Velocity field for crustal deformation in China derived from seismic moment tensor summation of earthquakes

Qin, Changyuan; Papazachos, C. B.; Papadimitriou, Eleftheria

doi:10.1016/s0040-1951(02)00401-8

Cited by 18 publications

(12 citation statements)

References 49 publications

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“…As the tectonic map indicates (see Figure 1a), the Chinese mainland and its surrounding area are located in the southeastern part of the Eurasian plate bounded by the Indian, the Philippine Sea and the Pacific plates. The region is characterized by strong northeastward motion of the Indian plate with respect to southwestern China, by the westward subduction of the Pacific plate beneath eastern China, and by the northwestward impact of the Philippine Sea plate (Molnar and Tapponier, 1975;Teng et al, 1979;Zhou et al, 1998;Wang et al, 2001;Qin et al, 2002). The study area can be broadly divided into a western part and an eastern part along 105 • E longitude (see Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Double-difference relocation of earthquakes in central-western China, 1992–1999

et al. 2005

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The double-difference earthquake location algorithm was applied to the relocation of 10,057 earthquakes that occurred in central-western China (21 • N to 36 • N, 98 • E to 111 • E) during the period from 1992 to 1999. In total, 79,706 readings for P waves and 72,169 readings for S waves were used in the relocation. The relocated seismicity (6,496 earthquakes) images fault structures at seismogenic depths that are in close correlation with the tectonic structure of major fault systems expressed at the surface. The new focal depths confirm that most earthquakes (91%) in this region occur at depths less than 20 km.

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Section: Introductionmentioning

confidence: 99%

Double-difference relocation of earthquakes in central-western China, 1992–1999

et al. 2005

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“…Slip rates of the major faults in the study area are adopted from various researchers who investigated geologic, geodetic and geomorphologic information or velocity field of crustal motion in China (Chen et al, 2000;Holt et al, 2002;Qin et al, 2002). In central China major fault zones exist, such as Altay fault, trending east-west where large displacements of the order of thousands meters have been identified.…”

Section: Fault Segmentation and Long-term Slip Rate Constraintmentioning

confidence: 99%

Implication of fault interaction to seismic hazard assessment in Sichuan-Yunnan provinces of southeastern China

et al. 2008

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Coulomb stress changes associated with the strong earthquakes that occurred since 1904 in Sichuan and Yunnan provinces of China are investigated. The study area comprises the most active seismic fault zones in the Chinese mainland and suffers from both strong and frequent events. The tectonic regime of this rhombic-shaped area is affected by the eastern extrusion of the Tibetan highland due to the collision of Eurasian Plate against the Indian lithospheric block along the Himalayan convergent zone. This movement is accommodated on major strike-slip intraplate fault zones that strike in an E-W direction. The gradual 90° clockwise rotation of the faults in the study area contributes to the complexity of the stress field. The seismic hazard assessment in this region is attempted by calculating the change of the Coulomb Failure Function ( CFF) arising from both the coseismic slip of strong events (M S ≥6.5) and the stress built-up by continuous tectonic loading on major regional faults. At every step of the stress evolutionary model an examination of possible triggering of each next strong event is made and the model finally puts in evidence the fault segments that apt to fail in an impending strong event, thus providing future seismic hazard evaluation.

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“…The compressive tectonic force due to the collision along the Himalayas between the Indian and Eurasian plates results in orogenic motions in the Himalayas, Tibetan plateau, and Altyn and Qilian mountains [1,2]. Such violent crustal movements and frequent and strong earthquakes extend to the Tianshan Mountains [3,4]. The compressive tectonic force affects crustal motions in the west of China and as far as Mongolia [5,6].…”

Section: Introductionmentioning

confidence: 99%

Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau

Zhao

2009

International Journal of Geophysics

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Various earthquake fault types, mechanism solutions and stress fields, as well as GPS and geothermal data are analyzed for the study of the crustal movements on the Tibetan plateau and their tectonic implications. The results show that a lot of the normal faulting type-event concentrated at altitudes greater than 4000 m on the central Tibetan plateau. The altitudes concentrating normal faulting type-events can be zoned two parts: the western part, the Lhasa block, and the eastern part, the QiangtangChangdu region. The azimuths of T-axes are in a general E-W direction in the Lhasa block and NW-SE or NNW-SSE in the Qiangtang-Changdu region at the altitudes of the Tibetan plateau. The tensional stresses in E-W direction and NW-SE direction predominate normal faulting earthquake occurrence in the Lhasa block and the Qiangtang-Changdu region, respectively. The slipping displacements of the normal-faulting-type events have great components in near E-W direction and NW-SE direction in the Lhasa block and the Qiangtang-Changdu region, respectively. The extensions are probably an eastward or southeastward extensional motion, being mainly tectonic activity phenomena in the plateau altitudes. The extensional motions due to normalfault earthquakes are important tectonic activity regimes on the high altitudes of the plateau. The easterly crustal extensions on the plateau are attributable to the gravitational collapse of the high plateau and eastward extrusion of hotter mantle materials beneath the eastern boundary of the plateau. Numbers of thrust-fault and strike-slip-fault earthquakes with strong compressive stress in a general NNE-SSW direction occur on the edges of the plateau.

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Velocity field for crustal deformation in China derived from seismic moment tensor summation of earthquakes

Cited by 18 publications

References 49 publications

Double-difference relocation of earthquakes in central-western China, 1992–1999

Double-difference relocation of earthquakes in central-western China, 1992–1999

Implication of fault interaction to seismic hazard assessment in Sichuan-Yunnan provinces of southeastern China

Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau

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