Deep structure of the northeastern Japan arc and its implications for crustal deformation and shallow seismic activity

2005 ◽  
Vol 403 (1-4) ◽  
pp. 59-75 ◽  
Author(s):  
Akira Hasegawa ◽  
Junichi Nakajima ◽  
Norihito Umino ◽  
Satoshi Miura
Keyword(s):  
Crustal Deformation ◽  
Seismic Activity ◽  
Deep Structure ◽  
Shallow Seismic ◽  
Northeastern Japan

scholarly journals Crustal Deformation and Shallow Seismic Activity beneath the Northeastern Japan Arc

2004 ◽  
Vol 56 (4) ◽  
pp. 413-424
Author(s):  
Akira HASEGAWA ◽  
Junichi NAKAJIMA ◽  
Norihito UMINO ◽  
Satoshi MIURA ◽  
Yoko SUWA
Keyword(s):  
Crustal Deformation ◽  
Seismic Activity ◽  
Shallow Seismic ◽  
Northeastern Japan

scholarly journals The Hindu Kush slab break-off as revealed by deep structure and crustal deformation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sofia-Katerina Kufner ◽  
Najibullah Kakar ◽  
Maximiliano Bezada ◽  
Wasja Bloch ◽  
Sabrina Metzger ◽  
...  
Keyword(s):  
Real Time ◽  
Penetration Depth ◽  
Continental Crust ◽  
Crustal Deformation ◽  
Deep Structure ◽  
Continental Collision ◽  
Variable Degree ◽  
Finite Frequency ◽  
Hindu Kush ◽  
Short Times

AbstractBreak-off of part of the down-going plate during continental collision occurs due to tensile stresses built-up between the deep and shallow slab, for which buoyancy is increased because of continental-crust subduction. Break-off governs the subsequent orogenic evolution but real-time observations are rare as it happens over geologically short times. Here we present a finite-frequency tomography, based on jointly inverted local and remote earthquakes, for the Hindu Kush in Afghanistan, where slab break-off is ongoing. We interpret our results as crustal subduction on top of a northwards-subducting Indian lithospheric slab, whose penetration depth increases along-strike while thinning and steepening. This implies that break-off is propagating laterally and that the highest lithospheric stretching rates occur during the final pinching-off. In the Hindu Kush crust, earthquakes and geodetic data show a transition from focused to distributed deformation, which we relate to a variable degree of crust-mantle coupling presumably associated with break-off at depth.

scholarly journals GPS crustal deformation, strain rate, and seismic activity after the 1999 Chi-Chi earthquake in Taiwan

2010 ◽  
Vol 115 (B7) ◽  
Author(s):  
Kuan-Chuan Lin ◽  
Jyr-Ching Hu ◽  
Kuo-En Ching ◽  
Jacques Angelier ◽  
Ruey-Juin Rau ◽  
...  
Keyword(s):  
Strain Rate ◽  
Crustal Deformation ◽  
Seismic Activity ◽  
Deformation Strain ◽  
Deformation Strain Rate

Seismic Activity in the Northeastern Japan Arc

1978 ◽  
pp. 95-104 ◽  
Author(s):  
Akio Takagi ◽  
Akira Hasegawa ◽  
Norihito Umino
Keyword(s):  
Seismic Activity ◽  
Northeastern Japan

Inelastic strain rate and stress fields in and around an aseismic zone of Kyushu Island, Japan, inferred from seismic and GNSS data

2020 ◽  
Vol 221 (1) ◽  
pp. 289-304
Author(s):  
Y Yuasa ◽  
S Matsumoto ◽  
S Nakao ◽  
T Matsushima ◽  
T Ohkura
Keyword(s):  
Stress Concentration ◽  
Strain Rate ◽  
Crustal Deformation ◽  
Lower Crust ◽  
Seismic Activity ◽  
Deformation Zone ◽  
Inelastic Deformation ◽  
Upper Crust ◽  
Localized Deformation ◽  
Concentration Process

SUMMARY Understanding earthquake processes and crustal deformation requires knowledge of the stress concentration process in the crust. With the enhancement of observation networks, it has become possible to consider in detail the relationships between localized deformation and seismic activity in island arcs and the process of stress concentration. According to previous studies, inelastic deformation in localized weak zones in the crust is considered to play an important role in the stress concentration process. Kyushu, located in southwest Japan, has a 20–30 km band-like active seismic activity and an enclosed aseismic zone. In particular, a part of the seismic active region called the Beppu-Simahara Graben, which is dominated by north–south extensional deformation, is characterized by high seismic activity and a remarkable aseismic zone. We identified the relationship between inelastic deformation and stress concentration processes in this area by using analyses of geodetic and seismic data. The results inverted from both the strain rate field obtained by the geodetic observations and the deviatoric stress field estimated from focal mechanism data reveal a large inelastic deformation zone ($\sim {10^{ - 7}} \,\mathrm{ yr}^{-1}$) beneath the area of active seismicity. From comparison with previous works, the inelastic deformation zone in the lower crust may correspond to an area with high temperature and/or fluid. This may suggest that inelastic deformation is in progress in the area where the strength of lower crustal rocks has reduced due to the presence of geothermics and/or fluids. Furthermore, we confirmed that this inelastic deformation causes stress concentrations of up to $10\,\,{\rm{kPa}}\,\,{\rm{yr}}^{-1}$ in the upper crust. These results show that stress concentration occurs locally in the upper crust, above the inelastic deformation zone in the weakened lower crust, owing to the presence of geothermal and/or fluid; this stress concentration induces seismic activity and crustal deformation.

scholarly journals Crustal Deformation of South Korea After the Tohoku-Oki Earthquake: Deformation Heterogeneity and Seismic Activity

Tectonics ◽  
2018 ◽  
Vol 37 (8) ◽  
pp. 2389-2403 ◽  
Author(s):  
Sungshil Kim ◽  
Jin-Han Ree ◽  
Ha Su Yoon ◽  
Byung-Kyu Choi ◽  
Pil-Ho Park
Keyword(s):  
South Korea ◽  
Crustal Deformation ◽  
Seismic Activity
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