuteru Fukuoka(1),
Yuichiro Tanioka(1),
Shin'ichi Sakai(2).
(1). Institute of Seismology and Volcanology, Hokkaido University
(2). Earthquake Research Institute, University of Tokyo
- The slip distribution of the largest foreshock of the 2011 Tohoku earthquake is estimated by tsunami waveform inversion.
- The 2011 Tohoku earthquake was brought closer to failure by the largest foreshock.